Viewing archive of Friday, 24 September 2010
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 2010 Sep 24 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 267 Issued at 2200Z on 24 Sep 2010IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z
Solar activity was at very low levels during the past
24 hours. Region 1109 (N22E41) produced several small B-class
events. Region 1109, an Eho spot group, increased in extent and
areal coverage and maintained a beta magnetic configuration. Region
1108 (S30W34) remained unchanged.
IB. Solar Activity Forecast
Solar activity is expected to be at
very low to low levels with C-class activity likely. A slight chance
for an M-class event exists from Region 1109.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
The geomagnetic field was at predominantly unsettled levels over the
past 24 hours due to the presence of a recurrent coronal hole high
speed stream. Solar wind velocities increased steadily over the
past 24 hours and ended the period near 600 km/s.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled on day one (25 September) due to
the continued presence of a recurrent coronal hole high speed
stream. Quiet levels are expected on days two and three (26-27
September).
III. Event Probabilities 25 Sep to 27 Sep
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 24 Sep 083 Predicted 25 Sep-27 Sep 084/084/084 90 Day Mean 24 Sep 079
V. Geomagnetic A Indices
Observed Afr/Ap 23 Sep 006/005 Estimated Afr/Ap 24 Sep 010/010 Predicted Afr/Ap 25 Sep-27 Sep 008/010-005/005-005/005
VI. Geomagnetic Activity Probabilities 25 Sep to 27 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 05% | 05% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 05% | 05% |
| Minor storm | 10% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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