Viewing archive of Tuesday, 28 December 2004
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 2004 Dec 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 363 Issued at 2200Z on 28 Dec 2004IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z Solar activity increased to low levels today. The
plage field in Region 713 (S09W78) showed a significant increase in
coverage along with the production of multiple C-class flares today,
the largest was a C7/1f event that occurred at 28/0010Z. An
increase in the sunspot area and an increase in the magnetic
complexity were observed this period. Region 715 (N04E74) began to
rotate into view and was numbered today. It is already exhibiting a
large asymmetrical sunspot. This region was responsible for the
C7/Sf event that occurred at 28/1801Z.
IB. Solar Activity Forecast
Solar activity is expected to be at
low levels.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic field was at predominantly quiet to unsettled levels.
An isolated active period was observed between 28/1800 and 2100Z,
likely due to a sustained southward Bz which was observed by the ACE
spacecraft.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at predominantly quiet to unsettled levels throughout
the period.
III. Event Probabilities 29 Dec to 31 Dec
| Class M | 15% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Dec 105 Predicted 29 Dec-31 Dec 110/115/115 90 Day Mean 28 Dec 104
V. Geomagnetic A Indices
Observed Afr/Ap 27 Dec 006/007 Estimated Afr/Ap 28 Dec 007/010 Predicted Afr/Ap 29 Dec-31 Dec 005/008-006/008-004/008
VI. Geomagnetic Activity Probabilities 29 Dec to 31 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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