Report of Solar Geophysical Activity (RSGA)

By Newsroom America Feeds at 4 Apr 2018

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 94 Issued at 2200Z on 04 Apr 2018

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 Apr, 06 Apr, 07 Apr).

IIA. Geophysical Activity Summary 03/2100Z to 04/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 361 km/s at 03/2106Z. Total IMF reached 5 nT at 04/0718Z. The maximum southward component of Bz reached -4 nT at 04/0929Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1796 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on days one and two (05 Apr, 06 Apr) and quiet levels on day three (07 Apr).

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

IV. Penticton 10.7 cm Flux Observed 04 Apr 069 Predicted 05 Apr-07 Apr 069/069/069 90 Day Mean 04 Apr 070

V. Geomagnetic A Indices Observed Afr/Ap 03 Apr 003/003 Estimated Afr/Ap 04 Apr 005/005 Predicted Afr/Ap 05 Apr-07 Apr 008/010-007/008-006/005

VI. Geomagnetic Activity Probabilities 05 Apr-07 Apr A. Middle Latitudes Active 25/25/10 Minor Storm 05/05/01 Major-severe storm 01/01/01 B. High Latitudes Active 20/20/15 Minor Storm 30/30/15 Major-severe storm 25/25/15

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