:Product: 1201RSGA.txt :Issued: 2025 Dec 01 2230 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 335 Issued at 2200Z on 01 Dec 2025 IA. Analysis of Solar Active Regions and Activity from 30/2100Z to 01/2100Z: Solar activity has been at high levels for the past 24 hours. There are currently 9 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is expected to be moderate with a chance for X-class flares on day one (02 Dec) and likely to be moderate with a chance for X-class flares on days two and three (03 Dec, 04 Dec). IIA. Geophysical Activity Summary 30/2100Z to 01/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 626 km/s at 30/2317Z. Total IMF reached 6 nT at 01/1639Z. The maximum southward component of Bz reached -5 nT at 30/2311Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 8521 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on day one (02 Dec), quiet to major storm levels on day two (03 Dec) and active to major storm levels on day three (04 Dec). Protons have a chance of crossing threshold on day one (02 Dec), have a slight chance of crossing threshold on day two (03 Dec) and have a slight chance of crossing threshold on day three (04 Dec). III. Event probabilities 02 Dec-04 Dec Class M 80/70/70 Class X 30/30/25 Proton 25/20/10 PCAF green IV. Penticton 10.7 cm Flux Observed 01 Dec 196 Predicted 02 Dec-04 Dec 195/195/200 90 Day Mean 01 Dec 145 V. Geomagnetic A Indices Observed Afr/Ap 30 Nov 014/016 Estimated Afr/Ap 01 Dec 010/012 Predicted Afr/Ap 02 Dec-04 Dec 005/005-018/024-025/035 VI. Geomagnetic Activity Probabilities 02 Dec-04 Dec A. Middle Latitudes Active 10/40/35 Minor Storm 01/20/25 Major-severe storm 01/05/05 B. High Latitudes Active 15/10/10 Minor Storm 20/25/25 Major-severe storm 15/60/65