Report of Solar Geophysical Activity (RSGA)

By Newsroom America Feeds at 11 Aug 18:01

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 223 Issued at 2200Z on 11 Aug 2017

IA. Analysis of Solar Active Regions and Activity from 10/2100Z to 11/2100Z: 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 (12 Aug, 13 Aug, 14 Aug).

IIA. Geophysical Activity Summary 10/2100Z to 11/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 486 km/s at 11/2042Z. Total IMF reached 10 nT at 11/1816Z. The maximum southward component of Bz reached -7 nT at 11/1421Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 4352 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and two (12 Aug, 13 Aug) and quiet to unsettled levels on day three (14 Aug).

III. Event probabilities 12 Aug-14 Aug Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green

IV. Penticton 10.7 cm Flux Observed 11 Aug 070 Predicted 12 Aug-14 Aug 070/068/068 90 Day Mean 11 Aug 076

V. Geomagnetic A Indices Observed Afr/Ap 10 Aug 007/004 Estimated Afr/Ap 11 Aug 006/006 Predicted Afr/Ap 12 Aug-14 Aug 012/015-010/012-009/008

VI. Geomagnetic Activity Probabilities 12 Aug-14 Aug A. Middle Latitudes Active 30/25/15 Minor Storm 10/10/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 25/30/25 Major-severe storm 40/40/25

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