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Subject: Weekly Highlights of Solar and Geomagnetic Activity, 21 - 27 April 2025
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Date: Mon, 28 Apr 2025 13:00:06 EDT
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: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 contact on the Web
# https://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.