Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 27 July 2019

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 208 Issued at 2200Z on 27 Jul 2019

IA. Analysis of Solar Active Regions and Activity from 26/2100Z to 27/2100Z: 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 (28 Jul, 29 Jul, 30 Jul).

IIA. Geophysical Activity Summary 26/2100Z to 27/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 332 km/s at 27/0841Z. Total IMF reached 6 nT at 27/0815Z. The maximum southward component of Bz reached -5 nT at 27/1723Z.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on day one (28 Jul) and quiet levels on days two and three (29 Jul, 30 Jul).

III. Event probabilities 28 Jul-30 Jul
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF green

IV. Penticton 10.7 cm Flux
Observed 27 Jul 067
Predicted 28 Jul-30 Jul 067/067/067
90 Day Mean 27 Jul 069

V. Geomagnetic A Indices
Observed Afr/Ap 26 Jul 004/002
Estimated Afr/Ap 27 Jul 004/004
Predicted Afr/Ap 28 Jul-30 Jul 007/008-006/005-005/005

VI. Geomagnetic Activity Probabilities 28 Jul-30 Jul
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 25/20/20
Major-severe storm 20/15/15