Viewing archive of Thursday, 4 October 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 Oct 04 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 277 Issued at 2200Z on 04 Oct 2007IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z Solar activity was very low. The visible disk remained
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 ranged from quiet to active levels due to a
recurrent coronal hole high speed steam. Earlier on 03 October,
minor to major storm levels were observed at high latitudes between
0600-1500Z due to this high speed stream. Real-time solar wind
speed at ACE reached a maximum of approximately 600 km/s at 04/0102Z
and has gradually decreased to approximately 515 km/s at forecast
issue time. The greater than 2 MeV electron flux at geosynchronous
orbit reached high levels again today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet, with isolated unsettled periods early on day
one (05 October). Quiet conditions are expected for the remainder
of the forecast period.
III. Event Probabilities 05 Oct to 07 Oct
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Oct 067 Predicted 05 Oct-07 Oct 067/067/067 90 Day Mean 04 Oct 069
V. Geomagnetic A Indices
Observed Afr/Ap 03 Oct 009/018 Estimated Afr/Ap 04 Oct 007/010 Predicted Afr/Ap 05 Oct-07 Oct 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 05 Oct to 07 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 05% | 05% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 10% | 10% |
| Minor storm | 10% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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