Viewing archive of Thursday, 17 July 2008

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 2008 Jul 17 2203 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 199 Issued at 2200Z on 17 Jul 2008

IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z

Solar activity was very low. The visible disk remained spotless.
IB. Solar Activity Forecast
Solar activity is expected to remain at very low levels.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic field was at quiet to unsettled levels. Solar wind speed, as measured at the ACE spacecraft, indicated a gradual decrease in velocities from about 530 km/s at the beginning of the period, to near 460 km/s by forecast issue time. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels again today.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be mostly quiet for the next three days (18 - 20 July).
III. Event Probabilities 18 Jul to 20 Jul
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFGreen
IV. Penticton 10.7 cm Flux
  Observed       17 Jul 065
  Predicted   18 Jul-20 Jul  066/066/066
  90 Day Mean        17 Jul 067
V. Geomagnetic A Indices
  Observed Afr/Ap 16 Jul  004/007
  Estimated     Afr/Ap 17 Jul  005/005
  Predicted    Afr/Ap 18 Jul-20 Jul  005/008-005/005-005/005
VI. Geomagnetic Activity Probabilities 18 Jul to 20 Jul
A. Middle Latitudes
Active10%10%10%
Minor storm01%01%01%
Major-severe storm01%01%01%
B. High Latitudes
Active30%10%10%
Minor storm10%05%05%
Major-severe storm05%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, Yellowknife, NT
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
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 direction of the interplanetary magnetic field is slightly South (-5.43nT).
The Disturbance Storm Time index predicts moderate storm conditions right now (-52nT)

S1 - Minor solar radiation storm

Minor impacts on HF radio through polar regions

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