:Product: 0426RSGA.txt :Issued: 2026 Apr 26 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 116 Issued at 2200Z on 26 Apr 2026 IA. Analysis of Solar Active Regions and Activity from 25/2100Z to 26/2100Z: Solar activity has been at moderate levels for the past 24 hours. There are currently 7 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is likely to be moderate with a slight chance for an X-class flare on days one, two, and three (27 Apr, 28 Apr, 29 Apr). IIA. Geophysical Activity Summary 25/2100Z to 26/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 527 km/s at 26/0848Z. Total IMF reached 14 nT at 26/0318Z. The maximum southward component of Bz reached -13 nT at 26/0318Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 572 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (27 Apr), quiet levels on day two (28 Apr) and quiet to unsettled levels on day three (29 Apr). Protons have a slight chance of crossing threshold on days one, two, and three (27 Apr, 28 Apr, 29 Apr). III. Event probabilities 27 Apr-29 Apr Class M 55/55/55 Class X 15/15/15 Proton 10/10/10 PCAF green IV. Penticton 10.7 cm Flux Observed 26 Apr 156 Predicted 27 Apr-29 Apr 155/150/150 90 Day Mean 26 Apr 129 V. Geomagnetic A Indices Observed Afr/Ap 25 Apr 007/009 Estimated Afr/Ap 26 Apr 012/016 Predicted Afr/Ap 27 Apr-29 Apr 010/012-006/006-007/010 VI. Geomagnetic Activity Probabilities 27 Apr-29 Apr A. Middle Latitudes Active 30/10/15 Minor Storm 05/01/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/20/20 Minor Storm 35/20/20 Major-severe storm 35/10/20