Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 4 February 2020

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 35 Issued at 2200Z on 04 Feb 2020

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 Feb, 06 Feb, 07 Feb).

IIA. Geophysical Activity Summary 03/2100Z to 04/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 388 km/s at 04/1912Z. Total IMF reached 7 nT at 04/1820Z. The maximum southward component of Bz reached -4 nT at 04/0219Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 654 pfu.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on day one (05 Feb), quiet to active levels on day two (06 Feb) and quiet to unsettled levels on day three (07 Feb).

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

IV. Penticton 10.7 cm Flux
Observed 04 Feb 070
Predicted 05 Feb-07 Feb 070/070/070
90 Day Mean 04 Feb 071

V. Geomagnetic A Indices
Observed Afr/Ap 03 Feb 003/003
Estimated Afr/Ap 04 Feb 005/005
Predicted Afr/Ap 05 Feb-07 Feb 005/005-009/012-009/008

VI. Geomagnetic Activity Probabilities 05 Feb-07 Feb
A. Middle Latitudes
Active 10/30/25
Minor Storm 01/10/05
Major-severe storm 01/01/01
B. High Latitudes
Active 15/15/15
Minor Storm 20/30/30
Major-severe storm 10/40/30