Viewing archive of Tuesday, 12 July 2005

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 2005 Jul 12 2320 UTC
# Prepared jointly by the U.S. Dept. of Commerce, NOAA, #Space Environment Center and the U.S. Air Force. #

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 193 Issued at 2200Z on 12 Jul 2005

IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z

Solar activity was moderate. Region 786 (N11W70) produced numerous C-class flares and two M1 flares this period. A C8 flare was observed at 12/0802Z with an associated faint CME. The first of two M1 flares was observed at 12/1306Z. Weak radio emissions and another faint CME was associated with this event. A more complex and long duration M1 flare occurred at 12/1624Z. Radio emissions included a 750 sfu Tenflare and Type IV radio sweep. A bright CME was observed on LASCO imagery. Although most of the ejecta was westward directed, faint extensions of this CME were visible over the north pole and over the east limb. Region 786 maintains a complex beta-gamma-delta configuration as it approaches the west limb. The remaining regions on the visible disk were stable.
IB. Solar Activity Forecast
Solar activity is expected to be low to moderate. Isolated M-class activity is possible from Region 786.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
The geomagnetic field ranged from quiet to major storm levels. A discontinuity in the solar wind plasma parameters at around 12/0400Z was likely the arrival of transient flow from the 9 July CME. Solar wind speed increased from 400 km/s to near 550 km/s. The IMF Bz was southward for extended periods of time before rotating northward at around 1600Z. Minor to major storming was observed at high latitudes between 12/0000 - 1800Z. The greater than 2 MeV electron flux at geosynchronous orbit was at high levels.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to range from quiet to minor storm levels. Isolated active periods are possible on 13 and 14 July. Minor storm conditions are possible on 15 July associated with today's CME activity.
III. Event Probabilities 13 Jul to 15 Jul
Class M40%40%10%
Class X10%10%01%
Proton05%05%05%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       12 Jul 096
  Predicted   13 Jul-15 Jul  090/085/080
  90 Day Mean        12 Jul 097
V. Geomagnetic A Indices
  Observed Afr/Ap 11 Jul  014/023
  Estimated     Afr/Ap 12 Jul  030/050
  Predicted    Afr/Ap 13 Jul-15 Jul  015/018-008/012-015/020
VI. Geomagnetic Activity Probabilities 13 Jul to 15 Jul
A. Middle Latitudes
Active30%20%30%
Minor storm15%10%15%
Major-severe storm05%05%05%
B. High Latitudes
Active40%25%40%
Minor storm20%10%20%
Major-severe storm10%05%10%

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