:Product: 0410RSGA.txt :Issued: 2025 Apr 10 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 100 Issued at 2200Z on 10 Apr 2025 IA. Analysis of Solar Active Regions and Activity from 09/2100Z to 10/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 7 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 (11 Apr, 12 Apr, 13 Apr). IIA. Geophysical Activity Summary 09/2100Z to 10/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 556 km/s at 09/2330Z. Total IMF reached 8 nT at 09/2131Z. The maximum southward component of Bz reached -8 nT at 09/2127Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 3319 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one, two, and three (11 Apr, 12 Apr, 13 Apr). III. Event probabilities 11 Apr-13 Apr Class M 45/45/45 Class X 05/05/05 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 10 Apr 153 Predicted 11 Apr-13 Apr 155/155/150 90 Day Mean 10 Apr 178 V. Geomagnetic A Indices Observed Afr/Ap 09 Apr 020/ 22 Estimated Afr/Ap 10 Apr 012/014 Predicted Afr/Ap 11 Apr-13 Apr 011/004-016/004-012/004 VI. Geomagnetic Activity Probabilities 11 Apr-13 Apr A. Middle Latitudes Active 30/35/30 Minor Storm 15/15/15 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 30/30/30 Major-severe storm 45/50/45