Subject: Weekly Highlights of Solar and Geomagnetic Activity, 19 - 25 January 2026

:Product: Weekly Highlights and Forecasts
:Issued: 2026 Jan 26 0257 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
19 - 25 January 2026

Solar activity reached moderate levels on 19 and 21 Jan with three
M-class flares (R1-Minor) observed. Region 4345 (S17, L=39,
class/area=Esi/160 on 24 Jan) produced an M1.1 flare at 19/1119 UTC
and an M1.1/Sf flare at 21/0135 UTC. Region 4349 (S14, L=336, class/area=Dso/230 on 25 Jan) produced an M3.4/1b flare at 21/0712
UTC, the strongest flare of the week. No Earth-directed CMEs were
observed in association with flare activity from 19-25 Jan.

The greater than 10 MeV proton flux reached S4 (Severe) storm levels
on 19 Jan, decreased to S2 (Moderate) levels on 20 Jan, and remained
at S1 (Minor) levels on 21-22 Jan following an X1.9/3b flare from
Region 4341 that peaked at 18/1809 UTC. Proton fluxes gradually
declined over 23-25 Jan.

The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels on 19 and 21-25 Jan, with normal to moderate levels
observed on 20 Jan.

Geomagnetic field activity reached G4 (Severe) storm levels on 19-20
Jan and G3 (Strong) levels on 21 Jan following the arrival of a halo
CME associated with the X1.9/3b flare at 18/1809 UTC from Region
4341. G1 (Minor) storming was observed on 22 Jan due to lingering
CME effects and the onset of positive polarity CH HSS influences.
Active conditions were observed on 23-24 Jan, with quiet to
unsettled levels observed on 25 Jan, in response to continued
positive polarity CH HSS influences.

Forecast of Solar and Geomagnetic Activity
26 January - 21 February 2026

Solar activity is expected to be predominately low with a varying
chance for M-class flares (R1-R2/Minor-Moderate) through 21 Feb.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to reach high levels on 26, 28-31 Jan and 01-03, 06-12,
15-21 Feb. Normal to moderate flux levels are expected to persist
through the remainder of the period.

Geomagnetic field activity is likely to reach G1 (Minor) storm
levels on 28 Jan and 13 Feb, with active periods likely on 29 Jan
and 04-05, 14-21 Feb, due to the influences of multiple, recurrent
CH HSSs. Quiet and quiet-to-unsettled conditions are expected to
prevail throughout the remainder of the outlook period.


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