Viewing archive of Tuesday, 25 November 2008
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 2008 Nov 25 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 330 Issued at 2200Z on 25 Nov 2008IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity was very low. No flares were observed
during the past 24 hours. The visible disk remained spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic field was predominantly unsettled. Solar wind
observations from the ACE spacecraft indicated the onset of a
recurrent coronal hole high-speed stream. Solar wind velocities
gradually increased from 285 km/s to 619 km/s during the period. The
interplanetary magnetic field (IMF) Bt reached a peak of 24 nT early
in the period. The IMF Bz ranged from +18 to -15 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be predominantly unsettled with isolated active periods
possible on 26 November. Isolated periods of minor storm conditions
at high latitudes are also possible on 26 November. Quiet to
unsettled conditions are expected on 27 November. Conditions will
return to quiet on 28 November as the coronal hole high speed
subsides.
III. Event Probabilities 26 Nov to 28 Nov
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Nov 068 Predicted 26 Nov-28 Nov 069/069/069 90 Day Mean 25 Nov 068
V. Geomagnetic A Indices
Observed Afr/Ap 24 Nov 002/000 Estimated Afr/Ap 25 Nov 012/008 Predicted Afr/Ap 26 Nov-28 Nov 010/012-007/008-005/005
VI. Geomagnetic Activity Probabilities 26 Nov to 28 Nov
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 05% |
| Minor storm | 10% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 05% |
| Minor storm | 15% | 10% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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