:Product: 0410RSGA.txt :Issued: 2026 Apr 10 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 100 Issued at 2200Z on 10 Apr 2026 IA. Analysis of Solar Active Regions and Activity from 09/2100Z to 10/2100Z: Solar activity has been at very low levels for the past 24 hours. There are currently 3 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 (11 Apr, 12 Apr, 13 Apr). IIA. Geophysical Activity Summary 09/2100Z to 10/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 701 km/s at 10/2044Z. Total IMF reached 14 nT at 10/0723Z. The maximum southward component of Bz reached -9 nT at 10/1219Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1713 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at unsettled to minor storm levels on day one (11 Apr), quiet to active levels on day two (12 Apr) and quiet to unsettled levels on day three (13 Apr). III. Event probabilities 11 Apr-13 Apr Class M 05/05/05 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 10 Apr 094 Predicted 11 Apr-13 Apr 092/090/090 90 Day Mean 10 Apr 136 V. Geomagnetic A Indices Observed Afr/Ap 09 Apr 006/007 Estimated Afr/Ap 10 Apr 019/022 Predicted Afr/Ap 11 Apr-13 Apr 018/025-012/015-010/010 VI. Geomagnetic Activity Probabilities 11 Apr-13 Apr A. Middle Latitudes Active 35/30/15 Minor Storm 25/15/05 Major-severe storm 05/01/01 B. High Latitudes Active 10/15/15 Minor Storm 20/30/25 Major-severe storm 55/45/25