:Product: 1219RSGA.txt :Issued: 2025 Dec 19 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 353 Issued at 2200Z on 19 Dec 2025 IA. Analysis of Solar Active Regions and Activity from 18/2100Z to 19/2100Z: Solar activity has been at moderate levels for the past 24 hours. There are currently 3 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is likely to be low on days one, two, and three (20 Dec, 21 Dec, 22 Dec). IIA. Geophysical Activity Summary 18/2100Z to 19/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 906 km/s at 18/2313Z. Total IMF reached 5 nT at 19/0537Z. The maximum southward component of Bz reached -4 nT at 19/0054Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 3239 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on day one (20 Dec), quiet levels on day two (21 Dec) and quiet to minor storm levels on day three (22 Dec). III. Event probabilities 20 Dec-22 Dec Class M 05/05/05 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 19 Dec 118 Predicted 20 Dec-22 Dec 118/116/116 90 Day Mean 19 Dec 149 V. Geomagnetic A Indices Observed Afr/Ap 18 Dec 011/017 Estimated Afr/Ap 19 Dec 006/007 Predicted Afr/Ap 20 Dec-22 Dec 008/008-005/005-014/018 VI. Geomagnetic Activity Probabilities 20 Dec-22 Dec A. Middle Latitudes Active 20/10/35 Minor Storm 05/01/30 Major-severe storm 01/01/10 B. High Latitudes Active 15/15/10 Minor Storm 25/20/25 Major-severe storm 25/10/65