Report of Solar Geophysical Activity (RSGA)

By Newsroom America Feeds at 13 Feb 17:02

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 44 Issued at 2200Z on 13 Feb 2018

IA. Analysis of Solar Active Regions and Activity from 12/2100Z to 13/2100Z: 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 with a chance for a C-class flares and a slight chance for an M-class flare on days one and two (14 Feb, 15 Feb) and expected to be very low with a chance for a C-class flares on day three (16 Feb).

IIA. Geophysical Activity Summary 12/2100Z to 13/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 337 km/s at 13/1820Z. Total IMF reached 5 nT at 13/2009Z. The maximum southward component of Bz reached -4 nT at 13/2018Z. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (14 Feb), unsettled to minor storm levels on day two (15 Feb) and quiet to minor storm levels on day three (16 Feb).

III. Event probabilities 14 Feb-16 Feb Class M 10/10/05 Class X 01/01/01 Proton 05/05/01 PCAF green

IV. Penticton 10.7 cm Flux Observed 13 Feb 076 Predicted 14 Feb-16 Feb 076/075/074 90 Day Mean 13 Feb 072

V. Geomagnetic A Indices Observed Afr/Ap 12 Feb 003/003 Estimated Afr/Ap 13 Feb 003/004 Predicted Afr/Ap 14 Feb-16 Feb 009/012-020/028-014/020

VI. Geomagnetic Activity Probabilities 14 Feb-16 Feb A. Middle Latitudes Active 30/35/35 Minor Storm 15/30/25 Major-severe storm 01/10/05 B. High Latitudes Active 10/10/10 Minor Storm 25/25/30 Major-severe storm 45/60/55


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