Viewing archive of Wednesday, 28 September 2005
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 2005 Sep 28 2204 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 271 Issued at 2200Z on 28 Sep 2005IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z Solar activity was very low. Regions 810 (N08W74) and
812 (S02E05) produced no flares and exhibited no significant
development. No new regions were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic field was quiet to active. Solar wind speed remains
low, with end-of-day speeds around 370 km/s. Active periods were
due to sustained southward Bz between 0100 - 0900 UTC.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be unsettled to active with possible isolated minor
storming on 29 September as a recurrent coronal hole high speed
stream moves into geoeffective position. Mostly unsettled
conditions are expected on 30 September and 01 October.
III. Event Probabilities 29 Sep to 01 Oct
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Sep 075 Predicted 29 Sep-01 Oct 075/070/070 90 Day Mean 28 Sep 093
V. Geomagnetic A Indices
Observed Afr/Ap 27 Sep 010/013 Estimated Afr/Ap 28 Sep 010/020 Predicted Afr/Ap 29 Sep-01 Oct 010/020-008/015-008/015
VI. Geomagnetic Activity Probabilities 29 Sep to 01 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 30% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 15% | 10% | 10% |
All times in UTC
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