Viewing archive of Monday, 3 October 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 Oct 03 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 276 Issued at 2200Z on 03 Oct 2011IA. Analysis of Solar Active Regions and Activity from 02-2100Z to 03-2100Z Solar activity has been at low levels for the past 24
hours. Region 1302 (N13W69) produced the largest event of the
period, a C7/2n x-ray flare at 03/0030Z. Region 1302 remains the
largest sunspot group on the visible disk but has begun to simplify
magnetically and decrease in size. Many of the regions on the disk,
also appear to be in a waning phase. In the southeast quadrant of
the disk, two new flux regions emerged with one becoming new Region
1310 (S33E16).
IB. Solar Activity Forecast
Solar activity is expected to remain
at low levels for the next two days (04-05 October), as Region 1302
rotates off the west limb. Predominantly very low levels are
expected to prevail on day three (06 October).
IIA. Geophysical Activity Summary 02-2100Z to 03-2100Z
The geomagnetic field has been at predominantly quiet levels for the
past 24 hours. Solar wind speeds, as measured by the ACE spacecraft,
show nominal speeds around 400 km/s. The greater than 2 MeV electron
flux at geosynchronous orbit reached high levels during the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet levels on day one (04 October). An increase
to active and possible minor storm levels is expected on days two
and three (05-06 October) as three Earthbound CMEs are forecasted
to arrive.
III. Event Probabilities 04 Oct to 06 Oct
| Class M | 20% | 15% | 01% |
| Class X | 05% | 01% | 01% |
| Proton | 05% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 03 Oct 129 Predicted 04 Oct-06 Oct 125/125/120 90 Day Mean 03 Oct 112
V. Geomagnetic A Indices
Observed Afr/Ap 02 Oct 007/011 Estimated Afr/Ap 03 Oct 003/005 Predicted Afr/Ap 04 Oct-06 Oct 005/005-015/015-018/018
VI. Geomagnetic Activity Probabilities 04 Oct to 06 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 30% | 35% |
| Minor storm | 01% | 15% | 15% |
| Major-severe storm | 01% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 40% | 40% |
| Minor storm | 05% | 30% | 30% |
| Major-severe storm | 01% | 05% | 05% |
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