Viewing archive of Saturday, 26 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 26 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 269 Issued at 2200Z on 26 Sep 2009IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity was very low. Region 1027 (N24W21) has
shown little change and remains a simple beta group. Region 1026
(S34E05) is a spotless plage region today. No significant flares
were observed during the past 24 hours.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic field was quiet. An increase in solar wind speed,
density, and temperature were observed from the ACE spacecraft
around 26/1130Z. These signatures are an indication of a possible
weak co-rotating interaction region.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled for day one (27 September) due to
effects from a coronal hole high speed stream. Predominantly quiet
conditions are expected for days two and three (28-29 September).
III. Event Probabilities 27 Sep to 29 Sep
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Sep 072 Predicted 27 Sep-29 Sep 072/070/070 90 Day Mean 26 Sep 068
V. Geomagnetic A Indices
Observed Afr/Ap 25 Sep 001/002 Estimated Afr/Ap 26 Sep 003/005 Predicted Afr/Ap 27 Sep-29 Sep 006/007-005/005-005/005
VI. Geomagnetic Activity Probabilities 27 Sep to 29 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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