Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 22 March 2019
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 81 Issued at 2200Z on 22 Mar 2019
IA. Analysis of Solar Active Regions and Activity from 21/2100Z to 22/2100Z: Solar activity has been at low levels for the past 24 hours. The largest solar event of the period was a C4 event observed at 22/0514Z from Region 2736 (N08W62). There are currently 1 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, two, and three (23 Mar, 24 Mar, 25 Mar).
IIA. Geophysical Activity Summary 21/2100Z to 22/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 342 km/s at 22/0129Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 820 pfu.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to major storm levels on day one (23 Mar), unsettled to minor storm levels on day two (24 Mar) and quiet levels on day three (25 Mar).
III. Event probabilities 23 Mar-25 Mar
Class M 10/10/10
Class X 01/01/01
IV. Penticton 10.7 cm Flux
Observed 22 Mar 082
Predicted 23 Mar-25 Mar 082/082/077
90 Day Mean 22 Mar 071
V. Geomagnetic A Indices
Observed Afr/Ap 21 Mar 002/002
Estimated Afr/Ap 22 Mar 004/005
Predicted Afr/Ap 23 Mar-25 Mar 015/024-020/025-006/005
VI. Geomagnetic Activity Probabilities 23 Mar-25 Mar
A. Middle Latitudes
Minor Storm 40/30/01
Major-severe storm 20/05/01
B. High Latitudes
Minor Storm 20/20/20
Major-severe storm 75/70/20