Report of Solar Geophysical Activity (RSGA)

By Newsroom America Feeds at 4 Dec 2017

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 338 Issued at 2200Z on 04 Dec 2017

IA. Analysis of Solar Active Regions and Activity from 03/2100Z to 04/2100Z: 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 (05 Dec, 06 Dec, 07 Dec).

IIA. Geophysical Activity Summary 03/2100Z to 04/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 381 km/s at 04/2020Z. Total IMF reached 12 nT at 04/1653Z. The maximum southward component of Bz reached -12 nT at 04/1652Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 175 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at unsettled to major storm levels on day one (05 Dec), unsettled to minor storm levels on day two (06 Dec) and quiet to active levels on day three (07 Dec).

III. Event probabilities 05 Dec-07 Dec Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green

IV. Penticton 10.7 cm Flux Observed 04 Dec 068 Predicted 05 Dec-07 Dec 068/068/068 90 Day Mean 04 Dec 078

V. Geomagnetic A Indices Observed Afr/Ap 03 Dec 001/001 Estimated Afr/Ap 04 Dec 012/016 Predicted Afr/Ap 05 Dec-07 Dec 026/034-014/018-010/012

VI. Geomagnetic Activity Probabilities 05 Dec-07 Dec A. Middle Latitudes Active 35/35/25 Minor Storm 35/20/10 Major-severe storm 15/05/01 B. High Latitudes Active 05/10/15 Minor Storm 20/25/25 Major-severe storm 70/55/35

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