:Product: Weekly Highlights and Forecasts
:Issued: 2026 Apr 20 0331 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
13 - 19 April 2026

Solar activity was at very low to low levels during the period. Very
low levels occurred on 14, 15 and 19 Apr, while low levels were
observed on 13, 16, 17 and 18 April. 

Region 4419 (N14, L=314, class/area=Eki/360 on 17 Apr) was the most
active region of the period, responsible for 5 out of the 7 C-class
flares observed during the week, including the largest one: a
C4.1/Sf at 17/0442 UTC. The remainder 2 C-class flares of the period
were: a C1.1/Sf at 13/1137 UTC from Region 4414 (N15, L=026,
class/area=Dro/030 on 08 Apr) and a C1.6 at 18/0704 UTC from Region
4416 (N19, L=047, class/area=Dai/140 on 12 Apr). Coronal activity
was observed during the week with some filament eruptions and few
CMEs without 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 on 13-17 Apr, followed by a day at moderate levels on 18
Apr and returning to high levels on 19 Apr, with a maximum flux of
3,250 pfu observed at 15/1800 UTC. 

Geomagnetic field activity was quiet to Moderate storm levels during
the period. From 13 to 17 Apr, the geomagnetic activity remained at
quiet levels. On 18 Apr, the arrival of a negative polarity CH HSS
influence disturbed the Geospace, elevating the activity from
unsettled to Moderate storm levels. On 19 Apr, Moderate storm levels
were observed during an isolated synoptic period (0600-0900 UTC) and
the geomagnetic activity returned to quiet level by the end of the
day as the CH HSS effects waned. 

Forecast of Solar and Geomagnetic Activity
20 April - 16 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 16 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 20-22 Apr, 27-28 Apr, 30 Apr-05 May
and 08-14 May. Normal to moderate electron flux levels are expected
on 23-26 Apr, 29 Apr, 06-07 May and 15-16 May. 

Geomagnetic field activity is expected to remain at quiet to active
levels during most of the outlook period, with the exception of 5
days when G1 (Minor) storm levels are anticipated due to the
recurrent influence of CH HSS: 29-30 Apr (-CH HSS), 07 May (+CH HSS)
and 15-16 May (-CH HSS).