Viewing archive of Sunday, 21 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 21 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 294 Issued at 2200Z on 21 Oct 2007IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity was very low. No flares were observed
during the past 24 hours, and the visible disk remained spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic field was quiet. Real-time solar wind observations
from ACE show solar wind velocity gradually declined during the past
24 hours to approximately 455 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 on 22 October. Quiet to unsettled levels are
expected on 23 October. Expect conditions to range from quiet to
active levels on 24 October, with a chance for minor storm periods,
as a recurrent coronal hole becomes geoeffective.
III. Event Probabilities 22 Oct to 24 Oct
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Oct 067 Predicted 22 Oct-24 Oct 067/067/067 90 Day Mean 21 Oct 068
V. Geomagnetic A Indices
Observed Afr/Ap 20 Oct 008/012 Estimated Afr/Ap 21 Oct 003/005 Predicted Afr/Ap 22 Oct-24 Oct 005/005-005/008-010/015
VI. Geomagnetic Activity Probabilities 22 Oct to 24 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 25% |
| Minor storm | 05% | 05% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 30% |
| Minor storm | 05% | 05% | 20% |
| Major-severe storm | 01% | 01% | 10% |
All times in UTC
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