Product: Weekly Highlights and Forecasts
:Issued: 2025 Apr 28 0054 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 21 - 27 April 2025
Solar activity reached moderate levels on 21 and 22 Apr due to M-class flare activity. Region 4062 (S03, L=69, class/area=Dki/300 on 18 Apr) produced an M1.9 flare at 21/1837 UTC and Region 4065 (S29, L=42, class/area=Dso/80 on 20 Apr) produced an M1.3 at 22/1049 UTC. Low levels were observed throughout the remainder of the period. No Earth-directed CMEs resulted from this week's activity.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit reached high levels on 27 Apr, while normal to moderate levels prevailed throughout the remainder of the period.
Geomagnetic field activity reached G1 (Minor) storm levels on 21 Apr, and active levels on 22 Apr, due to positive polarity CH HSS influences. Active conditions were observed again on 24 Apr due to a prolonged bout of southward IMF. Quiet and quiet to unsettled levels were observed throughout the remainder of the week.
Forecast of Solar and Geomagnetic Activity 28 April - 24 May 2025
Solar activity is expected to be predominately low through the outlook period with a varying chance for M-class flare activity.
No proton events are expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is likely to reach high levels on 28-30 Apr and 03-12 May. Normal to moderate levels are likely to prevail throughout the remainder of the period.
Geomagnetic field activity is likely to reach G1 (Minor) storm levels on 05-06 May due to negative polarity CH HSS influences, and again on 18 May due to positive polarity CH HSS influences. Periods of active conditions are likely on 28 Apr, 02, 07-10, and 16-17 May in response to CH HSS influences. Quiet and quiet to unsettled levels are expected to prevail throughout the remainder of the period.
Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2025 Apr 28 0054 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 2025-04-28
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2025 Apr 28 150 10 4
2025 Apr 29 145 8 3
2025 Apr 30 140 5 2
2025 May 01 140 5 2
2025 May 02 140 12 4
2025 May 03 140 10 3
2025 May 04 140 8 3
2025 May 05 150 18 5
2025 May 06 160 18 5
2025 May 07 160 15 4
2025 May 08 165 15 4
2025 May 09 165 15 4
2025 May 10 165 15 4
2025 May 11 160 10 3
2025 May 12 155 5 2
2025 May 13 155 5 2
2025 May 14 155 5 2
2025 May 15 155 5 2
2025 May 16 155 12 4
2025 May 17 155 12 4
2025 May 18 155 25 5
2025 May 19 155 10 3
2025 May 20 155 8 3
2025 May 21 160 8 3
2025 May 22 160 6 2
2025 May 23 160 6 2
2025 May 24 155 6 2
(NOAA)
