:Product: 1219RSGA.txt :Issued: 2019 Dec 18 2215 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 352 Issued at 2200Z on 19 Dec 2019 IA. Analysis of Solar Active Regions and Activity from 17/2100Z to 18/2100Z: 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 (19 Dec, 20 Dec, 21 Dec). IIA. Geophysical Activity Summary 17/2100Z to 18/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 578 km/s at 18/1929Z. Total IMF reached 12 nT at 18/1025Z. The maximum southward component of Bz reached -10 nT at 18/1029Z. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (19 Dec) and quiet to unsettled levels on days two and three (20 Dec, 21 Dec). III. Event probabilities 19 Dec-21 Dec Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 18 Dec 070 Predicted 19 Dec-21 Dec 070/070/070 90 Day Mean 18 Dec 069 V. Geomagnetic A Indices Observed Afr/Ap 17 Dec 002/002 Estimated Afr/Ap 18 Dec 010/012 Predicted Afr/Ap 19 Dec-21 Dec 010/010-008/008-008/008 VI. Geomagnetic Activity Probabilities 19 Dec-21 Dec A. Middle Latitudes Active 30/20/20 Minor Storm 05/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 30/30/30 Major-severe storm 35/25/25