Viewing archive of Thursday, 1 September 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 Sep 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 244 Issued at 2200Z on 01 Sep 2011IA. Analysis of Solar Active Regions and Activity from 31-2100Z to 01-2100Z Solar activity was low. Region 1283 (N12E49) produced
two C2/Sf flares during the period, the first one at 01/1248Z and
the second one at 01/1822Z. The region exhibited trailer spot growth
and remained a beta magnetic configuration. Region 1282 (N25W26) had
intermediate spot decay between the leader and trailer, but some
growth in the leader section of the region. The remainder of the
regions were quiet and stable. No Earth-directed CMEs were detected
during the period.
IB. Solar Activity Forecast
Solar activity is expected to be low
through the period (02 - 04 September) with a slight chance for
M-class activity.
IIA. Geophysical Activity Summary 31-2100Z to 01-2100Z
The geomagnetic field was quiet. Solar wind speeds, as measured at
the ACE satellite, showed a steady decline from about 350 km/s to
end the period near 290 km/s. The Bz component of the interplanetary
magnetic field did not vary much beyond +/- 2 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet levels during day one (02 September).
Activity is expected to increase to quiet to unsettled levels, with
isolated active periods, on days two and three (03 - 04 September).
This increase in activity is due to a recurrent coronal hole high
speed stream that is expected to rotate into a geoeffective
position.
III. Event Probabilities 02 Sep to 04 Sep
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 01 Sep 112 Predicted 02 Sep-04 Sep 110/110/110 90 Day Mean 01 Sep 097
V. Geomagnetic A Indices
Observed Afr/Ap 31 Aug 001/002 Estimated Afr/Ap 01 Sep 002/005 Predicted Afr/Ap 02 Sep-04 Sep 005/005-008/008-008/008
VI. Geomagnetic Activity Probabilities 02 Sep to 04 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 20% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 25% | 25% |
| Minor storm | 01% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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