175
FXXX06 KWNP 250326
WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2025 Aug 25 0309 UTC
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#                7-day Space Weather Highlights
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Highlights of Solar and Geomagnetic Activity
18 - 24 August 2025

Solar activity was at low levels on 18, 20, and 21 Aug with only
C-class flares observed. Activity increased to moderate levels on 19
Aug following an M1.1 flare at 19/0439 UTC from an area beyond the
Eastern limb. Moderate levels were also observed on 22 Aug as Region
4191 (N11, L=172, class/area=Ehi/360 on 24 Aug) produced a
long-duration M1.7/Sf flare at 22/1851 UTC. Associated with this
flare was a Type II radio sweep with an estimated shock speed of 521
km/s. The associated CME was deemed to be behind the Sun-Earth line.
Moderate levels continued into 23 and 24 Aug with an M1.9 at 23/2006
UTC and an M1.3 flare at 24/0836 UTC, both originating from beyond
the NE limb. While multiple CMEs were observed in coronagraph
imagery over the period, nearly all were at or beyond the Eastern
limb and none were considered to have an Earth-directed component.

The greater than 10 MeV proton flux at geosynchronous orbit was at
background levels from 18-22 Aug. Beginning around midday on 22 Aug,
flux levels began to rise following the long-duration M1.7 flare
event, mentioned above. Levels continued to rise, eventually
reaching a peak of 8.3 pfu at 24/2330 UTC, but never exceeded the
greater than 10 pfu levels.

The greater than 2 MeV electron flux at geosynchronous orbit was at
normal to moderate levels on 19-20 Aug, and 22-23 Aug. Activity
reached high levels on 18, 21, and 24 Aug, with the peak observed
value of 2,200 pfu at 18/0830 UTC.

Geomagnetic field activity was at quiet to unsettled levels on 18
and 24 Aug, bookending a negative polarity coronal hole high speed
stream. Unsettled to active conditions were observed on 20-23 Aug as
CH HSS activity elevated, with active to minor storm levels observed
on 19 Aug.