Report of Solar Geophysical Activity (RSGA)

By Newsroom America Feeds at 28 Dec 2017

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 362 Issued at 2200Z on 28 Dec 2017

IA. Analysis of Solar Active Regions and Activity from 27/2100Z to 28/2100Z: 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 (29 Dec, 30 Dec, 31 Dec).

IIA. Geophysical Activity Summary 27/2100Z to 28/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 452 km/s at 28/0112Z. Total IMF reached 8 nT at 27/2112Z. The maximum southward component of Bz reached -5 nT at 27/2214Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1545 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one and two (29 Dec, 30 Dec) and quiet to active levels on day three (31 Dec).

III. Event probabilities 29 Dec-31 Dec Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green

IV. Penticton 10.7 cm Flux Observed 28 Dec 071 Predicted 29 Dec-31 Dec 070/070/070 90 Day Mean 28 Dec 074

V. Geomagnetic A Indices Observed Afr/Ap 27 Dec 006/005 Estimated Afr/Ap 28 Dec 007/006 Predicted Afr/Ap 29 Dec-31 Dec 005/005-006/005-008/010

VI. Geomagnetic Activity Probabilities 29 Dec-31 Dec A. Middle Latitudes Active 10/10/25 Minor Storm 05/01/10 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 15/15/30 Major-severe storm 15/10/35

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