:Product: 1230RSGA.txt :Issued: 2025 Dec 30 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 364 Issued at 2200Z on 30 Dec 2025 IA. Analysis of Solar Active Regions and Activity from 29/2100Z to 30/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 9 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is likely to be moderate with a chance for X-class flares on days one, two, and three (31 Dec, 01 Jan, 02 Jan). IIA. Geophysical Activity Summary 29/2100Z to 30/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 563 km/s at 30/1514Z. Total IMF reached 9 nT at 30/1503Z. The maximum southward component of Bz reached -6 nT at 30/1515Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 5,612 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (31 Dec), unsettled to minor storm levels on day two (01 Jan) and unsettled to active levels on day three (02 Jan). Protons have a slight chance of crossing threshold on days one, two, and three (31 Dec, 01 Jan, 02 Jan). III. Event probabilities 31 Dec-02 Jan Class M 60/60/60 Class X 25/25/25 Proton 15/15/15 PCAF green IV. Penticton 10.7 cm Flux Observed 30 Dec 182 Predicted 31 Dec-02 Jan 200/200/195 90 Day Mean 30 Dec 146 V. Geomagnetic A Indices Observed Afr/Ap 29 Dec 009/009 Estimated Afr/Ap 30 Dec 008/009 Predicted Afr/Ap 31 Dec-02 Jan 011/012-021/029-013/018 VI. Geomagnetic Activity Probabilities 31 Dec-02 Jan A. Middle Latitudes Active 30/45/35 Minor Storm 10/25/15 Major-severe storm 01/05/01 B. High Latitudes Active 15/10/15 Minor Storm 30/25/30 Major-severe storm 40/70/45