Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 29 April 2019

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 119 Issued at 2200Z on 29 Apr 2019

IA. Analysis of Solar Active Regions and Activity from 28/2100Z to 29/2100Z: 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 (30 Apr, 01 May, 02 May).

IIA. Geophysical Activity Summary 28/2100Z to 29/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 404 km/s at 29/0025Z. Total IMF reached 5 nT at 29/1419Z. The maximum southward component of Bz reached -4 nT at 29/1418Z.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on day one (30 Apr) and quiet to active levels on days two and three (01 May, 02 May).

III. Event probabilities 30 Apr-02 May
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF green

IV. Penticton 10.7 cm Flux
Observed 29 Apr 067
Predicted 30 Apr-02 May 068/068/068
90 Day Mean 29 Apr 072

V. Geomagnetic A Indices
Observed Afr/Ap 28 Apr 004/005
Estimated Afr/Ap 29 Apr 004/005
Predicted Afr/Ap 30 Apr-02 May 006/005-007/010-014/015

VI. Geomagnetic Activity Probabilities 30 Apr-02 May
A. Middle Latitudes
Active 10/20/30
Minor Storm 01/05/10
Major-severe storm 01/01/01
B. High Latitudes
Active 15/20/15
Minor Storm 15/25/30
Major-severe storm 15/25/40