Viewing archive of Saturday, 27 October 2012
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 2012 Oct 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 301 Issued at 2200Z on 27 Oct 2012IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity was low. Three low-level C-class flares
were observed from behind the west limb, likely from old Region 1594
(S27, L=200). Region 1598 (S11W10), a Dkc/Beta-Delta spot group,
remained the most magnetically complex region on the visible disk
and produced a B9/Sf flare at 27/1235Z. Region 1596 (N08W48), a
Dao/Beta-Gamma spot group, has shown signs of penumbral decay,
mainly in its trailer spots. The remaining two spot groups were
stable and unremarkable. A CME was observed in STEREO Ahead COR 2
imagery at 27/1824Z. Further analysis will be performed to
determine its geo-effectiveness as data becomes available.
IB. Solar Activity Forecast
Solar activity is expected to be low
with a slight chance for isolated M-class flares for the next three
days (28-30 October).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic field has been quiet for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, remained steady at
approximately 350 km/s. The Bz component of the interplanetary
magnetic field had minor deflections of +/- 5 nT while the total
field remained steady at 5 nT. The greater than 2 MeV electron flux
at geosynchronous orbit reached high levels during the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to remain quiet for the next three days (28-30 October).
III. Event Probabilities 28 Oct to 30 Oct
| Class M | 15% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Oct 122 Predicted 28 Oct-30 Oct 120/115/110 90 Day Mean 27 Oct 122
V. Geomagnetic A Indices
Observed Afr/Ap 26 Oct 004/004 Estimated Afr/Ap 27 Oct 004/004 Predicted Afr/Ap 28 Oct-30 Oct 006/005-006/005-006/005
VI. Geomagnetic Activity Probabilities 28 Oct to 30 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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