Viewing archive of Saturday, 8 September 2012
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 2012 Sep 08 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 252 Issued at 2200Z on 08 Sep 2012IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z
Solar activity was moderate. A long duration M1 flare
was observed at 08/1759Z and appeared to involve an interaction
between Region 1564 (S13W39) and Region 1562 (S21W77). Region 1564
ended the period as the largest on the visible disk, an Eai type
group with beta-gamma magnetic characteristics. A coronal mass
ejection was observed off the west limb in SOHO/LASCO C2 imagery
beginning at 08/10Z. It appeared as a full halo in STEREO-A COR2
imagery. This CME is not expected to be geoeffective.
IB. Solar Activity Forecast
Solar activity is expected to remain
low with a chance for an M-flare on days one and two (09-10
September), decreasing to a slight chance on day three (11
September).
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
The geomagnetic field ranged from quiet to unsettled levels, with one
period of active conditions observed at high latitudes. The solar
wind speed at the ACE spacecraft remained near 400 km/s throughout
the period. The Bz component of the interplanetary magnetic field
ranged from about +/- 5nT and earth remained in the positive sector.
A slow rise in high energy particles at ACE was observed beginning
around 09/11Z. This rise is believed to be associated with the CME
observed around 09/10Z in coronagraph imagery.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly quiet for the next three days (09-11
September).
III. Event Probabilities 09 Sep to 11 Sep
| Class M | 20% | 20% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 08 Sep 129 Predicted 09 Sep-11 Sep 125/115/110 90 Day Mean 08 Sep 124
V. Geomagnetic A Indices
Observed Afr/Ap 07 Sep 008/009 Estimated Afr/Ap 08 Sep 007/008 Predicted Afr/Ap 09 Sep-11 Sep 007/007-007/007-006/005
VI. Geomagnetic Activity Probabilities 09 Sep to 11 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 10% | 10% | 10% |
All times in UTC
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