:Product: 0526RSGA.txt :Issued: 2019 May 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 146 Issued at 2200Z on 26 May 2019 IA. Analysis of Solar Active Regions and Activity from 25/2100Z to 26/2100Z: Solar activity has been at very low levels for the past 24 hours. There are currently 0 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is expected to be very low on days one, two, and three (27 May, 28 May, 29 May). IIA. Geophysical Activity Summary 25/2100Z to 26/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 340 km/s at 26/1101Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 117 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on day one (27 May), quiet to active levels on day two (28 May) and unsettled to active levels on day three (29 May). III. Event probabilities 27 May-29 May Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 26 May 068 Predicted 27 May-29 May 067/067/067 90 Day Mean 26 May 072 V. Geomagnetic A Indices Observed Afr/Ap 25 May 003/004 Estimated Afr/Ap 26 May 004/005 Predicted Afr/Ap 27 May-29 May 006/005-010/012-015/018 VI. Geomagnetic Activity Probabilities 27 May-29 May A. Middle Latitudes Active 05/25/35 Minor Storm 01/05/15 Major-severe storm 01/01/05 B. High Latitudes Active 15/20/15 Minor Storm 15/30/35 Major-severe storm 10/25/40