Viewing archive of Friday, 30 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 30 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 273 Issued at 2200Z on 30 Sep 2011IA. Analysis of Solar Active Regions and Activity from 29-2100Z to 30-2100Z Solar activity was moderate. Region 1305 (N12E01)
produced an M1/1f at 30/1906Z. A Type II Radio Sweep (estimated
speed 690 km/s) was associated with this event along with a 260 sfu
tenflare. Region 1305 has shown slight aerial and penumbral growth
and maintains a beta-gamma magnetic configuration. Region 1302
(N13W29) produced a C1/Sf at 30/0252Z and has a beta-gamma-delta
magnetic configuration. Region 1307 (N14E48) has grown slightly and
produced a C3 at 30/1847Z.
IB. Solar Activity Forecast
Solar activity is expected to be low
with M-class activity likely through the period (01-03 October),
mainly from Regions 1302 and 1305. There is a slight chance for
X-class activity from these regions as well.
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
The geomagnetic field was quiet during the past 24 hours. 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 be quiet to unsettled with a slight chance for isolated
active periods on days one and two (01-02 October). The increase in
activity is expected due to the anticipated arrival of a recurrent
coronal hole high speed stream (CH HSS) on day one and possible
effects on day two from a weak CME associated with the long duration
C2 event observed on 29 September. Mostly quiet conditions are
expected on day three (03 October).
III. Event Probabilities 01 Oct to 03 Oct
| Class M | 60% | 60% | 60% |
| Class X | 20% | 20% | 20% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 30 Sep 138 Predicted 01 Oct-03 Oct 140/140/140 90 Day Mean 30 Sep 110
V. Geomagnetic A Indices
Observed Afr/Ap 29 Sep 016/015 Estimated Afr/Ap 30 Sep 005/005 Predicted Afr/Ap 01 Oct-03 Oct 008/010-008/008-005/005
VI. Geomagnetic Activity Probabilities 01 Oct to 03 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 05% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 05% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
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