:Product: 0728RSGA.txt :Issued: 2025 Jul 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 209 Issued at 2200Z on 28 Jul 2025 IA. Analysis of Solar Active Regions and Activity from 27/2100Z to 28/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 10 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 (29 Jul, 30 Jul, 31 Jul). IIA. Geophysical Activity Summary 27/2100Z to 28/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 496 km/s at 28/0617Z. Total IMF reached 6 nT at 28/1344Z. The maximum southward component of Bz reached -4 nT at 28/1718Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1872 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on day one (29 Jul) and quiet to active levels on days two and three (30 Jul, 31 Jul). III. Event probabilities 29 Jul-31 Jul Class M 25/30/30 Class X 05/05/05 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 28 Jul 145 Predicted 29 Jul-31 Jul 145/140/140 90 Day Mean 28 Jul 135 V. Geomagnetic A Indices Observed Afr/Ap 27 Jul 007/ 005 Estimated Afr/Ap 28 Jul 006/007 Predicted Afr/Ap 29 Jul-31 Jul 006/008-009/012-010/012 VI. Geomagnetic Activity Probabilities 29 Jul-31 Jul A. Middle Latitudes Active 15/30/30 Minor Storm 05/15/10 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 25/30/30 Major-severe storm 25/40/40