Weekly Propagation Forecast Bulletins

 :Product: Weekly Highlights and Forecasts

:Issued: 2026 Jul 27 0325 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#                Weekly Highlights and Forecasts

#

Highlights of Solar and Geomagnetic Activity

20 - 26 July 2026

Solar activity was at low to R1 (Minor) levels this period. A total

of 54 C-class and 6 R1 (Minor) events were observed. The largest,

and most complex spot group, was Region 4493 (N06, L=158, class/area

Eki/440 on 23 Jul). This region produced a total of 42 C-class and 5

M-class events, the largest an M3.6 at 22/0635 UTC. A 200 sfu 10 cm

Burst was associated with this event. Region 4494 (S04, L=088,

class/area Dac/120 on 26 Jul) produced the other R1 (Minor) event,

an M3.2 at 26/1528 UTC. Associated with this event was a Type II

Sweep with an estimated shock velocity of 1,057 km/s. No other

significant activity was observed. 

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at

high levels on 20 and 26 Jul with the high value of 1,300 pfu

observed at 20/1645 UTC. 

Geomagnetic field activity was at quiet to G1 (Minor) levels. Quiet

levels were observed on 20 Jul. Levels increased to unsettled to

active on 21 Jul to early on 24 Jul, with isolated G1 (Minor) levels

observed late on 23 Jul. This activity was due to effects from a

negative polarity CH HSS. Quiet conditions were observed most of 24

Jul and 25-26 Jul. 

Forecast of Solar and Geomagnetic Activity

27 July - 22 August 2026

Solar activity is expected to be at mostly low levels with a chance

for moderate R1 (Minor) levels throughout the outlook period. 

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is

expected to reach high levels on 27 Jul, 02-03 Aug, 06-09 Aug, 12-16

Aug, and 22 Aug. The remainder of the outlook period is expected to

be at normal to moderate levels. 

Geomagnetic field activity is expected to be at unsettled to active

levels on 27-28 Jul due to potential weak CME effects. Unsettled to

active levels are expected on 29-31 Jul, 04-07 Aug, 11-12 Aug, and

17-20 Aug with isolated G1 (Minor) levels possible on 19 Aug. This

level of activity is due to recurrent CH HSS effects. Mostly quiet

levels are expected for the remainder of the outlook period. 

Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 Jul 27 0325 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-07-27

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 Jul 27     150          18          4

2026 Jul 28     150          15          3

2026 Jul 29     145           8          3

2026 Jul 30     140           8          3

2026 Jul 31     135           8          3

2026 Aug 01     130           5          2

2026 Aug 02     125           5          2

2026 Aug 03     125           5          2

2026 Aug 04     125          12          4

2026 Aug 05     120          15          3

2026 Aug 06     125          10          3

2026 Aug 07     130           7          2

2026 Aug 08     130           5          2

2026 Aug 09     130           5          2

2026 Aug 10     135           5          2

2026 Aug 11     130           8          3

2026 Aug 12     125           8          3

2026 Aug 13     125           5          2

2026 Aug 14     130           5          2

2026 Aug 15     135           5          2

2026 Aug 16     135           4          2

2026 Aug 17     135          14          3

2026 Aug 18     140          12          3

2026 Aug 19     135          22          5

2026 Aug 20     135           8          3

2026 Aug 21     130           5          2

2026 Aug 22     130           5          2

(NOAA)

Weekly Propagation Forecast Bulletins, May 25, 2026

 Product: Weekly Highlights and Forecasts

:Issued: 2026 May 25 0601 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

Highlights of Solar and Geomagnetic Activity 18 - 24 May 2026

Solar activity ranged from low to moderate levels. The largest flare was an M2.3 (R1-Minor) at 22/1029 UTC from Region 4436 (N18, L=333, class/area Dai/200 on 13 May). The region was also responsible for a C8.3 and C9.5 flares on 21/1814 UTC and 21/1825 UTC, respectively. This region was then responsible for the majority of the C-class activity until its rotation off the W limb on 21 May. On 23-24 May, the majority of the C-class activity occurred from Region 4446 (S13, L=141, class/area Dko/280 on 24 May). No Earth-directed CMEs were observed during the period. 

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit reached high levels on 18-24 May due to CH HSS influences. The highest flux observed was 6,667 pfu at 18/1435 UTC. 

Geomagnetic field activity ranged from quiet to active levels. Solar wind parameters began the period in a slow decline from 560 km/s as negative polarity CH HSS effects gradually diminished. At 19/0630 UTC, a small shock was observed increasing total field to 7-8 nT while solar wind speed increased to near 625 km/s before beginning to decline once again. This was likely the glancing effects from a CME that left the Sun on 16 May. Solar wind speed continued to decrease to nominal levels through 22 May. The geomagnetic field reacted with quiet to active levels on 19 May. Quiet to unsettled levels were observed on 18 May and 20-22 May. Quiet conditions occurred on 23-24 May. 

Forecast of Solar and Geomagnetic Activity 25 May - 20 June 2026

Solar activity is expected to be at low to moderate levels (R1-R2, Minor-Moderate) on 25 May through 07 Jun with the return of old Region 4432 (N14, L=081). Mostly low levels with a chance for M-class flares is expected from 08-20 Jun. 

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 25-27 May and 12-20 Jun due to CH HSS influences. 

Geomagnetic field activity is expected to be at unsettled to active levels on 27-29 May, 04 Jun, 09 Jun, and 11-15 Jun due to recurrent CH HSS activity. G2 (Moderate) storm conditions are likely on 11 Jun

and G1 (Minor) storming on 12 Jun due to CIR/CH HSS onset. 

Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 May 25 0601 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-05-25

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 May 25     140           5          2

2026 May 26     145           8          3

2026 May 27     150          12          4

2026 May 28     140          12          4

2026 May 29     140           8          3

2026 May 30     145           5          2

2026 May 31     145           5          2

2026 Jun 01     145           5          2

2026 Jun 02     145           5          2

2026 Jun 03     150           5          2

2026 Jun 04     145          15          4

2026 Jun 05     140           5          2

2026 Jun 06     135           5          2

2026 Jun 07     135           5          2

2026 Jun 08     130           5          2

2026 Jun 09     125          12          4

2026 Jun 10     130           5          2

2026 Jun 11     130          30          6

2026 Jun 12     125          25          5

2026 Jun 13     120          12          4

2026 Jun 14     115          10          3

2026 Jun 15     115           8          3

2026 Jun 16     110           5          2

2026 Jun 17     110           5          2

2026 Jun 18     110           5          2

2026 Jun 19     115           5          2

2026 Jun 20     120           5          2

(NOAA)

Weekly Propagation Forecast Bulletins, May 18, 2026

 :Product: Weekly Highlights and Forecasts

:Issued: 2026 May 18 0431 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#                Weekly Highlights and Forecasts

#

Highlights of Solar and Geomagnetic Activity 11 - 17 May 2026

Solar activity reached moderate levels on 16 May due to four M-class flares. The largest were an M1.9/2N (R1-Minor) at 16/1612UTC from Region 4436 (N18, L=330, class/area=Dao/200 on 11 May) and a second

M1.9 flare (R1-Moderate) at 16/1742UTC from Region 4435 (N22, L=040, class/area=Dao/070 on 15 May). The 1612UTC M1.9 was associated with a Type IV radio sweep, two 10.7 cm radio bursts, and a filament

eruption that was centered at approximately N21W07, which lead to a complex CME signature in coronagraph imagery. The first front was first seen in LASCO C2 imagery at 16/1636UTC, and the second front

became visible at approximately 16/1700 UTC. Analysis and modeling of the event suggests potential for a glancing blow at Earth by mid UTC-day on 18 May, with the bulk of the material passing northward

of Earth's orbit. 

The other two M-flares, an M1.4 at 17/0339UTC and an M1.3 at 16/1629, were also from Regions 4435 and 4436, with the M1.3 following on the heels of the 16/1612UTC M1.9. The other 11 numbered

active regions on this visible disk were either quiet or only produced C-class activity during the past week. 3 Type II radio sweeps and an additional 10.7cm radio burst were observed during the

summary period, but they were not associated with any Earth-directed activity 

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at normal to moderate levels for the majority of the summary period, before increasing to high levels at 16/1740UTC. During the summary

period, the maximum value reached was 6,120 pfu at 17/1740UTC. 

Geomagnetic field activity reached G1-G2 (Minor-Moderate) geomagnetic storm levels on 15-16 May due to a negative polarity coronal hole high-speed stream becoming geoeffective late on 15 May.

Total magnetic field strength, Bt, increased all throughout 15 May, from approximately 3 nT to a peak of 17 nT at 15/1555UTC. The north-south component, Bz, rotated between +/- 11 nT, with maximum

southward deflections of approximately -13 nT. The interplanetary magnetic field had returned to background levels by the end of 16 May. A smaller positive polarity coronal hole high speed stream

became geoeffective on 13 May with a max Bt of 13 nT and maximum Bz southward deflection of -9 nT; however this only produced unsettled geomagnetic conditions and no NOAA Geomagnetic Storming thresholds

were reached. 

Forecast of Solar and Geomagnetic Activity 18 May - 13 June 2026

Solar activity is expected to be at low to moderate levels throughout the outlook period, with M-class activity (R1-R2, Minor-Moderate) ranging from a chance to likely and X-class activity (R3, Strong) ranging from a slight chance to a chance, due to the flare potential of several active regions currently on the visible disk and those both expected to return and indicated by Solar Orbiter magnetic imagery. 

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at high levels on 18 May and 21-23 May due to the influence from the current negative polarity coronal hole high-speed stream and an anticipated solar sector boundary cross on 21 May. The remaining days of the outlook period are likely to be at normal to moderate levels. 

Geomagnetic field activity is expected to reach G1 (Minor) geomagnetic storm levels over 18-19 May due to potential influences from the CME that left the Sun on 16 May, arriving in the near-Earth environment in the midst of the current high-speed stream. The remainder of the outlook period is anticipated to be at largely quiet to unsettled levels. 

:Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 May 18 0431 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-05-18

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 May 18     105          21          5

2026 May 19     110          21          5

2026 May 20     115           8          3

2026 May 21     115          10          3

2026 May 22     110           8          3

2026 May 23     112           5          2

2026 May 24     112           5          2

2026 May 25     115           5          2

2026 May 26     115           5          2

2026 May 27     115          12          4

2026 May 28     120          10          3

2026 May 29     125           8          3

2026 May 30     130           8          3

2026 May 31     135           8          3

2026 Jun 01     130           5          2

2026 Jun 02     130           5          2

2026 Jun 03     130           5          2

2026 Jun 04     125          12          4

2026 Jun 05     120           5          2

2026 Jun 06     115           5          2

2026 Jun 07     110           5          2

2026 Jun 08     105           5          2

2026 Jun 09     105          10          3

2026 Jun 10     100           5          2

2026 Jun 11      95          30          6

2026 Jun 12      95          25          5

2026 Jun 13      95          12          4

(NOAA)

Weekly Propagation Forecast Bulletins

 Product: Weekly Highlights and Forecasts

:Issued: 2026 Apr 20 0331 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact https://www.swpc.noaa.gov/content/subscription-services

#

#                Weekly Highlights and Forecasts

#

Highlights of Solar and Geomagnetic Activity 13 - 19 April 2026

Solar activity was at very low to low levels during the period. Very low levels occurred on 14, 15 and 19 Apr, while low levels were observed on 13, 16, 17, and 18 April. 

Region 4419 (N14, L=314, class/area=Eki/360 on 17 Apr) was the most active region of the period, responsible for 5 out of the 7 C-class flares observed during the week, including the largest one: a C4.1/Sf at 17/0442 UTC. The remaining 2 C-class flares of the period were: a C1.1/Sf at 13/1137 UTC from Region 4414 (N15, L=026, class/area=Dro/030 on 08 Apr) and a C1.6 at 18/0704 UTC from Region 4416 (N19, L=047, class/area=Dai/140 on 12 Apr). Coronal activity was observed during the week with some filament eruptions and few CMEs without Earth-directed components. 

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at high levels on 13-17 Apr, followed by a day at moderate levels on 18 Apr and returning to high levels on 19 Apr, with a maximum flux of 3,250 pfu observed at 15/1800 UTC. 

Geomagnetic field activity was quiet to Moderate storm levels during the period. From 13 to 17 Apr, the geomagnetic activity remained at quiet levels. On 18 Apr, the arrival of a negative polarity CH HSS influence disturbed the Geospace, elevating the activity from unsettled to Moderate storm levels. On 19 Apr, Moderate storm levels were observed during an isolated synoptic period (0600-0900 UTC) and the geomagnetic activity returned to quiet level by the end of the day as the CH HSS effects waned. 

Forecast of Solar and Geomagnetic Activity 20 April - 16 May 2026

Solar activity is expected to be at low levels, with a varying chance for M-class (R1-R2/Minor-Moderate) flares and a slight chance for X-class (R3/Strong or greater) flares through 16 May. 

No proton events are expected at geosynchronous orbit, barring any significant, non-recurrent solar activity. 

The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 20-22 Apr, 27-28 Apr, 30 Apr-05 May, and 08-14 May. Normal to moderate electron flux levels are expected on 23-26 Apr, 29 Apr, 06-07 May, and 15-16 May. 

Geomagnetic field activity is expected to remain at quiet to active levels during most of the outlook period, with the exception of 5 days when G1 (Minor) storm levels are anticipated due to the recurrent influence of CH HSS: 29-30 Apr (-CH HSS), 07 May (+CH HSS) and 15-16 May (-CH HSS). 

Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 Apr 20 0331 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web https://www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-04-20

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 Apr 20     105          18          4

2026 Apr 21     110          15          4

2026 Apr 22     120           8          3

2026 Apr 23     125           5          2

2026 Apr 24     120           8          3

2026 Apr 25     115           8          3

2026 Apr 26     120           5          2

2026 Apr 27     125           5          2

2026 Apr 28     125           5          2

2026 Apr 29     125          20          5

2026 Apr 30     125          18          5

2026 May 01     125          12          4

2026 May 02     125          10          4

2026 May 03     115           8          3

2026 May 04     108           8          3

2026 May 05     105           5          2

2026 May 06     100           5          2

2026 May 07      95          20          5

2026 May 08      90          15          4

2026 May 09      90           8          3

2026 May 10      95           5          2

2026 May 11     100           5          2

2026 May 12     105           5          2

2026 May 13     110           5          2

2026 May 14     110           5          2

2026 May 15     105          25          5

2026 May 16     105          20          5

(NOAA)

Weekly Propagation Forecast Bulletins

 :Product: Weekly Highlights and Forecasts

:Issued: 2026 Apr 13 0104 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact  www.swpc.noaa.gov/content/subscription-services

#

#                Weekly Highlights and Forecasts

#

Highlights of Solar and Geomagnetic Activity 06 - 12 April 2026

Solar activity was at very low to moderate levels during the period. Moderate levels were reached on 09 Apr, with low levels observed on 06-08 Apr and 11-12 Apr. Very low levels occurred on 10 Apr. 

Region 4409 (N02, L=158, class/area=Eai/190 on 07 Apr) was the most active region of the period, producing 11 C-class flares and the only M-class flare of the period, an impulsive M1.0/Sf at 09/0845

UTC. Region 4417 (S08, L=123, class/area=Dao/30 on 12 Apr) also contributed notable activity with 7 C-class flares after appearing quickly on 11 Apr near the West limb. Other activity included a

C8.7/Sf flare from Region 4414 (N15, L=26, class/area Dro/30 on 08 Apr) at 08/1543 UTC, which was associated with Type III radio emissions and a weak CME without any Earth-directed components. 

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at high levels throughout the reporting period. Flux levels reached a peak value of 10,679 pfu at 09/1605 UTC. 

Geomagnetic field activity ranged from quiet to active levels during the period. The beginning of the period (06-07 Apr) saw quiet to unsettled conditions as the influence of a negative polarity coronal

hole high speed stream (-CH HSS) continued to wane. From 10-12 Apr, quiet to active levels were observed under the onset and influence of a positive polarity CH HSS (+CH HSS). Quiet conditions prevailed

during all other days of the period under a nominal solar wind regime. 

Forecast of Solar and Geomagnetic Activity 13 April - 09 May 2026

Solar activity is expected to be at low levels, with a varying chance for M-class (R1-R2/Minor-Moderate) flares and a slight chance for X-class (R3/Strong or greater) flares through 09 May. 

No proton events are expected at geosynchronous orbit, barring any significant, non-recurrent solar activity. 

The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 13-17 Apr, 19-24 Apr, 26-28 Apr, 30 Apr-05 May, and 08-09 May. Normal to moderate flux levels are

expected on 18 Apr, 25 Apr, 29 Apr, and 06-07 May. 

Geomagnetic field activity is anticipated to reach G1-G2 (Minor-Moderate) storm levels on 19 Apr and 29 Apr due to -CH HSS influences, and on 07 May due to +CH HSS influences. Active

conditions are expected on 18 Apr, 20 Apr, and 30 Apr-01 May in response to -CH HSS effects, and on 15 Apr, 25 Apr, and 08 May due to +CH HSS effects. Mostly quiet to unsettled conditions are

expected for all other days of the period. 

Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 Apr 13 0104 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-04-13

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 Apr 13      95           8          3

2026 Apr 14      90           8          3

2026 Apr 15     100          12          3

2026 Apr 16     105           8          3

2026 Apr 17     110           5          2

2026 Apr 18     110          15          3

2026 Apr 19     110          20          4

2026 Apr 20     120          12          4

2026 Apr 21     130          10          3

2026 Apr 22     140           8          3

2026 Apr 23     145           5          2

2026 Apr 24     145           8          3

2026 Apr 25     140          12          4

2026 Apr 26     140          10          3

2026 Apr 27     140           5          2

2026 Apr 28     140           5          2

2026 Apr 29     135          20          5

2026 Apr 30     130          18          5

2026 May 01     125          12          4

2026 May 02     125          10          3

2026 May 03     115           8          3

2026 May 04     108           8          3

2026 May 05     105           5          2

2026 May 06     100           5          2

2026 May 07      95          20          4

2026 May 08      90          15          3

2026 May 09      90           8          3

(NOAA)

Weekly Propagation Forecast Bulletins

 Product: Weekly Highlights and Forecasts

:Issued: 2026 Apr 06 0211 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#                Weekly Highlights and Forecasts

#

Highlights of Solar and Geomagnetic Activity 30 March - 05 April 2026

Solar activity reached high levels on 30 Mar and 04 Apr, moderate levels on 02-03 Apr, with low levels observed on 31 Mar, 01 Apr, and 5 Apr. 

Region 4409 (N02, L=156, class/area=Eai/170 on 04 Apr) was the most active of the period, producing 50 C-class flares and six M-class flares. Region 4405 (S27, L=220, class/area=Eai/220 on 02 Apr) added the strongest flare of the period, an X1.4/Sf flare, on 30 Mar at

0319 UTC. Accompanying the flare was a Type II radio sweep (estimated velocity 1872 km/s) and a partial halo CME first seen in LASCO C2 imagery at 30/0312 UTC. Expected impacts from this CME were on 01 Apr. Region 4409 also produced a C8.1 flare at 01/1958 UTC.

Accompanying this flare was a filament eruption and subsequent CME that had a likely Earth-directed trajectory with impacts likely felt on 03-04 Apr. 

Slightly elevated proton levels were observed from 01-05 Apr, but conditions remained below alert thresholds throughout the period.   The greater than 2 MeV electron flux at geosynchronous orbit reached high levels throughout most of the period of 30 Mar - 05 Apr, with a

peak flux value of 6,000 pfu observed at 05/1645 UTC. The only exception was on 02 Apr when conditions dropped to moderate levels for that 24-hour reporting period. 

Geomagnetic field activity ranged from quiet to G3 (Strong) storm levels during the 30 Mar - 05 Apr period. Quiet to unsettled levels were observed on 30 Mar - 01 Apr, and most of 05 Apr (aside from an isolated active period at the beginning of the UT day). Conditions

increased to active to G2 (Moderate) levels on 02 Apr following the onset of a negative polarity coronal hole high speed stream (CH HSS). Conditions remained at active to G1 (Minor) levels through midday on 03 Apr, when they increased to G3 (Strong) levels with the

arrival of the anticipated CME from 01 Apr (C8.1 flare and filament eruption). Conditions then decreased to G1 levels to start 04 Apr, before decreasing to quiet to active conditions lasting through 05 Apr. 

Forecast of Solar and Geomagnetic Activity 06 April - 02 May 2026

Solar activity is expected to be at low levels, with a varying chance for M-class (R1-R2/Minor-Moderate) flares, and a slight chance for X-Class (R3/Strong) flares from 06 Apr through 02 May. 

No proton events are expected at geosynchronous orbit, barring any significant, non-recurrent solar activity. 

The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 06-09 Apr, 11-16 Apr, and 18 Apr-02 May. Normal to moderate flux levels are expected on 10 and 17 Apr. 

Geomagnetic field activity is anticipated to reach G1/G2 (Minor/Moderate) geomagnetic storm levels on 18-19, and 29 Apr due to the influence of negative polarity CH HSS (-CH HSS). Periods of G1 (Minor) storming are likely on 04 April in response to a negative

polarity CH HSS (-CH HSS). Unsettled to Active levels are expected on 06-07 Apr, 20-22 Apr, and 30 Apr, as well as 01-02 May associated with negative polarity CH HSS effects. On 10-13 and 25-26 April, positive polarity CH HSS influences are expected to bump geomagnetic

conditions to unsettled to active levels. Mostly quiet levels are expected during all other days of the period. 

Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 Apr 06 0211 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-04-06

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 Apr 06     118          10          3

2026 Apr 07     115           8          3

2026 Apr 08     113           5          2

2026 Apr 09     111           5          2

2026 Apr 10     108          12          4

2026 Apr 11     106          18          5

2026 Apr 12     105          10          4

2026 Apr 13     108           8          3

2026 Apr 14     110           7          2

2026 Apr 15     115           5          2

2026 Apr 16     115           4          2

2026 Apr 17     120           7          2

2026 Apr 18     122          48          6

2026 Apr 19     124          22          5

2026 Apr 20     130          12          4

2026 Apr 21     140          12          4

2026 Apr 22     150           8          3

2026 Apr 23     155           5          2

2026 Apr 24     160           8          3

2026 Apr 25     155          12          4

2026 Apr 26     150          10          3

2026 Apr 27     145           5          2

2026 Apr 28     140           5          2

2026 Apr 29     140          20          5

2026 Apr 30     135          18          5

2026 May 01     130          12          4

2026 May 02     120           8          3

(NOAA)

Weekly Propagation Forecast Bulletins

 Product: Weekly Highlights and Forecasts

:Issued: 2026 Mar 23 0245 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#                Weekly Highlights and Forecasts

#

Highlights of Solar and Geomagnetic Activity 16 - 22 March 2026

Solar activity reached moderate levels on 16-18 Mar, with low levels observed on 19-22 Mar. Region 4392 (S16, L=018, class/area=Csi/200 on 17 Mar) produced most of the flare activity observed throughout

the week, including three M-flares (R1-Minor). AR4392 produced an M2.7 flare at 16/1215 UTC with accompanying Type-II (est. 1,227 km/s), Type-IV, and Tenflare (380 sfu) emissions. The subsequent

asymmetric halo CME, first observed in LASCO C2 imagery at 16/1236 UTC, arrived at Earth on 20 Mar. AR4392 produced another M2.7 flare at 18/0842 UTC with accompanying Type-II (est. 860 km/s) and

Tenflare (229 sfu) emissions. The associated CME, first visible in LASCO C2 imagery at 18/0936 UTC, arrived simultaneously with the 16 Mar CME on 20 Mar. 

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit reached high levels on 16-20 and 22 Mar. Normal to moderate levels were observed on 21 Mar following a period of an elevated geomagnetic field

activity. 

Geomagnetic field activity reached G1-G3 (Minor-Strong) geomagnetic storm levels on 20-22 Mar, following the arrival of multiple CMEs  (that left the Sun on 16 and 18 Mar) on 20 Mar. The remainder of the

period was at quiet and quiet to unsettled levels under ambient solar wind conditions. 

Forecast of Solar and Geomagnetic Activity 23 March - 18 April 2026

Solar activity is expected to be at low levels with a varying chance for M-class (R1-R2/Minor-Moderate) flares through 18 Apr. 

No proton events are expected at geosynchronous orbit, barring significant flare activity. 

The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 23-25, 27-28, 30-31 Mar and 04-09, 11-15 Apr. Normal to moderate flux levels are expected to prevail

throughout the remainder of the period. 

Geomagnetic field activity is expected to reach G1-G2 (Minor-Moderate) geomagnetic storm levels on 23 Mar due to negative polarity CH HSS influences. Periods of G1 (Minor) storming are

likely on 03-04 Apr in response to negative polarity CH HSS influences. Periods of G1 (Minor) storming are likely on 09 and 11 Apr, with G2 (Moderate) storm periods likely on 10 Apr, due to

positive polarity CH HSS influences. G2 (Moderate) storm periods are likely again on 18 Apr following the onset of negative polarity CH HSS influences. 

Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 Mar 23 0245 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-03-23

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 Mar 23     120          34          6

2026 Mar 24     120          14          3

2026 Mar 25     122          12          3

2026 Mar 26     125          12          3

2026 Mar 27     130           8          3

2026 Mar 28     130           5          2

2026 Mar 29     128           8          3

2026 Mar 30     125          15          4

2026 Mar 31     125          10          3

2026 Apr 01     130           5          2

2026 Apr 02     120           5          2

2026 Apr 03     120          18          5

2026 Apr 04     115          24          5

2026 Apr 05     110          10          3

2026 Apr 06     120          15          4

2026 Apr 07     120           8          3

2026 Apr 08     118           7          2

2026 Apr 09     120          25          5

2026 Apr 10     110          40          6

2026 Apr 11     112          20          5

2026 Apr 12     115          12          3

2026 Apr 13     115           8          3

2026 Apr 14     110           7          2

2026 Apr 15     115           5          2

2026 Apr 16     115           4          2

2026 Apr 17     120           7          2

2026 Apr 18     122          48          6

(NOAA)

Weekly Propagation Forecast Bulletins

 Product: Weekly Highlights and Forecasts

:Issued: 2026 Mar 16 0302 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC cweb ontact www.swpc.noaa.gov/content/subscription-services

#

#                Weekly Highlights and Forecasts

#

Highlights of Solar and Geomagnetic Activity 09 - 15 March 2026

Solar activity was at low to moderate levels with a total of 37 C-class flares and 2 M-class flares observed. The largest flares of the period were an M1.2 flare on 13/0955 UTC from Region 4384 (N10, L=150, class/area Eho/300 on 03 Mar), a C8.9/1n flare on 13/2023  from Region 4392 (S15, L=017, class/area Cso/170 on 15 Mar), and an M1.0/Sf flare on 15/0939 UTC from Region 4392. The most active region of the period was Region 4381 (N08, L=173, class/area Eao/220 on 03 Mar), which produced a long-duration C8.0 flare on 13/1518 UTC in addition to 11 other weak C-class events. 

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit reached high levels on 09 - 13 Mar and 15 Mar with a peak flux of 2,940 pfu observed at 12/1545 UTC. Normal to moderate levels were observed on 14 Mar. 

Geomagnetic field activity ranged from quiet to G2 (Moderate) storm levels throughout the 09-15 Mar period. The week began at quiet to unsettled levels on 09 Mar, with active conditions observed on 10-11 Mar due to the influence of a negative polarity coronal hole high speed stream (CH HSS). Conditions returned to mostly quiet to unsettled levels by 12 Mar. Activity intensified midday on 13 Mar, reaching G1 (Minor) to G2 (Moderate) storm levels following the onset of a positive polarity CH HSS. These storming levels continued through the first half of 14 Mar before waning to unsettled and active levels later in the day. On 15 Mar, the field reached active levels early in the period, followed by a return to quiet and unsettled conditions as positive polarity CH HSS effects gradually diminished. 

Solar wind parameters reflected the influence of two distinct CH HSS regimes during the period. The week began under the influence of a negative polarity CH HSS, with solar wind speeds initially ranging between 450-500 km/s before gradually declining to ambient levels near 400 km/s by 12 Mar. Total magnetic field (Bt) remained mostly around 6 nT during this interval, while the North-South (Bz) component saw periodic southward deflections to -7 nT. A solar sector boundary crossing (SSBC) occurred early on 13 Mar, indicated by a shift in the phi angle from the towards to away sector. This was immediately followed by the onset of a more powerful positive polarity CH HSS. Solar wind speeds rose sharply from 400 km/s to a peak of 725 km/s on 14 Mar. During this period, Bt reached 13 nT and the Bz component reached a maximum southward deflection of -10 nT.

By 15 Mar, solar wind speeds began a slow decline but remained elevated near 600 km/s through the end of the period. 

Forecast of Solar and Geomagnetic Activity 16 March - 11 April 2026

Solar activity is expected to be at low levels, with a slight chance for M-class (R1-R2/Minor-Moderate) flares throughout the outlook period. Elevated probabilities are related to the flare potential of both currently observed spot groups as well as the potential from returning regions. 

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at high levels on 16-20, 22-30 Mar, 04-09, and 11 Apr due to the influence of multiple, recurrent, CH HSSs. The remainder of the outlook period is likely to be at normal to moderate levels. 

Geomagnetic field activity levels are likely to reach G1 (Minor) geomagnetic storm levels on 22 Mar, 04 Apr, 09 Apr, and 11 Apr due to CH HSS influences. G2 (Moderate) geomagnetic storm levels are likely on 11 Mar and 10 Apr due to CH HSS influences. Unsettled to active levels are likely on 16-18, 20, 23-27, 30-31 Mar, and 03 and 05-07 Apr. All elevated levels of geomagnetic activity are associated with the anticipated influence of multiple, recurrent, CH HSSs. The remainder of the outlook period is likely to be at mostly quiet levels. 

Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 Mar 16 0302 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-03-16

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 Mar 16     108          15          4

2026 Mar 17     108          10          3

2026 Mar 18     105           8          3

2026 Mar 19     105           5          2

2026 Mar 20     105          10          3

2026 Mar 21     100          35          5

2026 Mar 22     102          25          5

2026 Mar 23     105          15          4

2026 Mar 24     110          15          4

2026 Mar 25     100          18          5

2026 Mar 26     110          10          3

2026 Mar 27     120           8          3

2026 Mar 28     125           5          2

2026 Mar 29     125           5          2

2026 Mar 30     125          15          4

2026 Mar 31     125          10          3

2026 Apr 01     130           5          2

2026 Apr 02     135           5          2

2026 Apr 03     140          18          5

2026 Apr 04     135          20          5

2026 Apr 05     135           8          3

2026 Apr 06     130          15          4

2026 Apr 07     135           8          3

2026 Apr 08     130           5          2

2026 Apr 09     125          25          5

2026 Apr 10     120          40          6

2026 Apr 11     115          20          5

(NOAA)

Weekly Propagation Forecast Bulletins

 :Product: Weekly Highlights and Forecasts

:Issued: 2026 Feb 09 0534 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contactt www.swpc.noaa.gov/content/subscription-services

#

#                Weekly Highlights and Forecasts

#

Highlights of Solar and Geomagnetic Activity 02 - 08 February 2026

Solar activity reached high levels on 02-04 Feb, moderate levels on 05 and 08 Feb, and low levels on 06-07 Feb. The flare activity was dominated by Region 4366 (N14, L=204, class/area Fkc/1100 on 03

Feb). This region produced 31 C-class flares, 38 M-class (R1/R2-Minor/Moderate), and four X-class (R3-Strong) flares. The X-class flares included: an X2.8 at 02/0036 UTC, an X1.6 at 02/0814

UTC, an X1.5 at 03/1408 UTC, and an X4.2 at 04/1213 UTC. Region 4366 also added four M-class flares that were greater than the M5 level.

These included: an M5.2 at 02/0251 UTC, an M6.7 at 02/1124 UTC, an M7.2/1n at 03/0701 UTC, and an M7.2 at 03/1456 UTC. The remaining 34 M-class flares produced by Region 4366 were at the R1/R2 levels,

ranging from M1.1 to M4.9. Surprisingly, very few radio emissions were observed in association with the increased flare activity.  There were only three F10.7 cm radio bursts recorded during the

week. The first was a burst of 140 sfu associated with the X1.5 flare at 03/1408 UTC, second was a 110 sfu burst that accompanied the M2.2 flare at 05/1934 UTC, and last, a 440 sfu burst that

coincided with the M2.7 flare at 08/1353 UTC. The only other radio signature of note was a Type II radio sweep that was detected by USAF observatories starting at about 02/0000 UTC, with an estimated

velocity of 955 km/s. No other radio signatures were noted. Other activity included a large, slow-moving filament eruption centered near N18W30 that began at 03/0400 UTC as seen in SUVI 304 imagery.

An associated CME was observed off the NW limb at 03/1836 UTC. There was another narrow eruption noted off the NE, first visible in SOHO/LASCO C2 imagery at 04/1426 UTC. This event was likely a

sympathetic eruption triggered by the X4.2, starting at approximately 04/1350 UTC near N15W22 between Regions 4366 and 4367 (N09, L=174, class/area Cao/50 on 03 Feb). There is a slight

potential of minor glancing blows from these eruptions early on 09 Feb. A coronal mass ejection was observed off the south/southwest limb in SOHO/LASCO C2 imagery at 05/1548 UTC. The source is likely

associated with an M1.8/1N flare from Region 4362 (S17, L=207,  class/area Dao/50 on 07 Feb) that peaked at 05/1513 UTC. Surface signatures in SUVI 284 imagery showed a faint southerly deflected

EUV wave. Model output suggests a glancing effect late on 08 Feb to early on 09 Feb. 

No proton events were observed at geosynchronous orbit on 02-08 Feb.

The greater than 2 MeV electron flux at geosynchronous orbit reached high levels on 02, 03, 04, and 08 Feb, with a peak flux value of 13,970 pfu at 04/1605 UTC. 

Geomagnetic field activity reached G1 (Minor) storm levels on 05 Feb following the arrival of a CME from an X8.1 flare that originated from Region 4366 at 01/2357 UTC. Conditions were at quiet to

unsettled levels on 02-03 Feb and for the first half of 04 Feb before increasing to active levels following the onset of a negative polarity coronal hole (CH) high speed stream (HSS). Quiet to active

conditions were observed on 06-07 Feb with combined influence from a negative polarity CH HSS and a possible passing transient. Quiet to unsettled levels returned by 08 Feb as -CH HSS effects lingered. 

Forecast of Solar and Geomagnetic Activity 09 February - 07 March 2026

Solar activity is expected to continue at moderate levels with further M-class (R1-R2, Minor-Moderate) flares expected and a chance for X-class (R3-Strong or greater) on 09-10 Feb as Region 4366

transits the western limb. Low levels, with a chance for M-class flares, are expected on 11-22 Feb. An increase to moderate to high levels is once again likely on 23-28 Feb as Region 4366 returns to

the visible disk. Conditions should again return to low to moderate levels on 01-07 Mar as old Region 4366 rotates to the far side once again. 

There is a chance for the 10 MeV proton flux to reach S1-S2 (Minor-Moderate) storm levels through 12 Feb as Region 4366 transits the visible disk and beyond. Levels are likely to be below the S1

(Minor) level on 12-22 Feb. An increase to above the S1 (Minor) storm levels 23-28 Feb is possible as Region 4366 returns to the visible disk. Chances decrease on 01-07 Mar as old Region 4366

rotates to the far side once again. 

The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at high levels on 09-10 Feb, 16-21 Feb, 24-25 Feb, and 05-07 Mar as CH HSS influence sporadically continue. 

Geomagnetic field activity is expected to be at unsettled to active levels on 09-10 Feb as CH HSS influence decreases. Barring the potential for CME activity, mostly quiet to unsettled levels are

expected from 11-15 Feb, 22-23 Feb, and 26 Feb - 04 Mar. Unsettled to active levels are likely on 16-21 Feb, 24-25 Feb, and 05-07 Mar due to recurrent negative polarity CH HSS effects. 

Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 Feb 09 0534 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC contact www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-02-09

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 Feb 09     165          15          4

2026 Feb 10     160           8          3

2026 Feb 11     155           5          2

2026 Feb 12     150           5          2

2026 Feb 13     145           5          2

2026 Feb 14     140           5          2

2026 Feb 15     150           5          2

2026 Feb 16     160          15          4

2026 Feb 17     170          15          4

2026 Feb 18     180          15          4

2026 Feb 19     175          15          4

2026 Feb 20     170          15          4

2026 Feb 21     160          15          4

2026 Feb 22     150           8          3

2026 Feb 23     140           8          3

2026 Feb 24     135          20          5

2026 Feb 25     130          20          5

2026 Feb 26     130           8          3

2026 Feb 27     140           5          2

2026 Feb 28     160           5          2

2026 Mar 01     165           5          2

2026 Mar 02     170           5          2

2026 Mar 03     170           5          2

2026 Mar 04     170           5          2

2026 Mar 05     165          15          4

2026 Mar 06     165          15          4

2026 Mar 07     165           8          3

(NOAA)

Weekly Propagation Forecast Bulletins

 Product: Weekly Highlights and Forecasts

:Issued: 2026 Feb 02 0937 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#                Weekly Highlights and Forecasts

#

Highlights of Solar and Geomagnetic Activity 26 January - 01 February 2026

Solar activity ranged from low levels to very high levels. On 26-30 Jan, mostly low level C-class flaring was observed with the majority of the flares occurring from Regions 4351 (S04, L=004, class/area

Dai/080 on 24 Jan), 4353 (N18, L=359, class/area Dai/110 on 25 Jan). The largest flare during this timeframe was a C8.8 at 26/1339 UTC from Region 4355 (S12, L=299, class/area Cao/020 on 25 Jan). On 30 Jan, a new region emerged in the NE quadrant and was numbered 4366 (N14, L=202, class/area Ekc/550 on 01 Feb). This region quickly grew into a large, compact, and magnetically complex region over 31 Jan-01 Feb. Multiple delta magnetic configurations evolved as the region grew. Consequently, there were 17 M-class flares and 2 X-class flares observed on 01 Feb. The largest was an X8.1 flare at 01/2357 UTC. Associated with X8.1 flare was observed three CMEs that appeared in SOHO LASCO C2 imagery beginning at 02/0048-0300 UTC which was also evident in GOES/SUVI 304 imagery. Modelling was currently underway at the timing of this report. 

A greater than 10 MeV proton enhancement near 1 pfu (below S1-Minor) was still in progress from the event that began on 18 Jan, but declined to near background levels by 28 Jan. 

The greater than 2 MeV electron flux at geosynchronous orbit reached high levels on 26 Jan-01 Feb with a peak flux of 13,200 pfu observed at 27/1650 UTC. 

Geomagnetic field activity ranged from quiet to G1 (Minor) levels over the period. The period began under positive polarity CH HSS conditions with solar wind speed averaging around 500 km/s with total field around 5-8 nT. Solar wind conditions returned to nominal levels by early on 27 Jan. A solar sector boundary crossing from positive to negative occurred around 27/1500 UTC followed by an increase in total field to 13 nT and solar wind speed increase to around 670 km/s on 28-29 Jan as a negative polarity CH HSS became geoeffective. Solar wind speeds gradually subsided to nominal levels by 01 Feb. The geomagnetic field responded with quiet to unsettled

levels on 26-27 Jan, unsettled to G1 (Minor) storming on 28 Jan, quiet to active levels on 29-30 Jan, and quiet conditions on 31 Jan - 01 Feb. 

Forecast of Solar and Geomagnetic Activity 02 February - 28 February 2026

Solar activity is expected to continue at moderate to high levels with further M-class (R1-R2, Minor-Moderate) flares expected and a high chance for X-class (R3-Strong or greater) on 02-10 Feb as Region 4366 transits across the visible disk. Low levels with a chance for M-class flares are expected on 11-22 Feb. An increase to moderate to high levels is once again likely on 23-28 Feb as Region 4366 returns to the visible disk. 

The greater than 10 MeV proton flux is likely to reach S1-S2 (Minor-Moderate) storm levels on 02-04 Feb due to proton prediction model guidance from the recent X8.1 flare. A chance for further proton enhancements exist through 12 Feb as Region 4366 transits the visible disk and beyond. 

The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 02-03 Feb, 06-12 Feb, and 15-28 Feb due to recurrent CH HSS influence. 

Geomagnetic field activity is expected to be at mostly quiet levels on 02-05 Feb barring the potential for CME activity related to the X8.1 flare. Quiet to unsettled levels are expected from 05-11 Feb, 22-23 Feb, and 26 Feb. Unsettled to active levels are expected on 13-21 Feb, and 24-25 Feb, with G1 (Minor) levels likely on 13 Feb due to recurrent CH HSS effects. 

:Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 Feb 02 0938 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-02-02

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 Feb 02     160           5          2

2026 Feb 03     155           5          2

2026 Feb 04     155           5          2

2026 Feb 05     145           5          2

2026 Feb 06     120           8          3

2026 Feb 07     125           8          3

2026 Feb 08     130           8          3

2026 Feb 09     135          10          3

2026 Feb 10     140           8          3

2026 Feb 11     135           8          3

2026 Feb 12     140           5          2

2026 Feb 13     145          20          5

2026 Feb 14     145          15          4

2026 Feb 15     155          15          4

2026 Feb 16     160          15          4

2026 Feb 17     170          15          4

2026 Feb 18     180          15          4

2026 Feb 19     175          15          4

2026 Feb 20     170          15          4

2026 Feb 21     160          15          4

2026 Feb 22     150           8          3

2026 Feb 23     140           8          3

2026 Feb 24     135          20          4

2026 Feb 25     130          20          4

2026 Feb 26     130           8          3

2026 Feb 27     140           5          2

2026 Feb 28     160           5          2

(NOAA)

Weekly Propagation Forecast Bulletins

 Product: Weekly Highlights and Forecasts

:Issued: 2026 Jan 19 0216 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#                Weekly Highlights and Forecasts

#

Highlights of Solar and Geomagnetic Activity 12 - 18 January 2026

Solar activity ranged from low to strong levels. Forty-five C-class, three M-class (R1-Minor) and one X-class (R3-Strong) activity was observed from various regions on the disk during the period. A majority of the activity was observed from Regions 4341 (S11, L=046, class/area Dkc/840 on 16 Jan), 4342 (N17, L=041, class/area Dso/180 on 16 Jan) and 4343 (S11, L=097, class/area Dki/310 on 16 Jan). 

Region 4341 produced the following R1 (Minor) flare activity: an M1.6/1f at 14/2033 UTC, an M2.1/2b at 17/1029 UTC and an M1.1/2n at 17/2351 UTC. This region also produced an X1.9/3b long-duration event at 18/1809 UTC. Associated with this flare was a 693 km/s Type II sweep, a Type IV sweep, a 3,200 sfu Tenflare and a Castelli-U radio burst. An associated full-halo CME was first noted in GOES CCOR-1 imagery at about 18/1830 UTC. Additional coronagraph imagery will determine any Earth-directed component. 

A 10 MeV at 10 pfu proton event at geosynchronous orbit (S1-Minor) was first observed at 18/2255 UTC. This event occurred in association with the X1.9 flare at 18/1830 UTC. 

The greater than 2 MeV electron flux at geosynchronous orbit reached high levels on 12-18 Jan. A peak flux of 9,398 pfu was observed at 14/1645 UTC. 

Geomagnetic field activity was at quiet to minor storm levels (G1-Minor) throughout the period. Quiet to active levels were detected on 12-13 Jan associated with waning CME influence and effects from a negative polarity CH HSS. Mostly quiet levels were observed on 14 Jan. Unsettled to minor storm (R1-Minor) levels were detected on 15 through midday on 17 Jan. Unsettled to active levels were observed on the latter half of 17 Jan through 18 Jan due to positive polarity CH HSS. 

Forecast of Solar and Geomagnetic Activity 19 January - 14 February 2026

Solar activity is likely to remain at low levels, with a chance for R1-R2 (Minor-Moderate) and a slight chance for R3 (Strong) levels over the next forecast period, all due to multiple regions on the visible disk as well as regions expected to return. 

10 Mev at 10 pfu proton events (S1-Minor) are expected at geosynchronous orbit on 19-20 Jan. 

The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 19-27 Jan and 12-14 Feb, all due to the anticipated influence of multiple, recurrent coronal holes. The remainder of the outlook period is likely to be at normal to moderate levels. 

Geomagnetic field activity is likely to reach (G1-Minor) geomagnetic storm levels on 29 Jan and unsettled to active levels on 19-23, 27-28, 30-31 Jan, 04-11 and 13-14 Feb. All enhancements in activity are due to the anticipated influence of multiple, recurrent CH HSSs. The remainder of the outlook period is expected to be mostly quiet. 

:Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 Jan 19 0216 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC  web contact www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-01-19

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 Jan 19     160          20          4

2026 Jan 20     165          16          4

2026 Jan 21     170          10          3

2026 Jan 22     175           8          3

2026 Jan 23     180           8          3

2026 Jan 24     180           5          2

2026 Jan 25     175           5          2

2026 Jan 26     170           5          2

2026 Jan 27     165          10          3

2026 Jan 28     160          15          4

2026 Jan 29     165          25          5

2026 Jan 30     165          12          4

2026 Jan 31     160          10          3

2026 Feb 01     155           5          2

2026 Feb 02     150           5          2

2026 Feb 03     145           5          2

2026 Feb 04     140          15          4

2026 Feb 05     130          12          4

2026 Feb 06     120          10          3

2026 Feb 07     125           8          3

2026 Feb 08     130           8          3

2026 Feb 09     135          10          3

2026 Feb 10     140           8          3

2026 Feb 11     135           8          3

2026 Feb 12     135           5          2

2026 Feb 13     135          20          4

2026 Feb 14     140          15          4

(NOAA)

Weekly Propagation Forecast Bulletins

 Product: Weekly Highlights and Forecasts

:Issued: 2026 Jan 12 0311 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#                Weekly Highlights and Forecasts

#

Highlights of Solar and Geomagnetic Activity 05 - 11 January 2026

Solar activity ranged from low to moderate levels. Forty-five weak to middle-level C-class activity was observed from various regions on the disk during the period. A majority of the activity was observed from Regions 4334 (S16, L=200, class/area Dao/150 on 08 Jan), 4336 (S10, L=166, class/area Eko/430 on 09 Jan) and 4337 (N25, L=243, class/area Dao/020 on 08 Jan). At 11/2314 UTC, a long-duration M3.3 (R1-Minor) flare was observed from behind the ESE limb. Several potential Earth-directed CMEs were observed leaving the Sun on 08 Jan with possible impact on late 10 Jan to early on 11 Jan. 

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at normal to moderate levels on 05, 08, 09 and 11 Jan with high levels observed on 06, 07, and 10 Jan. A peak flux of 2,507 pfu was observed on 10/1635 UTC. 

Geomagnetic field activity was at quiet to active levels on 05 Jan in response to declining CH HSS influence. Quiet levels were observed on 06 and 07 Jan. Quiet to active levels were observed on 08, 09 and early 10 Jan due to CH HSS influence. Activity levels increased to G1 (Minor) to G2 (Moderate) activity levels during late 10 Jan through 11 Jan due to CME effects from the 08 Jan CME coupled with CH HSS effects. 

Forecast of Solar and Geomagnetic Activity 12 January - 07 February 2026

Solar activity is likely to remain at low levels, with a chance for R1 (Minor) conditions and a slight chance for R2/R3 (Moderate/Strong) over the next forecast period due to multiple regions on the visible disk as well as regions expected to return. 

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 12, 14-15, 21-27, and 30-31 Jan and 01-03 and 05-07 Feb due to the anticipated influence of multiple, recurrent coronal holes. The remainder of the outlook period is likely to be at normal to moderate levels. 

Geomagnetic field activity is likely to reach G1 (Minor) geomagnetic storm levels on 12 and 29 Jan; unsettled to active levels on 13-16, 19-23, 27-28, 30-31 Jan and 04-07 Feb. All enhancements in geomagnetic activity are due to the anticipated influence of

multiple, recurrent CH HSSs. The remainder of the outlook period is expected to be mostly quiet. 

Product: 27-day Space Weather Outlook Table 27DO.txt

:Issued: 2026 Jan 12 0312 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services

#

#      27-day Space Weather Outlook Table

#                Issued 2026-01-12

#

#   UTC      Radio Flux   Planetary   Largest

#  Date       10.7 cm      A Index    Kp Index

2026 Jan 12     110          28          6

2026 Jan 13     110          18          4

2026 Jan 14     112          12          4

2026 Jan 15     110           8          3

2026 Jan 16     108           8         

2026 Jan 17     106           5          2

2026 Jan 18     106           5          2

2026 Jan 19     110          18          4

2026 Jan 20     115          15          4

2026 Jan 21     125          12          4

2026 Jan 22     135           8          3

2026 Jan 23     140           6          2

2026 Jan 24     135           6          2

2026 Jan 25     135           6          2

2026 Jan 26     135           6          2

2026 Jan 27     130          10          3

2026 Jan 28     125          15          4

2026 Jan 29     125          25          5

2026 Jan 30     130          12          4

2026 Jan 31     130          10          3

2026 Feb 01     125           5          2

2026 Feb 02     120           5          2

2026 Feb 03     115           5          2

2026 Feb 04     110          15          4

2026 Feb 05     105          12          4

2026 Feb 06     105          10          3

2026 Feb 07     110           8          3

(NOAA)