- Press Release
- August 15, 2022
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 8 April 2018
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 98 Issued at 2200Z on 08 Apr 2018
IA. Analysis of Solar Active Regions and Activity from 07/2100Z to 08/2100Z: 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 (09 Apr, 10 Apr, 11 Apr).
IIA. Geophysical Activity Summary 07/2100Z to 08/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 392 km/s at 07/2245Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 488 pfu.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on day one (09 Apr) and quiet to minor storm levels on days two and three (10 Apr, 11 Apr).
III. Event probabilities 09 Apr-11 Apr
Class M 01/01/01
Class X 01/01/01
IV. Penticton 10.7 cm Flux
Observed 08 Apr 068
Predicted 09 Apr-11 Apr 067/067/067
90 Day Mean 08 Apr 070
V. Geomagnetic A Indices
Observed Afr/Ap 07 Apr 004/004
Estimated Afr/Ap 08 Apr 004/005
Predicted Afr/Ap 09 Apr-11 Apr 008/008-015/018-014/018
VI. Geomagnetic Activity Probabilities 09 Apr-11 Apr
A. Middle Latitudes
Minor Storm 05/25/25
Major-severe storm 01/05/05
B. High Latitudes
Minor Storm 25/30/30
Major-severe storm 25/55/55