- Press Release
- September 25, 2022
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 27 July 2020
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 209 Issued at 2200Z on 27 Jul 2020
IA. Analysis of Solar Active Regions and Activity from 26/2100Z to 27/2100Z: Solar activity has been at very low levels for the past 24 hours. There are currently 1 numbered sunspot regions on the disk.
IB. Solar Activity Forecast: Solar activity is expected to be very low on days one, two, and three (28 Jul, 29 Jul, 30 Jul).
IIA. Geophysical Activity Summary 26/2100Z to 27/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 431 km/s at 27/1211Z. Total IMF reached 6 nT at 27/1810Z. The maximum southward component of Bz reached -3 nT at 27/0448Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 423 pfu.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on days one and two (28 Jul, 29 Jul) and quiet levels on day three (30 Jul).
III. Event probabilities 28 Jul-30 Jul
Class M 01/01/01
Class X 01/01/01
IV. Penticton 10.7 cm Flux
Observed 27 Jul 071
Predicted 28 Jul-30 Jul 070/070/070
90 Day Mean 27 Jul 069
V. Geomagnetic A Indices
Observed Afr/Ap 26 Jul 003/002
Estimated Afr/Ap 27 Jul 005/005
Predicted Afr/Ap 28 Jul-30 Jul 007/008-007/008-005/005
VI. Geomagnetic Activity Probabilities 28 Jul-30 Jul
A. Middle Latitudes
Minor Storm 01/01/01
Major-severe storm 01/01/01
B. High Latitudes
Minor Storm 25/25/20
Major-severe storm 20/20/10