Viewing archive of Thursday, 12 August 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 Aug 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 225 Issued at 2200Z on 12 Aug 2004IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z Solar activity was moderate. Region 656 (S13W09)
produced one M-class flare during the past 24 hours, an M1/1f at
0505UTC. The remainder of the day's activity consisted of occasional
C-class flares from Region 656. This region continues to grow and
has an area of about 1320 millionths. It also continues to be
magnetically complex and is classified as a beta-gamma-delta
magnetic configuration. Old Region 652 quietly rotated around the
east limb and was assigned as Region 661 (N08E84).
IB. Solar Activity Forecast
Solar activity is expected to be
moderate, and Region 656 is expected to dominate activity. There is
a chance during the next three days for an isolated major flare
event from Region 656.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
The geomagnetic field was quiet to unsettled. Solar wind data shows
the continuing presence of a high speed coronal hole stream, but the
influence on geomagnetic activity is weakening as the velocity is
declining. The greater than 2 MeV electron flux reached high levels
during the past 24 hours.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly unsettled for tomorrow (13 August). Conditions
are expected to increase slightly to unsettled to active on the 2nd
day (14 August) with the arrival of a slow CME that was observed
late on 10 August. Conditions should return to mostly unsettled for
the third day (15 August).
III. Event Probabilities 13 Aug to 15 Aug
| Class M | 70% | 70% | 70% |
| Class X | 20% | 20% | 20% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 12 Aug 147 Predicted 13 Aug-15 Aug 150/155/165 90 Day Mean 12 Aug 107
V. Geomagnetic A Indices
Observed Afr/Ap 11 Aug 010/013 Estimated Afr/Ap 12 Aug 010/010 Predicted Afr/Ap 13 Aug-15 Aug 010/010-015/012-010/010
VI. Geomagnetic Activity Probabilities 13 Aug to 15 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 35% | 30% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 40% | 35% |
| Minor storm | 15% | 20% | 15% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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