Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 20 July 2018

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 201 Issued at 2200Z on 20 Jul 2018

IA. Analysis of Solar Active Regions and Activity from 19/2100Z to 20/2100Z: 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 (21 Jul, 22 Jul, 23 Jul).

IIA. Geophysical Activity Summary 19/2100Z to 20/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 482 km/s at 20/0910Z. Total IMF reached 7 nT at 20/1957Z. The maximum southward component of Bz reached -5 nT at 20/0849Z.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on days one and two (21 Jul, 22 Jul) and quiet to active levels on day three (23 Jul).

III. Event probabilities 21 Jul-23 Jul
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF green

IV. Penticton 10.7 cm Flux
Observed 20 Jul 071
Predicted 21 Jul-23 Jul 071/071/071
90 Day Mean 20 Jul 071

V. Geomagnetic A Indices
Observed Afr/Ap 19 Jul 004/004
Estimated Afr/Ap 20 Jul 007/007
Predicted Afr/Ap 21 Jul-23 Jul 006/008-008/008-008/010

VI. Geomagnetic Activity Probabilities 21 Jul-23 Jul
A. Middle Latitudes
Active 15/15/25
Minor Storm 05/05/10
Major-severe storm 01/01/01
B. High Latitudes
Active 15/15/15
Minor Storm 25/25/25
Major-severe storm 20/20/35