Viewing archive of Thursday, 4 September 2008
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 2008 Sep 04 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 248 Issued at 2200Z on 04 Sep 2008IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z Solar activity was very low. No flares occurred during
the past 24 hours. The solar disk continues to be spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic field was initially quiet to unsettled, but activity
increased to minor to major storm levels from 0000-0600Z. Active
levels prevailed from 0600-1500Z, after which conditions decreased
to unsettled levels. The activity was driven by a prolonged period
of southward Bz (about -10 nT) occurring together with elevated
solar wind speeds. Solar wind velocity continued to rise during the
past 24 hours with day-end values near 600 km/s. The solar wind
signatures are generally consistent with a high speed stream from a
coronal hole. The greater than 2 MeV electron flux at geosynchronous
orbit reached high levels during the past 24 hours.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be unsettled to active for the first day (05 September)
as the high speed wind stream is expected to continue. Conditions
should gradually decline to predominantly unsettled for the second
day (06 September) and quiet to unsettled for the third day (07
September).
III. Event Probabilities 05 Sep to 07 Sep
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Sep 066 Predicted 05 Sep-07 Sep 066/066/066 90 Day Mean 04 Sep 066
V. Geomagnetic A Indices
Observed Afr/Ap 03 Sep 007/007 Estimated Afr/Ap 04 Sep 020/020 Predicted Afr/Ap 05 Sep-07 Sep 015/020-010/015-005/008
VI. Geomagnetic Activity Probabilities 05 Sep to 07 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 50% | 25% | 15% |
| Minor storm | 25% | 15% | 05% |
| Major-severe storm | 10% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 50% | 30% | 20% |
| Minor storm | 30% | 20% | 10% |
| Major-severe storm | 15% | 10% | 05% |
All times in UTC
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