Viewing archive of Saturday, 27 October 2012

Solar activity report

Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 2012 Oct 27 2200 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 301 Issued at 2200Z on 27 Oct 2012

IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z

Solar activity was low. Three low-level C-class flares were observed from behind the west limb, likely from old Region 1594 (S27, L=200). Region 1598 (S11W10), a Dkc/Beta-Delta spot group, remained the most magnetically complex region on the visible disk and produced a B9/Sf flare at 27/1235Z. Region 1596 (N08W48), a Dao/Beta-Gamma spot group, has shown signs of penumbral decay, mainly in its trailer spots. The remaining two spot groups were stable and unremarkable. A CME was observed in STEREO Ahead COR 2 imagery at 27/1824Z. Further analysis will be performed to determine its geo-effectiveness as data becomes available.
IB. Solar Activity Forecast
Solar activity is expected to be low with a slight chance for isolated M-class flares for the next three days (28-30 October).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic field has been quiet for the past 24 hours. Solar wind speed, as measured by the ACE spacecraft, remained steady at approximately 350 km/s. The Bz component of the interplanetary magnetic field had minor deflections of +/- 5 nT while the total field remained steady at 5 nT. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels during the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to remain quiet for the next three days (28-30 October).
III. Event Probabilities 28 Oct to 30 Oct
Class M15%10%10%
Class X01%01%01%
IV. Penticton 10.7 cm Flux
  Observed       27 Oct 122
  Predicted   28 Oct-30 Oct  120/115/110
  90 Day Mean        27 Oct 122
V. Geomagnetic A Indices
  Observed Afr/Ap 26 Oct  004/004
  Estimated     Afr/Ap 27 Oct  004/004
  Predicted    Afr/Ap 28 Oct-30 Oct  006/005-006/005-006/005
VI. Geomagnetic Activity Probabilities 28 Oct to 30 Oct
A. Middle Latitudes
Minor storm01%01%01%
Major-severe storm01%01%01%
B. High Latitudes
Minor storm10%10%10%
Major-severe storm05%05%05%

All times in UTC

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