Viewing archive of Monday, 26 August 2002
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 2002 Aug 26 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 26 Aug 2002IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity was moderate. Region 83 (S19W56)
produced two small M-class flares, an M1/Sf at 25/2346 UTC and an
M1/Sf at 26/0103 UTC. In addition, several C-class subflares
occurred in Region 85 (S09W19). The largest was a C4/Sf at 26/0945
UTC. New Region 90 (S03E48) was numbered.
IB. Solar Activity Forecast
Solar activity is expected to be low
to moderate.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic field ranged from quiet to major storm levels. A
shock in the solar wind was observed by the NASA ACE spacecraft at
26/1048 UTC. The most active 3-hour geomagnetic period was 26/1500
to 1800 UTC. This activity is believed to be related to the M5
flare/CME event which occurred on 22 August. The greater than 10 MeV
proton event ended at 26/1335 UTC (start at 24/0140 UTC and 317 pfu
peak at 24/0835 UTC).
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be unsettled to active becoming quiet to unsettled over
the next 24 hours.
III. Event Probabilities 27 Aug to 29 Aug
| Class M | 40% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Aug 169 Predicted 27 Aug-29 Aug 160/155/150 90 Day Mean 26 Aug 170
V. Geomagnetic A Indices
Observed Afr/Ap 25 Aug 004/009 Estimated Afr/Ap 26 Aug 016/018 Predicted Afr/Ap 27 Aug-29 Aug 012/015-008/010-008/008
VI. Geomagnetic Activity Probabilities 27 Aug to 29 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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