Viewing archive of Sunday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 361 Issued at 2200Z on 26 Dec 2004IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity was very low. Region 713 (S08W47)
produced a B9.9 flare at 26/1240Z. Region 713 is still in a decay
phase. A long duration B4.3 flare was observed on SXI imagery at
26/1929Z from a spotless plage region at S16E40.
IB. Solar Activity Forecast
Solar activity is expected to be very
low with a chance for isolated C-class activity from Region 713.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic field was quiet to unsettled. The solar wind speed
is still elevated around 500 km/s due to the continued influence of
a geoeffective high speed coronal hole stream.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled with a chance for isolated active
periods at high latitudes on 27 December. Expect quiet to unsettled
on 28 and 29 December.
III. Event Probabilities 27 Dec to 29 Dec
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Dec 092 Predicted 27 Dec-29 Dec 090/090/090 90 Day Mean 26 Dec 104
V. Geomagnetic A Indices
Observed Afr/Ap 25 Dec 006/012 Estimated Afr/Ap 26 Dec 008/010 Predicted Afr/Ap 27 Dec-29 Dec 008/010-006/008-005/005
VI. Geomagnetic Activity Probabilities 27 Dec to 29 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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