Subject: Weekly Highlights of Solar and Geomagnetic Activity, 30 March - 05 April 2026

:Product: Weekly Highlights and Forecasts
:Issued: 2026 Apr 06 0211 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
30 March - 05 April 2026

Solar activity reached high levels on 30 Mar and 04 Apr, moderate
levels on 02-03 Apr, with low levels observed on 31 Mar, 01 Apr, and
5 Apr.

Region 4409 (N02, L=156, class/area=Eai/170 on 04 Apr) was the most
active of the period, producing 50 C-class flares and six M-class
flares. Region 4405 (S27, L=220, class/area=Eai/220 on 02 Apr) added
the strongest flare of the period, an X1.4/Sf flare, on 30 Mar at
0319 UTC. Accompanying the flare was a Type II radio sweep
(estimated velocity 1872 km/s) and a partial halo CME first seen in
LASCO C2 imagery at 30/0312 UTC. Expected impacts from this CME were
on 01 Apr. Region 4409 also produced a C8.1 flare at 01/1958 UTC.
Accompanying this flare was a filament eruption and subsequent CME
that had a likely Earth-directed trajectory with impacts likely felt
on 03-04 Apr.

Slightly elevated proton levels were observed from 01-05 Apr, but
conditions remained below alert thresholds throughout the period.

The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels throughout most of the period of 30 Mar - 05 Apr, with a
peak flux value of 6,000 pfu observed at 05/1645 UTC. The only
exception was on 02 Apr when conditions dropped to moderate levels
for that 24 hour reporting period.

Geomagnetic field activity ranged from quiet to G3 (Strong) storm
levels during the 30 Mar - 05 Apr period. Quiet to unsettled levels
were observed on 30 Mar - 01 Apr, and most of 05 Apr (aside from an
isolated active period at the beginning of the UT day). Conditions
increased to active to G2 (Moderate) levels on 02 Apr following the
onset of a negative polarity coronal hole high speed stream (CH
HSS). Conditions remained at active to G1 (Minor) levels through
midday on 03 Apr when they increased to G3 (Strong) levels with the
arrival of the anticipated CME from 01 Apr (C8.1 flare and filament
eruption). Conditions then decreased to G1 levels to start 04 Apr,
before decreasing to quiet to active conditions lasting through 05
Apr.

Forecast of Solar and Geomagnetic Activity
06 April - 02 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) flares from 06 Apr through 02 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 06-09 Apr, 11-16 Apr, and 18 Apr-02
May. Normal to moderate flux levels are expected on 10 and 17 Apr.

Geomagnetic field activity is anticipated to reach G1/G2
(Minor/Moderate) geomagnetic storm levels on 18-19, and 29 Apr due
to the influence of negative polarity CH HSS (-CH HSS). Periods of
G1 (Minor) storming are likely on 04 April in response to a negative
polarity CH HSS (-CH HSS). Unsettled to Active levels are expected
on 06-07 Apr, 20-22 Apr, and 30 Apr, as well as 01-02 May associated
with negative polarity CH HSS effects. On 10-13 and 25-26 April,
positive polarity CH HSS influences are expected to bump geomagnetic
conditions to unsettled to active levels. Mostly quiet levels are
expected during all other days of the period.


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