Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 18 November 2021

Status Report From: Space Weather Prediction Center (NOAA)
Posted: Thursday, November 18, 2021

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 322 Issued at 2200Z on 18 Nov 2021 IA. Analysis of Solar Active Regions and Activity from 17/2100Z to 18/2100Z: Solar activity has been at very low levels for the past 24 hours. There are currently 2 numbered sunspot regions 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, two, and three (19 Nov, 20 Nov, 21 Nov). IIA. Geophysical Activity Summary 17/2100Z to 18/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 598 km/s at 17/2134Z. Total IMF reached 5 nT at 18/0104Z. The maximum southward component of Bz reached -2 nT at 18/0518Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 365 pfu.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on day one (19 Nov) and quiet to active levels on days two and three (20 Nov, 21 Nov). III. Event probabilities 19 Nov-21 Nov Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 18 Nov 082 Predicted 19 Nov-21 Nov 080/080/082 90 Day Mean 18 Nov 087 V. Geomagnetic A Indices Observed Afr/Ap 17 Nov 009/008 Estimated Afr/Ap 18 Nov 006/008 Predicted Afr/Ap 19 Nov-21 Nov 007/008-009/012-013/015 VI. Geomagnetic Activity Probabilities 19 Nov-21 Nov A. Middle Latitudes Active 20/30/30 Minor Storm 05/10/15 Major-severe storm 01/01/05 B. High Latitudes Active 15/15/15 Minor Storm 25/30/30 Major-severe storm 25/40/50

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