Viewing archive of Sunday, 11 December 2005
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 2005 Dec 11 2247 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 345 Issued at 2200Z on 11 Dec 2005IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z Solar activity was low during the past 24 hours due to
one C-class flare, a C1 at 1338Z from Region 835 (N18E55). This
group is the largest on the disk at 220 millionths and appears to
have a simple beta magnetic class.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low for the next three days (12-14 December).
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
The geomagnetic field ranged from quiet to active levels, with a
minor storm period at high latitudes from 1500-2100Z. Solar wind
speed showed an increase up to 550-660 km/s after 0800Z which was
accompanied by enhanced interplanetary magnetic field and
temperature. The velocity appeared to be slowly declining after
1500Z. These solar wind signatures are consistent with a small
coronal-hole-high-speed stream.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly unsettled for the next 24 hours (12 December)
with a chance for isolated active periods. Quiet to unsettled levels
are expected for 13 December followed by generally quiet conditions
for 14 December.
III. Event Probabilities 12 Dec to 14 Dec
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 11 Dec 093 Predicted 12 Dec-14 Dec 095/095/095 90 Day Mean 11 Dec 085
V. Geomagnetic A Indices
Observed Afr/Ap 10 Dec 017/012 Estimated Afr/Ap 11 Dec 010/014 Predicted Afr/Ap 12 Dec-14 Dec 008/014-005/010-005/005
VI. Geomagnetic Activity Probabilities 12 Dec to 14 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 25% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 05% | 01% | 01% |
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