Viewing archive of Tuesday, 22 December 2009
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 2009 Dec 22 2201 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 2009IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z Solar activity was low. Region 1036 (S27W58) produced a
C7/Sf flare at 22/0456Z associated with a Type II radio sweep
(estimated velocity 531 km/sec) and discrete frequency radio bursts,
the largest of which was 4900 sfu at 245 MHz. There was also a
faint, slow-moving partial-halo coronal mass ejection (CME)
associated with the flare (estimated velocity 300 km/sec). Region
1036 gradually decayed from a D-type to a B-type spot group during
the period. Additional isolated low-level C-class flares and
occasional B-class flares also occurred during the period. Region
1035 (N31W98) crossed the west limb early in the period. No new
regions were numbered.
IB. Solar Activity Forecast
Solar activity is expected to be low
during days 1 - 2 (23 - 24 December) with a slight chance for an
isolated M-class flare. Activity is expected to drop to very low
levels on day 3 (25 December) as Region 1036 departs the west limb.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
Geomagnetic field activity was at quiet levels.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at quiet levels through the period (23 - 25
December). The CME mentioned above is not expected to significantly
disturb the field.
III. Event Probabilities 23 Dec to 25 Dec
| Class M | 10% | 10% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 22 Dec 082 Predicted 23 Dec-25 Dec 078/076/074 90 Day Mean 22 Dec 074
V. Geomagnetic A Indices
Observed Afr/Ap 21 Dec 001/001 Estimated Afr/Ap 22 Dec 001/005 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 | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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