Viewing archive of Saturday, 17 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 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 351 Issued at 2200Z on 17 Dec 2011IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity was low. The largest event in the past
24 hours was a C1 flare at 0501Z from Region 1376 (N21W04). Region
1374 (S18W50) is the largest region on the disk but remains stable
and quiet. New Regions 1379 (S29W22) and 1380 (S20E70) were
assigned.
IB. Solar Activity Forecast
Solar activity is expected to be very
low with a chance for isolated C-class flares.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic field was quiet.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly quiet for the next three days (18-20
December).
III. Event Probabilities 18 Dec to 20 Dec
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Dec 120 Predicted 18 Dec-20 Dec 120/120/120 90 Day Mean 17 Dec 145
V. Geomagnetic A Indices
Observed Afr/Ap 16 Dec 002/000 Estimated Afr/Ap 17 Dec 000/000 Predicted Afr/Ap 18 Dec-20 Dec 006/005-006/005-006/005
VI. Geomagnetic Activity Probabilities 18 Dec to 20 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% | 20% | 10% |
| Major-severe storm | 05% | 10% | 05% |
All times in UTC
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