:Product: Weekly Highlights and Forecasts
:Issued: 2026 Apr 13 0104 UTC
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#                Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
06 - 12 April 2026

Solar activity was at very low to moderate levels during the period.
Moderate levels were reached on 09 Apr, with low levels observed on
06-08 Apr and 11-12 Apr. Very low levels occurred on 10 Apr. 

Region 4409 (N02, L=158, class/area=Eai/190 on 07 Apr) was the most
active region of the period, producing 11 C-class flares and the
only M-class flare of the period, an impulsive M1.0/Sf at 09/0845
UTC. Region 4417 (S08, L=123, class/area=Dao/30 on 12 Apr) also
contributed notable activity with 7 C-class flares after appearing
quickly on 11 Apr near the West limb. Other activity included a
C8.7/Sf flare from Region 4414 (N15, L=26, class/area Dro/30 on 08
Apr) at 08/1543 UTC, which was associated with Type III radio
emissions and a weak CME without any Earth-directed components. 

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at
high levels throughout the reporting period. Flux levels reached a
peak value of 10,679 pfu at 09/1605 UTC. 

Geomagnetic field activity ranged from quiet to active levels during
the period. The beginning of the period (06-07 Apr) saw quiet to
unsettled conditions as the influence of a negative polarity coronal
hole high speed stream (-CH HSS) continued to wane. From 10-12 Apr,
quiet to active levels were observerd under the onset and influence
of a positive polarity CH HSS (+CH HSS). Quiet conditions prevailed
during all other days of the period under a nominal solar wind
regime. 

Forecast of Solar and Geomagnetic Activity
13 April - 09 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 or greater) flares through 09 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 13-17 Apr, 19-24 Apr, 26-28 Apr, 30
Apr-05 May, and 08-09 May. Normal to moderate flux levels are
expected on 18 Apr, 25 Apr, 29 Apr, and 06-07 May. 

Geomagnetic field activity is anticipated to reach G1-G2
(Minor-Moderate) storm levels on 19 Apr and 29 Apr due to -CH HSS
influences, and on 07 May due to +CH HSS influences. Active
conditions are expected on 18 Apr, 20 Apr, and 30 Apr-01 May in
response to -CH HSS effects, and on 15 Apr, 25 Apr, and 08 May due
to +CH HSS effects. Mostly quiet to unsettled conditions are
expected for all other days of the period.