Report of Solar Geophysical Activity (RSGA)

By Newsroom America Feeds at 8 Apr 2018

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 98 Issued at 2200Z on 08 Apr 2018

IA. Analysis of Solar Active Regions and Activity from 07/2100Z to 08/2100Z: 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 (09 Apr, 10 Apr, 11 Apr).

IIA. Geophysical Activity Summary 07/2100Z to 08/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 392 km/s at 07/2245Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 488 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on day one (09 Apr) and quiet to minor storm levels on days two and three (10 Apr, 11 Apr).

III. Event probabilities 09 Apr-11 Apr Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green

IV. Penticton 10.7 cm Flux Observed 08 Apr 068 Predicted 09 Apr-11 Apr 067/067/067 90 Day Mean 08 Apr 070

V. Geomagnetic A Indices Observed Afr/Ap 07 Apr 004/004 Estimated Afr/Ap 08 Apr 004/005 Predicted Afr/Ap 09 Apr-11 Apr 008/008-015/018-014/018

VI. Geomagnetic Activity Probabilities 09 Apr-11 Apr A. Middle Latitudes Active 15/40/40 Minor Storm 05/25/25 Major-severe storm 01/05/05 B. High Latitudes Active 15/10/10 Minor Storm 25/30/30 Major-severe storm 25/55/55


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