Subject: Weekly Highlights of Solar and Geomagnetic Activity, 27 April - 03 May 2026

:Product: Weekly Highlights and Forecasts
:Issued: 2026 May 04 0142 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
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# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
27 April - 03 May 2026

Solar activity reached moderate levels on 27 and 18 Apr due to
M-class (R1-Minor) activity from Region 4425 (N05, L=162,
class/area=Ekc/320 on 28 Apr) and 4420 (S18, L=246,
class/area=Eki/300 on 21 Sep). Region 4420 produced the strongest
flare of the period, an M1.5/Sn (R1) flare at 28/1353 UTC. The
region also produced two Type II radio sweeps alongside C-class
activity. The ejecta associated with the activity originated from
near the NW limb and was not suspected to contain an Earth-directed
component. The other 13 numbered active regions on the visible disk
were either mostly quiet or only produced C-class X-ray activity. No
other Earth-directed CMEs were identified in available coronagraph
imagery.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was
normal to moderate levels over the past seven days.

Geomagnetic field activity reached G1 (Minor) geomagnetic storm
levels on 30 Apr and active levels on 01 May due to influence from a
negative polarity CH HSS. Total magnetic field strength reached a
brief peak of 14 nT on 30 Apr, with Bz reaching as far south as -12
nT. Solar wind speeds peak at just over 500 km/s early on 01 May and
gradually waned over the next two days. The remainder of the period
was at quiet to unsettled levels.

Forecast of Solar and Geomagnetic Activity
04 May - 30 May 2026

Solar activity is likely to be at low levels with a chance for
M-Class (R1/R2-Minor/Moderate) throughout the outlook period due to
the flare potential of multiple regions on the visible disk as well
as multiple complex regions due to return from the Sun's
farside.

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 15-20 May due to influence from a
recurrent, negative polarity coronal hole. The remainder of the
outlook period is expected to at normal to moderate levels.

Geomagnetic field activity is expected to reach G1 (Minor)
geomagnetic storm levels on 15-17 May; active levels are likely on
08 May, 18 May, 23 May, and 27 May; unsettled levels are likely on
04 May, 09 May, 21-22 May, and 27 May. All enhancements in
geomagnetic activity are forecast in anticipation of influence fron
multiple, recurrent, coronal hole HSSs. The remainder of the outlook
period is expected to be at mostly quiet levels.


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