:Product: 0525RSGA.txt :Issued: 2018 May 25 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 145 Issued at 2200Z on 25 May 2018 IA. Analysis of Solar Active Regions and Activity from 24/2100Z to 25/2100Z: Solar activity has been at very 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 (26 May, 27 May, 28 May). IIA. Geophysical Activity Summary 24/2100Z to 25/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 449 km/s at 24/2211Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 197 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one and two (26 May, 27 May) and quiet to unsettled levels on day three (28 May). III. Event probabilities 26 May-28 May Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 25 May 076 Predicted 26 May-28 May 075/075/073 90 Day Mean 25 May 069 V. Geomagnetic A Indices Observed Afr/Ap 24 May 005/004 Estimated Afr/Ap 25 May 004/004 Predicted Afr/Ap 26 May-28 May 005/005-005/005-008/008 VI. Geomagnetic Activity Probabilities 26 May-28 May A. Middle Latitudes Active 05/05/15 Minor Storm 01/01/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 15/15/25 Major-severe storm 05/05/25