:Product: Report of Solar-Geophysical Activity :Issued: 2026 Jul 31 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 212 Issued at 2200Z on 31 Jul 2026 IA. Analysis of Solar Active Regions and Activity from 30/2100Z to 31/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 8 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 (01 Aug, 02 Aug, 03 Aug). IIA. Geophysical Activity Summary 30/2100Z to 31/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 334 km/s at 31/1927Z. Total IMF reached 7 nT at 31/1953Z. The maximum southward component of Bz reached -4 nT at 31/0008Z. Protons greater than 10 MeV at geosynchronous orbit reached a peak level of 17 pfu at 30/2120Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 932 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and three (01 Aug, 03 Aug) and quiet to major storm levels on day two (02 Aug). Protons greater than 10 Mev have a chance of crossing threshold on day one (01 Aug) and have a slight chance of crossing threshold on day two (02 Aug). III. Event probabilities 01 Aug-03 Aug Class M 35/35/35 Class X 05/05/05 Proton 25/15/01 PCAF green IV. Penticton 10.7 cm Flux Observed 31 Jul 148 Predicted 01 Aug-03 Aug 145/140/140 90 Day Mean 31 Jul 133 V. Geomagnetic A Indices Observed Afr/Ap 30 Jul 008/005 Estimated Afr/Ap 31 Jul 007/009 Predicted Afr/Ap 01 Aug-03 Aug 010/014-020/027-011/012 VI. Geomagnetic Activity Probabilities 01 Aug-03 Aug A. Middle Latitudes Active 25/30/30 Minor Storm 05/35/15 Major-severe storm 01/15/05 B. High Latitudes Active 15/10/15 Minor Storm 20/20/30 Major-severe storm 20/50/40