Viewing archive of Sunday, 8 September 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 Sep 08 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 251 Issued at 2200Z on 08 Sep 2002IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z Solar activity was moderate. Region 105 (S07E66)
produced an M1/Sf flare at 08/0143 UTC. This sunspot group is still
near the east limb but appears to be a fairly large, elongated
F-type region. Other regions currently on the disk are relatively
small and magnetically simple. New Regions 106 (N28E50) and 107
(N11E70) were numbered. Region 107 generated a number of subflares
today, the largest being a C4/Sf at 08/1457 UTC.
IB. Solar Activity Forecast
Solar activity is expected to be
moderate. Region 105 is the most likely source of energetic flares.
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
The geomagnetic field ranged from quiet to major storm levels. The
disturbance which began yesterday has ended. Activity has been at
quiet to unsettled levels since about 08/0600 UTC. The greater than
10 MeV proton event ended at 08/0145 UTC (start: 07/0440 UTC and 208
pfu peak: 07/1650 UTC).
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled. Activity levels may increase by
the end of the three-day forecast period in response to an extension
of the south polar coronal hole.
III. Event Probabilities 09 Sep to 11 Sep
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 08 Sep 192 Predicted 09 Sep-11 Sep 200/210/220 90 Day Mean 08 Sep 171
V. Geomagnetic A Indices
Observed Afr/Ap 07 Sep 024/045 Estimated Afr/Ap 08 Sep 014/030 Predicted Afr/Ap 09 Sep-11 Sep 010/012-008/008-012/015
VI. Geomagnetic Activity Probabilities 09 Sep to 11 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
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