Product: Weekly Highlights and Forecasts
:Issued: 2025 Mar 24 0202 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact at www.swpc.noaa.gov/content/subscription-services
#
# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity 17 - 23 March 2025
Solar activity was at moderate levels (R1-Minor) on 17, 19 and 21 March. Region 4033 (N24, L=122, class/area Bxo/010 on 15 Mar) produced an M1.0/1f at 17/1933 UTC. This event produced a northerly vector CME with a possible weak Earth impact. Region 4031 (N16, L=165, class/area Eai/120 on 19 Mar) produced an M1.5/1n at 19/2040 UTC. Region 4028 (S17, L=141, class/area Dai/240 on 15 Mar) produced an M1.2/1n at 21/1558 UTC/ Associated with this event was a Type II sweep with an estimated velocity of 504 km/s. At about the same time as this flare, a fast shock signature CME off the SE appeared to have originated from the vicinity of Region 4034 (S12, L=112,
class/area Cso/020 on 20 Mar).
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at high levels on 17 and 18 March with a peak flux of 6,680 pfu at 17/1600 UTC. Low to moderate levels were observed on 19-23 March.
Geomagnetic field activity was at quiet to unsettled levels on 17-18 March and quiet to minor storm (G1-Minor) levels on 19 March. This activity was attributed to negative polarity CH HSS combined with CME effects. Quiet levels were observed on 20 March. Activity levels
increased to unsettled to minor and moderate (G1-G2/Minor-Moderate) storm levels on 21-22 March. This activity was attributed to the 17 March CME and negative polarity CH HSS effects. Quiet to active levels were observed on 21 March due to waning CME effects.
During the highlight period, Bt peaked at 40 nT and Bz dipped south to -17 nT late on 21 March. Solar wind speeds generally peaked to 525 km/s mid to late on 19 March and again late on 22 March to early on 23 March.
Forecast of Solar and Geomagnetic Activity 24 March - 19 April 2025
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Solar activity is expected to be at a chance for R1-R2 (Minor-Moderate) levels through the outlook period.
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 27-31 March and 06-14 April. Low to moderate levels are expected on 24-26 March, 01-05 April and 15-19 April.
Geomagnetic field activity is expected to be at active to G1-Minor levels on 24 March due to CME effects. G1-G2 (Minor-Moderate) levels on 25-26 March and unsettled to active levels on 27-29 March are forecasted due to positive polarity CH HSS influence. A combination
of unsettled to G1-Minor levels are forecasted for 04-19 April due to negative polarity CH HSS influence.
roduct: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2025 Mar 24 0202 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 2025-03-24
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2025 Mar 24 170 20 5
2025 Mar 25 170 30 6
2025 Mar 26 165 20 5
2025 Mar 27 160 15 4
2025 Mar 28 160 12 4
2025 Mar 29 160 8 3
2025 Mar 30 165 5 2
2025 Mar 31 165 5 2
2025 Apr 01 170 5 2
2025 Apr 02 170 5 2
2025 Apr 03 175 10 3
2025 Apr 04 180 20 5
2025 Apr 05 180 35 6
2025 Apr 06 180 10 3
2025 Apr 07 180 12 4
2025 Apr 08 180 30 5
2025 Apr 09 185 40 6
2025 Apr 10 185 25 5
2025 Apr 11 185 18 5
2025 Apr 12 180 10 3
2025 Apr 13 175 15 5
2025 Apr 14 170 12 4
2025 Apr 15 170 8 3
2025 Apr 16 165 5 2
2025 Apr 17 160 10 3
2025 Apr 18 160 12 4
2025 Apr 19 160 8 3
(NOAA)
