:Product: 1225RSGA.txt
:Issued: 2025 Dec 25 2200 UTC
# Prepared jointly by the U.S. Dept. of Commerce, NOAA,
# Space Weather Prediction Center and the U.S. Air Force.
#
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 359 Issued at 2200Z on 25 Dec 2025

IA.  Analysis of Solar Active Regions and Activity from 24/2100Z to
25/2100Z: Solar activity has been at low levels for the past 24 hours.
There are currently 8 numbered sunspot regions on the disk.
IB.  Solar Activity Forecast: Solar activity is expected to be low with
a chance for M-class flares on days one, two, and three (26 Dec, 27 Dec,
28 Dec).

IIA.  Geophysical Activity Summary 24/2100Z to 25/2100Z: The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 663 km/s at 24/2112Z. Total IMF reached 6
nT at 25/2007Z. The maximum southward component of Bz reached -5 nT at
24/2355Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 8651 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to unsettled levels on day one (26 Dec) and quiet levels
on days two and three (27 Dec, 28 Dec).

III.  Event probabilities 26 Dec-28 Dec
Class M    45/45/45
Class X    05/05/05
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           25 Dec 163
Predicted   26 Dec-28 Dec 165/170/175
90 Day Mean        25 Dec 146

V.  Geomagnetic A Indices
Observed Afr/Ap 24 Dec  019/021
Estimated Afr/Ap 25 Dec  010/012
Predicted Afr/Ap 26 Dec-28 Dec  008/010-006/005-005/005

VI.  Geomagnetic Activity Probabilities 26 Dec-28 Dec
A.  Middle Latitudes
Active                15/10/10
Minor Storm           05/01/01
Major-severe storm    01/01/01
B.  High Latitudes
Active                15/15/15
Minor Storm           25/20/20
Major-severe storm    25/10/10
