- Press Release
- August 16, 2022
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 22 May 2018
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 142 Issued at 2200Z on 22 May 2018
IA. Analysis of Solar Active Regions and Activity from 21/2100Z to 22/2100Z: 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 with a chance for a C-class flares on days one, two, and three (23 May, 24 May, 25 May).
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 362 km/s at 22/2059Z. Total IMF reached 9 nT at 22/1837Z. The maximum southward component of Bz reached -7 nT at 22/1738Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 954 pfu.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and two (23 May, 24 May) and quiet to unsettled levels on day three (25 May).
III. Event probabilities 23 May-25 May
Class M 01/01/01
Class X 01/01/01
IV. Penticton 10.7 cm Flux
Observed 22 May 071
Predicted 23 May-25 May 072/072/073
90 Day Mean 22 May 069
V. Geomagnetic A Indices
Observed Afr/Ap 21 May 003/004
Estimated Afr/Ap 22 May 006/009
Predicted Afr/Ap 23 May-25 May 011/012-011/012-008/008
VI. Geomagnetic Activity Probabilities 23 May-25 May
A. Middle Latitudes
Minor Storm 10/10/05
Major-severe storm 01/01/01
B. High Latitudes
Minor Storm 30/30/25
Major-severe storm 40/40/25