Viewing archive of Wednesday, 6 December 2006

Solar activity report

Report of Solar-Geophysical Activity 2006 Dec 06 2204 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 340 Issued at 2200Z on 06 Dec 2006

IA. Analysis of Solar Active Regions and Activity from 05-2100Z to 06-2100Z

Solar activity was high. Region 930 (S05E60) produced an M6/SF flare at 06/0823Z and an X6/3B flare at 06/1847Z. The M6 flare had an associated Type IV radio sweep and a Tenflare. The X6 flare had an associated Type IV radio sweep, a Tenflare, and a Type II radio sweep (estimated shock speed of 827 km/s). A CME was probably associated with this event, but LASCO imagery is unavailable for confirmation. Region 930 is now classified as a Dkc group with an area of 490 millionths. It is magnetically complex, with an east-west inversion line and a Beta-Gamma-Delta configuration.
IB. Solar Activity Forecast
Solar activity is expected to be high. Region 930 is expected to produce M-class flares and there is a good chance for further X-class activity.
IIA. Geophysical Activity Summary 05-2100Z to 06-2100Z
The geomagnetic field ranged from unsettled to minor storm levels. Solar wind speed has increased to approximately 600 km/s, indicating the onset of a coronal hole high speed stream. The greater than 10 MeV proton flux reached the event threshold of 10 pfu at 06/1555Z, with a maximum observed flux so far of 24 at 2100Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be unsettled to active on 07 - 08 December with a chance for periods of minor or major storm conditions due to the recurrent coronal hole high speed stream. Quiet to unsettled conditions are expected on 09 December. The greater than 10 MeV proton event is expected to continue for at least another 24 hours.
III. Event Probabilities 07 Dec to 09 Dec
Class M85%85%85%
Class X50%50%50%
IV. Penticton 10.7 cm Flux
  Observed       06 Dec 103
  Predicted   07 Dec-09 Dec  105/105/105
  90 Day Mean        06 Dec 080
V. Geomagnetic A Indices
  Observed Afr/Ap 05 Dec  002/002
  Estimated     Afr/Ap 06 Dec  018/025
  Predicted    Afr/Ap 07 Dec-09 Dec  020/025-015/015-010/010
VI. Geomagnetic Activity Probabilities 07 Dec to 09 Dec
A. Middle Latitudes
Minor storm20%15%10%
Major-severe storm05%05%01%
B. High Latitudes
Minor storm20%15%10%
Major-severe storm05%05%01%

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