:Product: 0320RSGA.txt :Issued: 2026 Mar 20 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 79 Issued at 2200Z on 20 Mar 2026 IA. Analysis of Solar Active Regions and Activity from 19/2100Z to 20/2100Z: Solar activity has been at very low levels for the past 24 hours. There are currently 2 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is likely to be low with a slight chance for an M-class flare on days one, two, and three (21 Mar, 22 Mar, 23 Mar). IIA. Geophysical Activity Summary 19/2100Z to 20/2100Z: The geomagnetic field has been at quiet to major storm levels for the past 24 hours. Solar wind speed reached a peak of 567 km/s at 20/2021Z. Total IMF reached 36 nT at 20/2100Z. The maximum southward component of Bz reached -22 nT at 20/2042Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 2623 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at unsettled to severe storm levels on day one (21 Mar), unsettled to minor storm levels on day two (22 Mar) and quiet to active levels on day three (23 Mar). III. Event probabilities 21 Mar-23 Mar Class M 10/10/10 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 20 Mar 102 Predicted 21 Mar-23 Mar 102/100/100 90 Day Mean 20 Mar 141 V. Geomagnetic A Indices Observed Afr/Ap 19 Mar 003/003 Estimated Afr/Ap 20 Mar 020/034 Predicted Afr/Ap 21 Mar-23 Mar 032/055-020/030-015/016 VI. Geomagnetic Activity Probabilities 21 Mar-23 Mar A. Middle Latitudes Active 15/45/40 Minor Storm 35/30/15 Major-severe storm 50/05/01 B. High Latitudes Active 05/05/10 Minor Storm 10/20/25 Major-severe storm 85/70/55