Viewing archive of Thursday, 4 September 2003
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 2003 Sep 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 247 Issued at 2200Z on 04 Sep 2003IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z Solar activity was low. A single C1 flare was observed
at 04/1449Z. The likely source of this small flare was Region 452
(S08W84). New Region 453 (S23W44), numbered today as a D-class beta
group, emerged rather quickly over the past 24 hours and exhibited
occasional plage intensity fluctuations. New Region 454 (S10E22)
was also numbered today. The remaining active regions were either
steady or in decay.
IB. Solar Activity Forecast
Solar activity is expected to continue
at low levels. Isolated low C-class flares are likely.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic field was unsettled to active. This weak disturbance
is due to a high speed coronal hole stream. Solar wind speeds began
the period slightly elevated near 500 km/s, but gradually increased
to 650 - 700 km/s by the latter half of the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to continue at unsettled to active levels through day one.
The high speed solar wind speed is expected to subside by day 2
resulting in a return to quiet to unsettled levels.
III. Event Probabilities 05 Sep to 07 Sep
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Sep 112 Predicted 05 Sep-07 Sep 115/120/125 90 Day Mean 04 Sep 126
V. Geomagnetic A Indices
Observed Afr/Ap 03 Sep 014/017 Estimated Afr/Ap 04 Sep 018/018 Predicted Afr/Ap 05 Sep-07 Sep 018/020-010/012-010/012
VI. Geomagnetic Activity Probabilities 05 Sep to 07 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 25% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 05% | 01% | 01% |
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