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Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 20 April 2021

Status Report From: Space Weather Prediction Center (NOAA)
Posted: Tuesday, April 20, 2021

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 110 Issued at 2200Z on 20 Apr 2021 IA. Analysis of Solar Active Regions and Activity from 19/2100Z to 20/2100Z: Solar activity has been at moderate levels for the past 24 hours. The largest solar event of the period was a M1 event observed at 19/2342Z from Region 2816 (S24E21). There are currently 3 numbered sunspot regions on the disk.

IB. Solar Activity Forecast: Solar activity is likely to be low with a slight chance for an M-class flare on days one and two (21 Apr, 22 Apr) and expected to be very low with a chance for a C-class flares and a slight chance for an M-class flare on day three (23 Apr). IIA. Geophysical Activity Summary 19/2100Z to 20/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 687 km/s at 19/2348Z. Total IMF reached 6 nT at 20/0222Z. The maximum southward component of Bz reached -5 nT at 19/2342Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 13356 pfu.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on days one and three (21 Apr, 23 Apr) and quiet levels on day two (22 Apr). III. Event probabilities 21 Apr-23 Apr Class M 15/15/10 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 20 Apr 080 Predicted 21 Apr-23 Apr 084/082/082 90 Day Mean 20 Apr 076 V. Geomagnetic A Indices Observed Afr/Ap 19 Apr 015/020 Estimated Afr/Ap 20 Apr 011/012 Predicted Afr/Ap 21 Apr-23 Apr 006/005-005/005-007/008 VI. Geomagnetic Activity Probabilities 21 Apr-23 Apr A. Middle Latitudes Active 15/15/25 Minor Storm 01/01/10 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 25/20/30 Major-severe storm 20/20/40


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