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FXXX06 KWNP 080226
WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2025 Dec 08 0210 UTC
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#                7-day Space Weather Highlights
#
Highlights of Solar and Geomagnetic Activity
01 - 07 December 2025

Solar activity reached high levels this period. Region 4299 (N21,
L=268, class/area=Dai/220 on 07 Dec) produced an X1.9/1n flare at
01/0249 UTC; the strongest flare of the period. Other notable
activity included an M8.1/2b flare at 06/2039 UTC, also from Region
4299, which produced an full-halo CME that is expected to arrive
between late 08 Dec-midday 09 Dec. A CME, first visible in LASCO C2
imagery beginning at 04/0648 UTC off the SE, arrived at Earth late
on 07 Dec.

The greater than 10 MeV proton flux became elevated above background
levels late 06 Dec-late 07 Dec following the M8.1 flare at 06/2039
UTC from AR4299, but did not reach event levels.

The greater than 2 MeV electron flux at geosynchronous orbit was at
normal to moderate levels on 04 Dec, with high levels obserbed
throughout the remainder of the period.

Geomagnetic field activity reached active levels on 01 Dec in
response to positive polarity CH HSS influences. Quiet to unsettled
levels were observed on 02 Dec as CH HSS influences subsided.
Periods of G1-G3 (Minor-Moderate) geomagnetic storming were observed
on 03 Dec, with G1 storm periods observed on 04 Dec, due to CIR and
negative polarity CH HSS influences. Quiet and unsettled levels were
observed on 05 Dec, with active conditions observed on 06 Dec, as
negative polarity CH HSS influences waned. Active levels were
observed again on 07 Dec in response to the passage of a CME from 04
Dec.