Viewing archive of Sunday, 9 January 2011
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 2011 Jan 09 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 009 Issued at 2200Z on 09 Jan 2011IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z Solar activity remained at very low levels. Region 1140
(N32W49) produced a B1 flare at 09/1351Z. Region 1140 showed signs
of decay with the loss of spots in the positive-polarity field just
north of the main spot and was classified as an Hsx group. The
remaining spot groups were A- and B-types with simple magnetic
configurations, including newly numbered Regions 1144 (S16W36) and
1145 (N15E35).
IB. Solar Activity Forecast
Solar activity is expected to be at
very low levels through the period (10 - 12 January).
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
Geomagnetic field activity remained at quiet to unsettled levels. ACE
solar wind measurements indicated Earth remained within a recurrent
coronal hole high-speed stream. Solar wind velocities were variable
in the 554 to 648 km/s range. IMF Bt showed a gradual increase with
a peak value of 6 nT observed late in the period. IMF Bz was
variable and ranged from +5 to -4 nT during the period. The greater
than 2 MeV electron flux at geosynchronous orbit reached high levels
during the period.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at quiet to unsettled levels during day 1 (10
January) as the coronal hole high-speed stream persists. Field
activity is expected to decrease to quiet levels during days 2 - 3
(11 - 12 January) as the high-speed stream subsides.
III. Event Probabilities 10 Jan to 12 Jan
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 09 Jan 083 Predicted 10 Jan-12 Jan 082/082/080 90 Day Mean 09 Jan 084
V. Geomagnetic A Indices
Observed Afr/Ap 08 Jan 006/007 Estimated Afr/Ap 09 Jan 004/005 Predicted Afr/Ap 10 Jan-12 Jan 007/008-005/005-005/005
VI. Geomagnetic Activity Probabilities 10 Jan to 12 Jan
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 05% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 10% |
| Minor storm | 10% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
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