:Product: 0426RSGA.txt :Issued: 2025 Apr 26 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 116 Issued at 2200Z on 26 Apr 2025 IA. Analysis of Solar Active Regions and Activity from 25/2100Z to 26/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 11 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 (27 Apr, 28 Apr, 29 Apr). IIA. Geophysical Activity Summary 25/2100Z to 26/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 603 km/s at 26/0717Z. Total IMF reached 8 nT at 26/2026Z. The maximum southward component of Bz reached -4 nT at 26/1451Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1008 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (27 Apr), quiet to unsettled levels on day two (28 Apr) and quiet levels on day three (29 Apr). III. Event probabilities 27 Apr-29 Apr Class M 25/25/25 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 26 Apr 156 Predicted 27 Apr-29 Apr 155/150/145 90 Day Mean 26 Apr 171 V. Geomagnetic A Indices Observed Afr/Ap 25 Apr 005/ 005 Estimated Afr/Ap 26 Apr 007/007 Predicted Afr/Ap 27 Apr-29 Apr 013/015-010/012-007/008 VI. Geomagnetic Activity Probabilities 27 Apr-29 Apr A. Middle Latitudes Active 35/30/30 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 50/45/45