Viewing archive of Wednesday, 31 December 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 Dec 31 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 366 Issued at 2200Z on 31 Dec 2008IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z 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 30-2100Z to 31-2100Z
Geomagnetic field activity ranged from quiet to active levels. ACE
solar wind measurements indicated a recurrent coronal hole
high-speed stream began early in the summary period. Velocities
gradually increased from 305 to 559 km/sec during the period. IMF
changes associated with the transition to the high-speed stream
included increased Bt (peak 17 nT at 31/0000Z) and intermittent
periods of southward Bz (minimum -16 nT at 31/0131Z).
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to range from quiet to active levels during days 1 - 2
(January 1 - 2) as the coronal hole high-speed stream continues.
Activity is expected to decrease to quiet to unsettled levels on day
3 (3 January) as the high-speed stream subsides.
III. Event Probabilities 01 Jan to 03 Jan
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 31 Dec 069 Predicted 01 Jan-03 Jan 069/069/069 90 Day Mean 31 Dec 069
V. Geomagnetic A Indices
Observed Afr/Ap 30 Dec 001/001 Estimated Afr/Ap 31 Dec 012/008 Predicted Afr/Ap 01 Jan-03 Jan 008/008-012/012-008/008
VI. Geomagnetic Activity Probabilities 01 Jan to 03 Jan
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 15% |
| Minor storm | 05% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 30% | 20% |
| Minor storm | 10% | 15% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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