Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 27 February 2017
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 58 Issued at 2200Z on 27 Feb 2017
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 3 numbered sunspot regions on the disk.
IB. Solar Activity Forecast: Solar activity is expected to be very low with a chance for a C-class flares on days one, two, and three (28 Feb, 01 Mar, 02 Mar).
IIA. Geophysical Activity Summary 26/2100Z to 27/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 399 km/s at 26/2106Z. Total IMF reached 6 nT at 27/1104Z. The maximum southward component of Bz reached -5 nT at 27/1822Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 730 pfu.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (28 Feb), unsettled to minor storm levels on day two (01 Mar) and quiet to minor storm levels on day three (02 Mar).
III. Event probabilities 28 Feb-02 Mar
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF green
IV. Penticton 10.7 cm Flux
Observed 27 Feb 082
Predicted 28 Feb-02 Mar 081/080/081
90 Day Mean 27 Feb 077
V. Geomagnetic A Indices
Observed Afr/Ap 26 Feb 000/002
Estimated Afr/Ap 27 Feb 006/007
Predicted Afr/Ap 28 Feb-02 Mar 010/012-017/025-015/020
VI. Geomagnetic Activity Probabilities 28 Feb-02 Mar
A. Middle Latitudes
Active 30/40/35
Minor Storm 10/25/25
Major-severe storm 01/05/05
B. High Latitudes
Active 15/10/10
Minor Storm 30/25/20
Major-severe storm 40/60/60