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Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 18 April 2022

Status Report From: Space Weather Prediction Center (NOAA)
Posted: Monday, April 18, 2022

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 108 Issued at 2200Z on 18 Apr 2022 IA. Analysis of Solar Active Regions and Activity from 17/2100Z to 18/2100Z: Solar activity has been at moderate levels for the past 24 hours. The largest solar event of the period was a M4 event observed at 17/2234Z from Region 2992 (S31W76). There are currently 5 numbered sunspot regions on the disk.

IB. Solar Activity Forecast: Solar activity is expected to be moderate with a chance for X-class flares on days one, two, and three (19 Apr, 20 Apr, 21 Apr). 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 600 km/s at 18/0234Z. Total IMF reached 10 nT at 17/2147Z. The maximum southward component of Bz reached -6 nT at 18/0926Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1646 pfu.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on days one, two, and three (19 Apr, 20 Apr, 21 Apr). III. Event probabilities 19 Apr-21 Apr Class M 75/75/75 Class X 25/25/25 Proton 05/05/05 PCAF green IV. Penticton 10.7 cm Flux Observed 18 Apr 135 Predicted 19 Apr-21 Apr 130/130/130 90 Day Mean 18 Apr 113 V. Geomagnetic A Indices Observed Afr/Ap 17 Apr 009/011 Estimated Afr/Ap 18 Apr 009/011 Predicted Afr/Ap 19 Apr-21 Apr 009/010-009/010-008/008 VI. Geomagnetic Activity Probabilities 19 Apr-21 Apr A. Middle Latitudes Active 25/25/20 Minor Storm 05/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 30/30/25 Major-severe storm 30/30/30


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