:Product: 0328RSGA.txt :Issued: 2025 Mar 28 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 87 Issued at 2200Z on 28 Mar 2025 IA. Analysis of Solar Active Regions and Activity from 27/2100Z to 28/2100Z: Solar activity has been at high levels for the past 24 hours. There are currently 6 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is expected to be low with a chance for M-class flares and a slight chance for an X-class flare on days one, two, and three (29 Mar, 30 Mar, 31 Mar). IIA. Geophysical Activity Summary 27/2100Z to 28/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 838 km/s at 27/2109Z. Total IMF reached 7 nT at 28/0727Z. The maximum southward component of Bz reached -5 nT at 28/0748Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 2818 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on days one and two (29 Mar, 30 Mar) and quiet levels on day three (31 Mar). III. Event probabilities 29 Mar-31 Mar Class M 50/50/50 Class X 20/20/20 Proton 05/05/05 PCAF green IV. Penticton 10.7 cm Flux Observed 28 Mar 160 Predicted 29 Mar-31 Mar 155/155/160 90 Day Mean 28 Mar 181 V. Geomagnetic A Indices Observed Afr/Ap 27 Mar 020/030 Estimated Afr/Ap 28 Mar 013/018 Predicted Afr/Ap 29 Mar-31 Mar 013/020-008/015-006/008 VI. Geomagnetic Activity Probabilities 29 Mar-31 Mar A. Middle Latitudes Active 20/10/10 Minor Storm 05/01/01 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/20 Minor Storm 25/20/25 Major-severe storm 25/20/15