Viewing archive of Saturday, 29 September 2007
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 2007 Sep 29 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 272 Issued at 2200Z on 29 Sep 2007IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z Solar activity was very low. No flares occurred during
the past 24 hours. Region 971 (N03W06) is a small C-type sunspot
group and was quiet and stable.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
The geomagnetic field was at active to minor storm levels from the
beginning of the period through 29/1200Z, and was mostly unsettled
thereafter. Real-time solar wind observations at ACE show that the
activity was due to the ongoing influence of a high speed solar wind
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 mostly unsettled for the first day (30 September)
with a chance for isolated active periods. Activity should decline
to quiet to unsettled for the second and third days (01-02 October).
III. Event Probabilities 30 Sep to 02 Oct
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 29 Sep 068 Predicted 30 Sep-02 Oct 068/068/068 90 Day Mean 29 Sep 069
V. Geomagnetic A Indices
Observed Afr/Ap 28 Sep 015/021 Estimated Afr/Ap 29 Sep 020/025 Predicted Afr/Ap 30 Sep-02 Oct 010/015-007/008-007/010
VI. Geomagnetic Activity Probabilities 30 Sep to 02 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 10% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 10% | 10% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 10% | 01% | 01% |
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