Viewing archive of Sunday, 7 August 2011
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 2011 Aug 07 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 219 Issued at 2200Z on 07 Aug 2011IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z Solar activity was low. Only low level C-flares were
observed from Regions 1263 (N17W55) and 1267 (S17W00). Region 1263
exhibited motion and growth within its central and trailing spots;
merging of trailing spots with the central spots produced an
additional delta configuration in the group.
IB. Solar Activity Forecast
Solar activity is expected to be at
moderate levels. M-flares are likely and there is a slight chance
for an X-flare and/or proton event with Region 1263 as the most
likely source.
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
The geomagnetic field was quiet to unsettled. The solar wind speed
increased to 600 km/s at the beginning of the period and has been
slowly decreasing since approximately 06/2218Z. The solar sector
(phi angle) remained generally positive suggesting the presence of a
coronal hole high speed stream. The period ended with solar wind
speed around 500 km/s.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled on 08 August as the effects of the
high speed stream weaken. Mostly quiet conditions are expected on
09-10 August.
III. Event Probabilities 08 Aug to 10 Aug
| Class M | 60% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 07 Aug 105 Predicted 08 Aug-10 Aug 100/095/085 90 Day Mean 07 Aug 096
V. Geomagnetic A Indices
Observed Afr/Ap 06 Aug 014/031 Estimated Afr/Ap 07 Aug 008/010 Predicted Afr/Ap 08 Aug-10 Aug 008/012-005/005-005/005
VI. Geomagnetic Activity Probabilities 08 Aug to 10 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 05% | 05% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 05% | 05% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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