- Press Release
- Nov 29, 2022
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 27 August 2017
Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 239 Issued at 2200Z on 27 Aug 2017
IA. Analysis of Solar Active Regions and Activity from 26/2100Z to 27/2100Z: Solar activity has been at low levels for the past 24 hours. The largest solar event of the period was a C6 event observed at 27/1516Z from Region 2671 (N13W93). There are currently 1 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 and a slight chance for an M-class flare on days one, two, and three (28 Aug, 29 Aug, 30 Aug).
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 27/0705Z. Total IMF reached 9 nT at 27/1621Z. The maximum southward component of Bz reached -9 nT at 27/1645Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 8019 pfu.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and three (28 Aug, 30 Aug) and quiet to unsettled levels on day two (29 Aug).
III. Event probabilities 28 Aug-30 Aug
Class M 10/10/10
Class X 01/01/01
IV. Penticton 10.7 cm Flux
Observed 27 Aug 078
Predicted 28 Aug-30 Aug 078/078/078
90 Day Mean 27 Aug 076
V. Geomagnetic A Indices
Observed Afr/Ap 26 Aug 005/004
Estimated Afr/Ap 27 Aug 009/011
Predicted Afr/Ap 28 Aug-30 Aug 009/008-007/008-012/015
VI. Geomagnetic Activity Probabilities 28 Aug-30 Aug
A. Middle Latitudes
Minor Storm 01/05/10
Major-severe storm 01/01/01
B. High Latitudes
Minor Storm 15/15/20
Major-severe storm 15/15/20