Report of Solar Geophysical Activity (RSGA)

By Newsroom America Feeds at 16 Apr 18:01

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 106 Issued at 2200Z on 16 Apr 2018

IA. Analysis of Solar Active Regions and Activity from 15/2100Z to 16/2100Z: 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 (17 Apr, 18 Apr, 19 Apr).

IIA. Geophysical Activity Summary 15/2100Z to 16/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 318 km/s at 16/0549Z. Total IMF reached 5 nT at 16/0544Z. The maximum southward component of Bz reached -3 nT at 15/2316Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 6481 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one and two (17 Apr, 18 Apr) and quiet to active levels on day three (19 Apr).

III. Event probabilities 17 Apr-19 Apr Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green

IV. Penticton 10.7 cm Flux Observed 16 Apr 069 Predicted 17 Apr-19 Apr 070/070/070 90 Day Mean 16 Apr 070

V. Geomagnetic A Indices Observed Afr/Ap 15 Apr 005/006 Estimated Afr/Ap 16 Apr 003/004 Predicted Afr/Ap 17 Apr-19 Apr 006/005-006/005-008/012

VI. Geomagnetic Activity Probabilities 17 Apr-19 Apr A. Middle Latitudes Active 10/10/35 Minor Storm 01/01/20 Major-severe storm 01/01/05 B. High Latitudes Active 20/20/15 Minor Storm 20/20/30 Major-severe storm 10/10/45


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