Viewing archive of Thursday, 20 December 2001
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 2001 Dec 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 354 Issued at 2200Z on 20 Dec 2001IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity was low. Region 9742 (N10E13) produced
several C-class events including a C8 flare at 20/0438Z. This region
exhibited impressive flux emergence and spot growth this period,
almost doubling in size and spot count. Most growth was concentrated
in the trailer portions of the region, but mixed polarities were
obvious throughout the spot group. Regions 9741 (N05W21) and 9747
(N12E58) produced occasional minor C-class flares. Moderately
complex Regions 9733 (N12W88) and 9739 (S14W90) are rotating quietly
around the west limb. A large prominence eruption and associated CME
occurred on the SE limb between 19/2344 - 20/0028Z. New Regions 9748
(S11E36), and 9749 (S08E72) were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
moderate levels. Region 9742 holds good potential for M-class
activity and is developing potential for a major flare.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic field was quiet.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled. Periods of unsettled conditions
are likely on days two and three as a large southern coronal hole
moves into a geoeffectively favorable position.
III. Event Probabilities 21 Dec to 23 Dec
| Class M | 60% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Dec 221 Predicted 21 Dec-23 Dec 215/215/215 90 Day Mean 20 Dec 218
V. Geomagnetic A Indices
Observed Afr/Ap 19 Dec 005/009 Estimated Afr/Ap 20 Dec 005/006 Predicted Afr/Ap 21 Dec-23 Dec 008/008-008/008-010/008
VI. Geomagnetic Activity Probabilities 21 Dec to 23 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 25% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 25% | 25% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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