:Product: 1208RSGA.txt :Issued: 2025 Dec 08 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 342 Issued at 2200Z on 08 Dec 2025 IA. Analysis of Solar Active Regions and Activity from 07/2100Z to 08/2100Z: Solar activity has been at high levels for the past 24 hours. There are currently 8 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is likely to be moderate with a slight chance for an X-class flare on days one, two, and three (09 Dec, 10 Dec, 11 Dec). IIA. Geophysical Activity Summary 07/2100Z to 08/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 594 km/s at 08/1918Z. Total IMF reached 7 nT at 07/2210Z. The maximum southward component of Bz reached -4 nT at 08/2055Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1039 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at active to severe storm levels on day one (09 Dec), quiet to minor storm levels on day two (10 Dec) and quiet to unsettled levels on day three (11 Dec). Protons have a slight chance of crossing threshold on days one, two, and three (09 Dec, 10 Dec, 11 Dec). III. Event probabilities 09 Dec-11 Dec Class M 65/65/65 Class X 15/15/15 Proton 15/15/15 PCAF green IV. Penticton 10.7 cm Flux Observed 08 Dec 186 Predicted 09 Dec-11 Dec 190/185/175 90 Day Mean 08 Dec 149 V. Geomagnetic A Indices Observed Afr/Ap 07 Dec 005/009 Estimated Afr/Ap 08 Dec 013/018 Predicted Afr/Ap 09 Dec-11 Dec 044/066-022/033-007/010 VI. Geomagnetic Activity Probabilities 09 Dec-11 Dec A. Middle Latitudes Active 20/35/20 Minor Storm 30/35/05 Major-severe storm 50/20/01 B. High Latitudes Active 05/05/15 Minor Storm 15/20/25 Major-severe storm 85/75/25