Viewing archive of Wednesday, 12 September 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 Sep 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 256 Issued at 2200Z on 12 Sep 2012IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z
Solar activity was at low levels. Region 1564 (S13W95)
was the most active sunspot group, producing several C-class flares
as it rotated off the west limb. The largest flare produced was a
long duration C4 at 11/2207Z. Two new B-type Cso regions were
numbered; Region 1570 (S13W34) emerged while 1571 (S12E57) rotated
onto the disk. There was no Earth directed CME activity during the
period.
IB. Solar Activity Forecast
Solar activity is expected to be low
with a slight chance for an isolated M-class flare on day 1 (13
September). M-class probability is expected to decrease for the
second and third days (14-15 September) as Region 1564 rotates
further beyond the limb.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
Geomagnetic field activity was at mostly quiet levels. There was an
isolated period of major storming at high latitudes during
12/09-12Z. A solar sector boundary crossing was observed at the ACE
spacecraft at about 11/2200Z. The greater than 2 MeV electron flux
at geosynchronous orbit reached high levels during the period.
IIB. Geophysical Activity Forecast
Geomagnetic activity is
expected to be quiet with a slight chance for unsettled levels on
days 1 and 2 (13-14 September). An increase to quiet to unsettled
levels with a slight chance for an active period is expected on the
third day (15 September) due to a favorably positioned coronal hole.
III. Event Probabilities 13 Sep to 15 Sep
| Class M | 10% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 12 Sep 103 Predicted 13 Sep-15 Sep 100/095/095 90 Day Mean 12 Sep 123
V. Geomagnetic A Indices
Observed Afr/Ap 11 Sep 003/002 Estimated Afr/Ap 12 Sep 004/006 Predicted Afr/Ap 13 Sep-15 Sep 004/005-004/007-009/010
VI. Geomagnetic Activity Probabilities 13 Sep to 15 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 10% |
All times in UTC
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