- Status Report
- August 11, 2022
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 26 April 2018
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 116 Issued at 2200Z on 26 Apr 2018
IA. Analysis of Solar Active Regions and Activity from 25/2100Z to 26/2100Z: 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 (27 Apr, 28 Apr, 29 Apr).
IIA. Geophysical Activity Summary 25/2100Z to 26/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 396 km/s at 26/1503Z. Total IMF reached 6 nT at 26/0940Z. The maximum southward component of Bz reached -4 nT at 25/2108Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 4623 pfu.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (27 Apr) and quiet levels on days two and three (28 Apr, 29 Apr).
III. Event probabilities 27 Apr-29 Apr
Class M 01/01/01
Class X 01/01/01
IV. Penticton 10.7 cm Flux
Observed 26 Apr 069
Predicted 27 Apr-29 Apr 069/069/068
90 Day Mean 26 Apr 070
V. Geomagnetic A Indices
Observed Afr/Ap 25 Apr 004/006
Estimated Afr/Ap 26 Apr 006/006
Predicted Afr/Ap 27 Apr-29 Apr 010/012-006/005-006/005
VI. Geomagnetic Activity Probabilities 27 Apr-29 Apr
A. Middle Latitudes
Minor Storm 10/01/01
Major-severe storm 01/01/01
B. High Latitudes
Minor Storm 30/15/15
Major-severe storm 35/15/15