Report of Solar Geophysical Activity (RSGA)

By Newsroom America Feeds at 22 Dec 2017

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 356 Issued at 2200Z on 22 Dec 2017

IA. Analysis of Solar Active Regions and Activity from 21/2100Z to 22/2100Z: Solar activity has been at very low levels for the past 24 hours. There are currently 1 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is expected to be very low on days one, two, and three (23 Dec, 24 Dec, 25 Dec).

IIA. Geophysical Activity Summary 21/2100Z to 22/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 375 km/s at 22/0015Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 3000 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on day one (23 Dec) and quiet to active levels on days two and three (24 Dec, 25 Dec).

III. Event probabilities 23 Dec-25 Dec Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green

IV. Penticton 10.7 cm Flux Observed 22 Dec 075 Predicted 23 Dec-25 Dec 075/075/075 90 Day Mean 22 Dec 075

V. Geomagnetic A Indices Observed Afr/Ap 21 Dec 002/002 Estimated Afr/Ap 22 Dec 003/003 Predicted Afr/Ap 23 Dec-25 Dec 005/005-010/012-011/012

VI. Geomagnetic Activity Probabilities 23 Dec-25 Dec A. Middle Latitudes Active 10/30/30 Minor Storm 01/10/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/20 Minor Storm 15/30/35 Major-severe storm 10/40/35


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