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
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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)