- Press Release
- Sep 27, 2022
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 13 August 2021
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 225 Issued at 2200Z on 13 Aug 2021
IA. Analysis of Solar Active Regions and Activity from 12/2100Z to 13/2100Z: Solar activity has been at very low levels for the past 24 hours. There are currently 0 numbered sunspot regions on the disk.
IB. Solar Activity Forecast: Solar activity is expected to be very low on days one, two, and three (14 Aug, 15 Aug, 16 Aug).
IIA. Geophysical Activity Summary 12/2100Z to 13/2100Z: The geomagnetic. field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 467 km/s at 13/1421Z. Total IMF reached 8 nT at 13/0835Z. The maximum southward component of Bz reached -4 nT at 13/0653Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 165 pfu.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on days one and two (14 Aug, 15 Aug) and quiet levels on day three (16 Aug).
III. Event probabilities 14 Aug-16 Aug
Class M 01/01/01
Class X 01/01/01
IV. Penticton 10.7 cm Flux
Observed 13 Aug 073
Predicted 14 Aug-16 Aug 073/072/072
90 Day Mean 13 Aug 079
V. Geomagnetic A Indices
Observed Afr/Ap 12 Aug 006/004
Estimated Afr/Ap 13 Aug 007/008
Predicted Afr/Ap 14 Aug-16 Aug 008/008-008/008-006/005
VI. Geomagnetic Activity Probabilities 14 Aug-16 Aug
A. Middle Latitudes
Minor Storm 05/05/01
Major-severe storm 01/01/01
B. High Latitudes
Minor Storm 25/25/20
Major-severe storm 25/25/15