Viewing archive of Thursday, 22 December 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 Dec 22 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 356 Issued at 2200Z on 22 Dec 2011IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z Solar activity was low. Region 1381 (S18W28) produced
a C5/Sf flare at 22/0208Z. This flare was accompanied by Type II
(921 km/s) and Type IV radio emissions with a CME. A faint CME was
observed in STEREO-A COR2 imagery at 22/0509Z. Plane of sky
analysis suggested a speed of roughly 150 km/s for the ejecta.
This event is not expected to be geoeffective. Intermediate spots
diminished in Regions 1384 (N12E37) and 1376 (N18W72) while Regions
1382( S19W21) and 1383 (N03E25) both showed signs of growth.
IB. Solar Activity Forecast
Solar activity is expected to remain
low for the next three days (23-25 December), with a slight chance
for an M-class event.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
The geomagnetic field was quiet.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to remain at mostly quiet levels for the next three days
(23-25 December).
III. Event Probabilities 23 Dec to 25 Dec
| Class M | 15% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 22 Dec 146 Predicted 23 Dec-25 Dec 145/140/140 90 Day Mean 22 Dec 145
V. Geomagnetic A Indices
Observed Afr/Ap 21 Dec 005/004 Estimated Afr/Ap 22 Dec 005/002 Predicted Afr/Ap 23 Dec-25 Dec 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 23 Dec to 25 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
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