Viewing archive of Sunday, 11 October 2009

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 2009 Oct 11 2201 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 284 Issued at 2200Z on 11 Oct 2009

IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z

Solar activity was very low. No flares were observed.
IB. Solar Activity Forecast
Solar activity is expected to be very low.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
Geomagnetic field activity was at quiet to unsettled levels. A geomagnetic sudden impulse occurred at 11/0042Z (09 nT, as measured by the Boulder USGS magnetometer). ACE solar wind observations indicated a recurrent coronal hole high-speed stream commenced early in the period. Solar wind velocities gradually increased during the period (peak 463 km/sec at 11/1901Z). A period of mostly southward Bz was observed during 11/0430 - 0800Z (minimum -10 nT at 11/0636Z).
IIB. Geophysical Activity Forecast
Geomagnetic field activity is expected to be at mostly quiet levels through the period (12 - 14 October) with a chance for isolated unsettled conditions as the recurrent coronal hole high-speed stream persists.
III. Event Probabilities 12 Oct to 14 Oct
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       11 Oct 070
  Predicted   12 Oct-14 Oct  070/070/070
  90 Day Mean        11 Oct 069
V. Geomagnetic A Indices
  Observed Afr/Ap 10 Oct  000/002
  Estimated     Afr/Ap 11 Oct  007/007
  Predicted    Afr/Ap 12 Oct-14 Oct  007/007-005/005-005/005
VI. Geomagnetic Activity Probabilities 12 Oct to 14 Oct
A. Middle Latitudes
Active10%05%05%
Minor storm01%01%01%
Major-severe storm01%01%01%
B. High Latitudes
Active15%10%10%
Minor storm01%01%01%
Major-severe storm01%01%01%

All times in UTC

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Current data suggests there is a moderate possibility for aurora to appear at the following high latitude regions in the near future

Gillam, MB, Whitehorse, YT
Fairbanks, AK

Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future

Edmonton, AB, Saskatoon, SK, Yellowknife, NT
Anchorage, AK, Juneau, AK

Current data suggests there is a slight possibility for aurora to appear at the following middle latitude regions in the near future

Calgary, AB
The solar wind speed is currently moderately high (674.3 km/sec.)
The Disturbance Storm Time index predicts moderate storm conditions right now (-60nT)

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