Viewing archive of Wednesday, 14 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 14 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 257 Issued at 2200Z on 14 Sep 2011IA. Analysis of Solar Active Regions and Activity from 13-2100Z to 14-2100Z Solar activity remained low. Seven C-class flares were
observed during the period. The largest was a C9/1f flare observed
at 14/2051Z from Region 1297 (S16W52). A full halo CME was observed
from SOHO NASA LASCO C2 images at 14/0000Z with an estimated
plane-of-sky speed of 428 km/s. The source of the CME was an
eruption in the vicinity of Region 1289 (N24W25).
IB. Solar Activity Forecast
Solar activity is expected to be low
with a chance for isolated M-class flares for the period (15-17
September).
IIA. Geophysical Activity Summary 13-2100Z to 14-2100Z
The geomagnetic field was quiet. 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 predominantly quiet levels for the period (15-17
September). The CME is expected to be geoeffective.
III. Event Probabilities 15 Sep to 17 Sep
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 14 Sep 143 Predicted 15 Sep-17 Sep 145/145/145 90 Day Mean 14 Sep 101
V. Geomagnetic A Indices
Observed Afr/Ap 13 Sep 011/017 Estimated Afr/Ap 14 Sep 004/005 Predicted Afr/Ap 15 Sep-17 Sep 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 15 Sep to 17 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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