Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 7 December 2017

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 341 Issued at 2200Z on 07 Dec 2017

IA.  Analysis of Solar Active Regions and Activity from 06/2100Z to 07/2100Z: 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 (08 Dec, 09 Dec, 10 Dec).

IIA.  Geophysical Activity Summary 06/2100Z to 07/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 560 km/s at 07/1156Z. Total IMF reached 6 nT at 07/1153Z. The maximum southward component of Bz reached -4 nT at 06/2230Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 3752 pfu.

IIB.  Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on day one (08 Dec) and quiet levels on days two and three (09 Dec, 10 Dec).

III.  Event probabilities 08 Dec-10 Dec
Class M    01/01/01
Class X    01/01/01
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           07 Dec 068
Predicted   08 Dec-10 Dec 068/068/068
90 Day Mean        07 Dec 076

V.  Geomagnetic A Indices
Observed Afr/Ap 06 Dec  013/013
Estimated Afr/Ap 07 Dec  009/009
Predicted Afr/Ap 08 Dec-10 Dec  007/008-006/005-005/005

VI.  Geomagnetic Activity Probabilities 08 Dec-10 Dec
A.  Middle Latitudes
Active                15/10/10
Minor Storm           05/01/01
Major-severe storm    01/01/01
B.  High Latitudes
Active                20/15/15
Minor Storm           20/15/15
Major-severe storm    20/10/10