Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 7 December 2021

Status Report From: Space Weather Prediction Center (NOAA)
Posted: Tuesday, December 7, 2021

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 341 Issued at 2200Z on 07 Dec 2021 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 531 km/s at 07/1054Z. Total IMF reached 5 nT at 07/0515Z. The maximum southward component of Bz reached -4 nT at 06/2310Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 950 pfu.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one and two (08 Dec, 09 Dec) and quiet to unsettled levels on day three (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 079 Predicted 08 Dec-10 Dec 080/080/080 90 Day Mean 07 Dec 087 V. Geomagnetic A Indices Observed Afr/Ap 06 Dec 006/005 Estimated Afr/Ap 07 Dec 006/008 Predicted Afr/Ap 08 Dec-10 Dec 006/005-006/005-007/010 VI. Geomagnetic Activity Probabilities 08 Dec-10 Dec A. Middle Latitudes Active 10/10/25 Minor Storm 01/01/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 20/20/30 Major-severe storm 20/15/30

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