Viewing archive of Wednesday, 25 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 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 238 Issued at 2200Z on 25 Aug 2004IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity was at low levels today. Region 661
(N06W86) produced the largest flare of the period, a C1 x-ray flare
that occurred at 24/2112Z. This region underwent little change
today and has begun to exit the west solar limb. Region 662
(N14W67) produced a B5 x-ray flare that had an associated Type II
radio sweep with an estimated shock speed of 800 km/s. A CME was
observed in SOHO/LASCO imagery shortly following this event which
does not appear to be Earth directed. There was some sporadic
activity seen on the southeast solar limb today that is expected to
be associated with the return of old Region 655. No new regions
were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
very low to low levels.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic field was at quiet to unsettled levels today. The
greater than 2 MeV electron flux at geosynchronous orbit reached
high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet to unsettled levels throughout the period.
III. Event Probabilities 26 Aug to 28 Aug
| Class M | 01% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Aug 100 Predicted 26 Aug-28 Aug 095/090/090 90 Day Mean 25 Aug 110
V. Geomagnetic A Indices
Observed Afr/Ap 24 Aug 003/005 Estimated Afr/Ap 25 Aug 004/010 Predicted Afr/Ap 26 Aug-28 Aug 006/008-006/008-006/008
VI. Geomagnetic Activity Probabilities 26 Aug to 28 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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