Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 30 April 2020

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 121 Issued at 2200Z on 30 Apr 2020

IA. Analysis of Solar Active Regions and Activity from 29/2100Z to 30/2100Z: Solar activity has been at very low levels for the past 24 hours. There are currently 3 numbered sunspot regions on the disk.

IB. Solar Activity Forecast: Solar activity is expected to be very low with a slight chance for a C-class flare on days one, two, and three (01 May, 02 May, 03 May).

IIA. Geophysical Activity Summary 29/2100Z to 30/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 333 km/s at 29/2210Z. Total IMF reached 5 nT at 30/2051Z. The maximum southward component of Bz reached -2 nT at29/2214Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 179 pfu.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on days one and two (01 May, 02 May) and quiet to unsettled levels on day three (03 May).

III. Event probabilities 01 May-03 May
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF green

IV. Penticton 10.7 cm Flux
Observed 30 Apr 070
Predicted 01 May-03 May 070/070/070
90 Day Mean 30 Apr 070

V. Geomagnetic A Indices
Observed Afr/Ap 29 Apr 004/002
Estimated Afr/Ap 30 Apr 002/003
Predicted Afr/Ap 01 May-03 May 006/005-006/005-007/008

VI. Geomagnetic Activity Probabilities 01 May-03 May
A. Middle Latitudes
Active 10/10/15
Minor Storm 01/01/05
Major-severe storm 01/01/01
B. High Latitudes
Active 15/15/15
Minor Storm 20/20/25
Major-severe storm 10/10/25