:Product: 1223RSGA.txt :Issued: 2025 Dec 23 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 357 Issued at 2200Z on 23 Dec 2025 IA. Analysis of Solar Active Regions and Activity from 22/2100Z to 23/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 7 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 (24 Dec, 25 Dec, 26 Dec). IIA. Geophysical Activity Summary 22/2100Z to 23/2100Z: The geomagnetic field has been at unsettled to active levels for the past 24 hours. Solar wind speed reached a peak of 907 km/s at 23/1631Z. Total IMF reached 7 nT at 22/2307Z. The maximum southward component of Bz reached -5 nT at 23/1710Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 5557 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at unsettled to active levels on day one (24 Dec), quiet to active levels on day two (25 Dec) and quiet to unsettled levels on day three (26 Dec). III. Event probabilities 24 Dec-26 Dec Class M 30/40/45 Class X 05/05/05 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 23 Dec 142 Predicted 24 Dec-26 Dec 145/150/155 90 Day Mean 23 Dec 147 V. Geomagnetic A Indices Observed Afr/Ap 22 Dec 017/025 Estimated Afr/Ap 23 Dec 016/022 Predicted Afr/Ap 24 Dec-26 Dec 013/018-011/012-008/010 VI. Geomagnetic Activity Probabilities 24 Dec-26 Dec A. Middle Latitudes Active 35/30/15 Minor Storm 15/15/05 Major-severe storm 01/01/01 B. High Latitudes Active 10/10/15 Minor Storm 30/25/25 Major-severe storm 45/40/25