Report of Solar Geophysical Activity (RSGA)

By Newsroom America Feeds at 12 Apr 18:01

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 102 Issued at 2200Z on 12 Apr 2018

IA. Analysis of Solar Active Regions and Activity from 11/2100Z to 12/2100Z: 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 (13 Apr, 14 Apr, 15 Apr).

IIA. Geophysical Activity Summary 11/2100Z to 12/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 557 km/s at 12/1016Z. Total IMF reached 6 nT at 12/0959Z. The maximum southward component of Bz reached -5 nT at 12/0956Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 22185 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and two (13 Apr, 14 Apr) and quiet to unsettled levels on day three (15 Apr).

III. Event probabilities 13 Apr-15 Apr Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green

IV. Penticton 10.7 cm Flux Observed 12 Apr 070 Predicted 13 Apr-15 Apr 070/070/070 90 Day Mean 12 Apr 070

V. Geomagnetic A Indices Observed Afr/Ap 11 Apr 012/014 Estimated Afr/Ap 12 Apr 011/014 Predicted Afr/Ap 13 Apr-15 Apr 012/015-010/012-007/008

VI. Geomagnetic Activity Probabilities 13 Apr-15 Apr A. Middle Latitudes Active 40/30/25 Minor Storm 20/10/10 Major-severe storm 05/01/01 B. High Latitudes Active 10/15/15 Minor Storm 30/25/25 Major-severe storm 50/35/30

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