:Product: 0319RSGA.txt :Issued: 2026 Mar 19 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 78 Issued at 2200Z on 19 Mar 2026 IA. Analysis of Solar Active Regions and Activity from 18/2100Z to 19/2100Z: Solar activity has been at 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 (20 Mar, 21 Mar, 22 Mar). IIA. Geophysical Activity Summary 18/2100Z to 19/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 428 km/s at 18/2352Z. Total IMF reached 6 nT at 19/0905Z. The maximum southward component of Bz reached -2 nT at 19/1408Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 4941 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at unsettled to major storm levels on day one (20 Mar), active to major storm levels on day two (21 Mar) and unsettled to minor storm levels on day three (22 Mar). III. Event probabilities 20 Mar-22 Mar Class M 15/15/15 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 19 Mar 106 Predicted 20 Mar-22 Mar 105/105/100 90 Day Mean 19 Mar 142 V. Geomagnetic A Indices Observed Afr/Ap 18 Mar 004/005 Estimated Afr/Ap 19 Mar 009/013 Predicted Afr/Ap 20 Mar-22 Mar 027/044-035/050-020/030 VI. Geomagnetic Activity Probabilities 20 Mar-22 Mar A. Middle Latitudes Active 25/25/45 Minor Storm 35/35/30 Major-severe storm 30/35/05 B. High Latitudes Active 05/05/05 Minor Storm 15/15/20 Major-severe storm 75/79/70