:Product: 0411RSGA.txt :Issued: 2026 Apr 11 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 101 Issued at 2200Z on 11 Apr 2026 IA. Analysis of Solar Active Regions and Activity from 10/2100Z to 11/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 3 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 (12 Apr, 13 Apr, 14 Apr). IIA. Geophysical Activity Summary 10/2100Z to 11/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 653 km/s at 10/2158Z. Total IMF reached 11 nT at 11/0531Z. The maximum southward component of Bz reached -6 nT at 11/0509Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1081 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and three (12 Apr, 14 Apr) and quiet to unsettled levels on day two (13 Apr). III. Event probabilities 12 Apr-14 Apr Class M 10/10/10 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 11 Apr 093 Predicted 12 Apr-14 Apr 095/095/090 90 Day Mean 11 Apr 136 V. Geomagnetic A Indices Observed Afr/Ap 10 Apr 016/018 Estimated Afr/Ap 11 Apr 015/019 Predicted Afr/Ap 12 Apr-14 Apr 010/012-008/008-009/012 VI. Geomagnetic Activity Probabilities 12 Apr-14 Apr A. Middle Latitudes Active 30/15/35 Minor Storm 15/05/10 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 30/25/30 Major-severe storm 45/25/45