Viewing archive of Saturday, 21 July 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 Jul 21 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 202 Issued at 2200Z on 21 Jul 2007IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity was very low. The visible solar disk is
spotless.
IB. Solar Activity Forecast
Solar activity is expected to remain
very low.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic field was predominantly quiet to unsettled. A single
period of minor storming occurred between 21/0300Z and 0600Z due to
a coronal hole high speed stream. Solar wind speed at ACE reached a
peak of 573 km/s at 21/0340Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet for the next three days (22-24 July).
III. Event Probabilities 22 Jul to 24 Jul
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Jul 066 Predicted 22 Jul-24 Jul 068/068/068 90 Day Mean 21 Jul 074
V. Geomagnetic A Indices
Observed Afr/Ap 20 Jul 009/012 Estimated Afr/Ap 21 Jul 010/010 Predicted Afr/Ap 22 Jul-24 Jul 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 22 Jul to 24 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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