Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 107 Issued at 2200Z on 16 Apr 2020

IA. Analysis of Solar Active Regions and Activity from 15/2100Z to 16/2100Z: 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 (17 Apr, 18 Apr, 19 Apr).

IIA. Geophysical Activity Summary 15/2100Z to 16/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 459 km/s at 16/0132Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 193 pfu.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one, two, and three (17 Apr, 18 Apr, 19 Apr).

III. Event probabilities 17 Apr-19 Apr
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF green

IV. Penticton 10.7 cm Flux
Observed 16 Apr 069
Predicted 17 Apr-19 Apr 069/069/069
90 Day Mean 16 Apr 071

V. Geomagnetic A Indices
Observed Afr/Ap 15 Apr 006/006
Estimated Afr/Ap 16 Apr 005/005
Predicted Afr/Ap 17 Apr-19 Apr 005/005-006/005-006/005

VI. Geomagnetic Activity Probabilities 17 Apr-19 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