:Product: 0420RSGA.txt :Issued: 2026 Apr 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 110 Issued at 2200Z on 20 Apr 2026 IA. Analysis of Solar Active Regions and Activity from 19/2100Z to 20/2100Z: 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 expected to be very low with a chance for a C-class flares on days one, two, and three (21 Apr, 22 Apr, 23 Apr). IIA. Geophysical Activity Summary 19/2100Z to 20/2100Z: The geomagnetic field has been at quiet to minor storm levels for the past 24 hours. Solar wind speed reached a peak of 582 km/s at 20/1427Z. Total IMF reached 11 nT at 20/1354Z. The maximum southward component of Bz reached -8 nT at 20/1639Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1296 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (21 Apr), quiet to unsettled levels on day two (22 Apr) and quiet levels on day three (23 Apr). III. Event probabilities 21 Apr-23 Apr Class M 05/05/05 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 20 Apr 105 Predicted 21 Apr-23 Apr 110/120/120 90 Day Mean 20 Apr 131 V. Geomagnetic A Indices Observed Afr/Ap 19 Apr 016/023 Estimated Afr/Ap 20 Apr 019/026 Predicted Afr/Ap 21 Apr-23 Apr 013/015-007/008-006/005 VI. Geomagnetic Activity Probabilities 21 Apr-23 Apr A. Middle Latitudes Active 30/20/15 Minor Storm 05/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 30/25/20 Major-severe storm 35/25/20