Viewing archive of Thursday, 28 August 2014

Solar activity report

Report of Solar-Geophysical Activity 2014 Aug 28 2200 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 240 Issued at 2200Z on 28 Aug 2014

IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z

Solar activity has been at low levels for the past 24 hours. The largest solar event of the period was a C1 event observed at 28/1520Z from Region 2146 (N08W86). There are currently 6 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with a slight chance for an M-class flare on days one and two (29 Aug, 30 Aug) and likely to be low with a slight chance for an M-class flare on day three (31 Aug).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic field has been at unsettled to minor storm levels for the past 24 hours. Solar wind speed, as measured by the ACE spacecraft, reached a peak speed of 386 km/s at 28/1026Z. Total IMF reached 13 nT at 27/2100Z. The maximum southward component of Bz reached -11 nT at 28/0244Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 280 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on day one (29 Aug) and quiet to unsettled levels on days two and three (30 Aug, 31 Aug). Protons greater than 10 Mev have a slight chance of crossing threshold on days one and two (29 Aug, 30 Aug).
III. Event Probabilities 29 Aug to 31 Aug
Class M 20%20%10%
Class X 01%01%01%
IV. Penticton 10.7 cm Flux
  Observed       28 Aug 119
  Predicted    29 Aug-31 Aug 115/115/115
  90 Day Mean        28 Aug 128

V. Geomagnetic A Indices
  Observed Afr/Ap 27 Aug  019/021
  Estimated     Afr/Ap 28 Aug  016/022
  Predicted     Afr/Ap 29 Aug-31 Aug  010/010-008/008-011/012

VI. Geomagnetic Activity Probabilities 29 Aug to 31 Aug
A. Middle Latitudes
Minor storm 10%01%05%
Major-severe storm 01%01%01%
B. High Latitudes
Minor storm 20%15%15%
Major-severe storm 20%10%10%

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