Viewing archive of Tuesday, 28 October 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 Oct 28 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 302 Issued at 2200Z on 28 Oct 2008IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z Solar activity was very low. No flares were observed.
The visible disk was spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
Geomagnetic field activity was at quiet levels during the period. ACE
solar wind measurements indicated the onset of a recurrent coronal
hole high-speed wind stream. Solar wind velocities gradually
increased from 300 - 490 km/sec during the period. IMF Bt also
increased and reached a peak of 14 nT late in the period. IMF Bz was
mostly northward and ranged from +09 to -08 nT.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at unsettled to active levels during days 1 - 2 (29 -
30 October) due to a recurrent coronal hole high-speed solar wind
stream. There will also be a chance for minor storm levels on 30
October. Geomagnetic field activity is expected to decrease to
unsettled levels on day 3 (31 October) as coronal hole effects
subside.
III. Event Probabilities 29 Oct to 31 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 Oct 067 Predicted 29 Oct-31 Oct 067/067/068 90 Day Mean 28 Oct 067
V. Geomagnetic A Indices
Observed Afr/Ap 27 Oct 001/001 Estimated Afr/Ap 28 Oct 007/008 Predicted Afr/Ap 29 Oct-31 Oct 010/012-010/015-008/010
VI. Geomagnetic Activity Probabilities 29 Oct to 31 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 20% |
| Minor storm | 15% | 15% | 10% |
| Major-severe storm | 05% | 05% | 01% |
All times in UTC
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