Viewing archive of Saturday, 19 September 2009
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 2009 Sep 19 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 262 Issued at 2200Z on 19 Sep 2009IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity was very low. No flares occurred and the
solar disk continues to be void of sunspots. There are indications,
however, of a possible new active region behind the east limb based
on Stereo-B EUVI and GOES-14 SXI imagery.
IB. Solar Activity Forecast
Solar activity is expected to be very
low. A gradual increase in background levels is expected and a
slight chance for an isolated B-class flare is anticipated as the
new region rotates onto the disk.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic field was quiet during the past 24 hours.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet for the next three days (20-22 September).
III. Event Probabilities 20 Sep to 22 Sep
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Sep 071 Predicted 20 Sep-22 Sep 072/074/076 90 Day Mean 19 Sep 068
V. Geomagnetic A Indices
Observed Afr/Ap 18 Sep 002/003 Estimated Afr/Ap 19 Sep 002/002 Predicted Afr/Ap 20 Sep-22 Sep 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 20 Sep to 22 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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