:Product: 1228RSGA.txt :Issued: 2025 Dec 28 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 362 Issued at 2200Z on 28 Dec 2025 IA. Analysis of Solar Active Regions and Activity from 27/2100Z to 28/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 10 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is expected to be low with a chance for M-class flares and a slight chance for an X-class flare on days one, two, and three (29 Dec, 30 Dec, 31 Dec). IIA. Geophysical Activity Summary 27/2100Z to 28/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 604 km/s at 28/1526Z. Total IMF reached 7 nT at 28/0913Z. The maximum southward component of Bz reached -5 nT at 28/0901Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 8999 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one, two, and three (29 Dec, 30 Dec, 31 Dec). Protons have a slight chance of crossing threshold on days one, two, and three (29 Dec, 30 Dec, 31 Dec). III. Event probabilities 29 Dec-31 Dec Class M 45/45/45 Class X 10/10/10 Proton 10/10/10 PCAF green IV. Penticton 10.7 cm Flux Observed 28 Dec 188 Predicted 29 Dec-31 Dec 185/175/170 90 Day Mean 28 Dec 146 V. Geomagnetic A Indices Observed Afr/Ap 27 Dec 005/007 Estimated Afr/Ap 28 Dec 006/007 Predicted Afr/Ap 29 Dec-31 Dec 006/005-005/005-007/008 VI. Geomagnetic Activity Probabilities 29 Dec-31 Dec A. Middle Latitudes Active 10/10/20 Minor Storm 01/01/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 20/20/25 Major-severe storm 10/10/30