Report of Solar Geophysical Activity (RSGA)

By Newsroom America Feeds at 16 Feb 2018

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 47 Issued at 2200Z on 16 Feb 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 is currently 1 numbered sunspot region on the disk. IB. Solar Activity Forecast: Solar activity is expected to be very low with a slight chance for a C-class flare on days one and two (17 Feb, 18 Feb) and expected to be very low on day three (19 Feb).

IIA. Geophysical Activity Summary 15/2100Z to 16/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 426 km/s at 16/2010Z. Total IMF reached 14 nT at 16/0527Z. The maximum southward component of Bz reached -9 nT at 16/0855Z. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (17 Feb) and quiet to unsettled levels on days two and three (18 Feb, 19 Feb).

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

IV. Penticton 10.7 cm Flux Observed 16 Feb 072 Predicted 17 Feb-19 Feb 070/068/068 90 Day Mean 16 Feb 072

V. Geomagnetic A Indices Observed Afr/Ap 15 Feb 006/009 Estimated Afr/Ap 16 Feb 008/012 Predicted Afr/Ap 17 Feb-19 Feb 011/014-011/012-007/008

VI. Geomagnetic Activity Probabilities 17 Feb-19 Feb A. Middle Latitudes Active 30/25/15 Minor Storm 10/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/20/20 Minor Storm 30/30/25 Major-severe storm 30/30/20


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