Viewing archive of Friday, 23 October 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 Oct 23 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 296 Issued at 2200Z on 23 Oct 2009IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z Solar activity was very low. No flares were detected.
New Region 1029 (N14E14) was numbered. Region 1029 is a nine-spot
bi-polar sunspot group.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
Geomagnetic field activity was at quiet to active levels. Solar wind
speed ranged from approximately 370 to 400 km/s, while Bz reached a
minimum of -9 nT.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be mostly quiet to unsettled with isolated active
periods for the next two days (24 - 25 October) in response to a
recurrent coronal hole high speed stream. Quiet conditions are
expected on day three (26 October).
III. Event Probabilities 24 Oct to 26 Oct
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 23 Oct 073 Predicted 24 Oct-26 Oct 072/072/072 90 Day Mean 23 Oct 069
V. Geomagnetic A Indices
Observed Afr/Ap 22 Oct 012/014 Estimated Afr/Ap 23 Oct 010/010 Predicted Afr/Ap 24 Oct-26 Oct 010/010-010/010-005/005
VI. Geomagnetic Activity Probabilities 24 Oct to 26 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 10% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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