Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 13 April 2020

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 104 Issued at 2200Z on 13 Apr 2020

IA. Analysis of Solar Active Regions and Activity from 12/2100Z to 13/2100Z: 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 (14 Apr, 15 Apr, 16 Apr).

IIA. Geophysical Activity Summary 12/2100Z to 13/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 429 km/s at 13/0225Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 158 pfu.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one, two, and three (14 Apr, 15 Apr, 16 Apr).

III. Event probabilities 14 Apr-16 Apr
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF green

IV. Penticton 10.7 cm Flux
Observed 13 Apr 070
Predicted 14 Apr-16 Apr 070/070/068
90 Day Mean 13 Apr 071

V. Geomagnetic A Indices
Observed Afr/Ap 12 Apr 005/006
Estimated Afr/Ap 13 Apr 005/005
Predicted Afr/Ap 14 Apr-16 Apr 006/005-005/005-006/005

VI. Geomagnetic Activity Probabilities 14 Apr-16 Apr
A. Middle Latitudes
Active 10/10/10
Minor Storm 01/01/01
Major-severe storm 01/01/01
B. High Latitudes
Active 15/15/15
Minor Storm 20/20/20
Major-severe storm 10/10/10