:Product: 0128RSGA.txt :Issued: 2026 Jan 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 28 Issued at 2200Z on 28 Jan 2026 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 day one (29 Jan) and expected to be low with a slight chance for an M-class flare on days two and three (30 Jan, 31 Jan). IIA. Geophysical Activity Summary 27/2100Z to 28/2100Z: The geomagnetic field has been at unsettled to active levels for the past 24 hours. Solar wind speed reached a peak of 768 km/s at 28/1010Z. Total IMF reached 13 nT at 28/1703Z. The maximum southward component of Bz reached -12 nT at 28/1522Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 10382 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (29 Jan) and quiet to unsettled levels on days two and three (30 Jan, 31 Jan). III. Event probabilities 29 Jan-31 Jan Class M 25/10/10 Class X 05/01/01 Proton 05/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 28 Jan 133 Predicted 29 Jan-31 Jan 130/120/110 90 Day Mean 28 Jan 150 V. Geomagnetic A Indices Observed Afr/Ap 27 Jan 007/010 Estimated Afr/Ap 28 Jan 018/022 Predicted Afr/Ap 29 Jan-31 Jan 013/018-008/010-008/008 VI. Geomagnetic Activity Probabilities 29 Jan-31 Jan A. Middle Latitudes Active 35/25/25 Minor Storm 20/10/10 Major-severe storm 05/01/01 B. High Latitudes Active 10/15/15 Minor Storm 30/25/25 Major-severe storm 50/35/35