Viewing archive of Tuesday, 6 September 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 Sep 06 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 249 Issued at 2200Z on 06 Sep 2011IA. Analysis of Solar Active Regions and Activity from 05-2100Z to 06-2100Z
Solar activity increased to high levels. Region 1283
(N14W18) produced an M5/1b flare at 06/0150Z associated with Types
II and IV radio sweeps and an Earth-directed full-halo CME. The CME
had an estimated speed of around 450 km/sec, based upon STEREO-A
COR2 data, with the bulk of the ejecta directed north of the
ecliptic plane. Region 1283 appeared to develop a magnetic delta
configuration in its north-central portion and was classified as an
Eai-type with a beta-gamma-delta magnetic configuration. Old Region
1286 (N20, L = 310) produced multiple CMEs from beyond the west
limb, none of which were Earth-directed. New Region 1289 (N24E78)
was numbered.
IB. Solar Activity Forecast
Solar activity is expected to be
moderate during the period (07 - 09 September) with more M-class
flare activity likely from Region 1283.
IIA. Geophysical Activity Summary 05-2100Z to 06-2100Z
Geomagnetic field activity was at mostly quiet levels. Proton flux
enhancements at greater than 100 MeV and greater than 10 MeV began
around 06/0300Z at geosynchronous orbit in the wake of the M5 flare
mentioned above.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at mostly quiet levels through the period (07 - 09
September). The halo-CME mentioned above is not expected to affect
the field during the forecast period.
III. Event Probabilities 07 Sep to 09 Sep
| Class M | 60% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 06 Sep 112 Predicted 07 Sep-09 Sep 110/105/100 90 Day Mean 06 Sep 098
V. Geomagnetic A Indices
Observed Afr/Ap 05 Sep 004/006 Estimated Afr/Ap 06 Sep 006/007 Predicted Afr/Ap 07 Sep-09 Sep 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 07 Sep to 09 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 | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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