:Product: 1213RSGA.txt :Issued: 2025 Dec 13 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 347 Issued at 2200Z on 13 Dec 2025 IA. Analysis of Solar Active Regions and Activity from 12/2100Z to 13/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 5 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 (14 Dec, 15 Dec, 16 Dec). IIA. Geophysical Activity Summary 12/2100Z to 13/2100Z: The geomagnetic field has been at quiet to minor storm levels for the past 24 hours. Solar wind speed reached a peak of 707 km/s at 13/1902Z. Total IMF reached 17 nT at 13/0844Z. The maximum southward component of Bz reached -14 nT at 12/2102Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 342 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (14 Dec) and quiet to unsettled levels on days two and three (15 Dec, 16 Dec). III. Event probabilities 14 Dec-16 Dec Class M 30/25/25 Class X 01/01/01 Proton 05/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 13 Dec 122 Predicted 14 Dec-16 Dec 120/120/120 90 Day Mean 13 Dec 151 V. Geomagnetic A Indices Observed Afr/Ap 12 Dec 019/028 Estimated Afr/Ap 13 Dec 011/014 Predicted Afr/Ap 14 Dec-16 Dec 010/012-010/010-008/008 VI. Geomagnetic Activity Probabilities 14 Dec-16 Dec A. Middle Latitudes Active 35/20/15 Minor Storm 20/05/05 Major-severe storm 05/01/01 B. High Latitudes Active 10/15/15 Minor Storm 30/25/25 Major-severe storm 50/30/25