Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 31 May 2019
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 151 Issued at 2200Z on 31 May 2019
IA. Analysis of Solar Active Regions and Activity from 30/2100Z to 31/2100Z: 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 (01 Jun, 02 Jun, 03 Jun).
IIA. Geophysical Activity Summary 30/2100Z to 31/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 524 km/s at 30/2259Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 4446 pfu.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one and two (01 Jun, 02 Jun) and quiet to unsettled levels on day three (03 Jun).
III. Event probabilities 01 Jun-03 Jun
Class M 01/01/01
Class X 01/01/01
IV. Penticton 10.7 cm Flux
Observed 31 May 069
Predicted 01 Jun-03 Jun 071/072/072
90 Day Mean 31 May 072
V. Geomagnetic A Indices
Observed Afr/Ap 30 May 008/008
Estimated Afr/Ap 31 May 006/006
Predicted Afr/Ap 01 Jun-03 Jun 006/006-006/005-007/008
VI. Geomagnetic Activity Probabilities 01 Jun-03 Jun
A. Middle Latitudes
Minor Storm 01/01/05
Major-severe storm 01/01/01
B. High Latitudes
Minor Storm 15/20/25
Major-severe storm 15/10/20