Viewing archive of Saturday, 22 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 22 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 266 Issued at 2200Z on 22 Sep 2012IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z Solar activity was at very low levels. The largest
event of the period was a long duration B9 x-ray event at 22/2010Z
from an area of enhanced emission located behind the east limb near
S15. New Region 1577 (N08E43) emerged on the disk as a stable,
4-spot bipolar group. Region 1575 (N08E24) increased in magnetic
complexity to a beta-gamma configuration. The remainder of the disk
and limb was quiet and stable. No Earth-directed CMEs were
observed.
IB. Solar Activity Forecast
Solar activity is expected to be at
predominately low levels all three days of the forecast period (23 -
25 September). A slight chance for M-class activity exists for day
three as active regions are expected to rotate onto the visible
disk.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
The geomagnetic field was at quiet levels. ACE satellite
measurements indicated a steady decline in wind velocity from about
500 km/s to near 400 km/s while the Bz component of the
interplanetary magnetic field did not vary much beyond +/- 4 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at predominately quiet levels all three days of the
forecast period (23 - 25 September).
III. Event Probabilities 23 Sep to 25 Sep
| Class M | 05% | 05% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 22 Sep 125 Predicted 23 Sep-25 Sep 125/125/130 90 Day Mean 22 Sep 123
V. Geomagnetic A Indices
Observed Afr/Ap 21 Sep 005/006 Estimated Afr/Ap 22 Sep 004/004 Predicted Afr/Ap 23 Sep-25 Sep 005/005-004/005-005/005
VI. Geomagnetic Activity Probabilities 23 Sep to 25 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
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