Viewing archive of Sunday, 13 January 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 Jan 13 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 013 Issued at 2200Z on 13 Jan 2008IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z Solar activity was very low.
IB. Solar Activity Forecast
Solar activity is expected to remain
very low.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic field was unsettled to active. The high speed stream
that began yesterday was briefly interrupted during this period.
The solar wind at ACE reached approximately 590 km/s at 2300Z
yesterday before declining to 450 km/s from 0800Z until 1400Z. This
slack period was accompanied by increased density and decreased
temperature. At 1400Z, these trends all reversed and the wind speed
leveled off at approximately 550 km/s by 1600Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be unsettled to active at mid latitudes with a chance
for minor storm periods at high latitudes. Data from STEREO-Behind
suggest a continued increase in solar wind speed through day 2 (15
Jan) reflecting the continued influence of the coronal hole high
speed stream.
III. Event Probabilities 14 Jan to 16 Jan
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 13 Jan 075 Predicted 14 Jan-16 Jan 075/070/070 90 Day Mean 13 Jan 073
V. Geomagnetic A Indices
Observed Afr/Ap 12 Jan 004/009 Estimated Afr/Ap 13 Jan 014/015 Predicted Afr/Ap 14 Jan-16 Jan 012/015-012/015-012/012
VI. Geomagnetic Activity Probabilities 14 Jan to 16 Jan
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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