Viewing archive of Sunday, 11 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 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 345 Issued at 2200Z on 11 Dec 2011IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z Solar activity was at very low levels with only B-class
activity observed. Two filament eruptions were observed during the
period. A 40 degree long filament, centered near N25E25, was first
observed erupting at about 11/0600Z. Shortly after, a 10 degree
long filament, centered near N30W17, was first observed lifting off
at about 11/0900Z. Stereo-A COR2 imagery observed a pair of CMEs
off the NE limb at 11/0754Z and 11/1024Z as a result of the filament
activity. At this time, neither of these CMEs are expected to be
geoeffective.
IB. Solar Activity Forecast
Solar activity is expected to be at
low levels with a slight chance for M-class activity all three days
of the period (12 - 14 December).
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
The geomagnetic field was at quiet to unsettled levels. Solar wind
velocities generally varied between 450 to 500 km/s while the Bz
component of the interplanetary magnetic field did not vary much
beyond +/- 5 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at mostly quiet levels all three days of the period
(12 - 14 December).
III. Event Probabilities 12 Dec to 14 Dec
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 11 Dec 134 Predicted 12 Dec-14 Dec 135/135/135 90 Day Mean 11 Dec 146
V. Geomagnetic A Indices
Observed Afr/Ap 10 Dec 006/008 Estimated Afr/Ap 11 Dec 006/005 Predicted Afr/Ap 12 Dec-14 Dec 006/005-006/005-005/005
VI. Geomagnetic Activity Probabilities 12 Dec to 14 Dec
| 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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