:Product: 0527RSGA.txt :Issued: 2026 May 27 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 147 Issued at 2200Z on 27 May 2026 IA. Analysis of Solar Active Regions and Activity from 26/2100Z to 27/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 11 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is expected to be low with a chance for M-class flares on days one, two, and three (28 May, 29 May, 30 May). IIA. Geophysical Activity Summary 26/2100Z to 27/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 445 km/s at 26/2100Z. Total IMF reached 7 nT at 26/2122Z. The maximum southward component of Bz reached -7 nT at 26/2124Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 403 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (28 May), quiet to unsettled levels on day two (29 May) and quiet levels on day three (30 May). III. Event probabilities 28 May-30 May Class M 40/40/40 Class X 05/05/05 Proton 05/05/05 PCAF green IV. Penticton 10.7 cm Flux Observed 27 May 142 Predicted 28 May-30 May 145/142/145 90 Day Mean 27 May 125 V. Geomagnetic A Indices Observed Afr/Ap 26 May 007/008 Estimated Afr/Ap 27 May 009/011 Predicted Afr/Ap 28 May-30 May 010/012-009/010-006/006 VI. Geomagnetic Activity Probabilities 28 May-30 May A. Middle Latitudes Active 30/20/15 Minor Storm 10/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 20/20/20 Minor Storm 35/25/30 Major-severe storm 35/25/20