Viewing archive of Wednesday, 26 October 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 Oct 26 2205 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 299 Issued at 2200Z on 26 Oct 2011IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity was at low levels due to a single C1
x-ray event at 26/1001Z from Region 1324 (N12W38). Associated with
this event was a partial-halo CME, first observed in LASCO C2
imagery lifting off the NW limb at 26/1000Z. GOES-15 SXI imagery
first observed material movement from Region 1324 in a W-NW
direction at about 26/0800Z. Limited imagery prevented a thorough
analysis of the CMEs potential geoeffectiveness. The region
exhibited significant decay in area and spot count and was
classified as a beta magnetic configuration. Regions 1325 (N17W12)
and 1327 (S20W67) also indicated decay in both area coverage and
spot count. The remaining regions were unchanged.
IB. Solar Activity Forecast
Solar activity is expected to be low
with a slight chance for M-class activity all three days (27 - 29
October).
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic field was quiet at all latitudes. Solar wind speeds
decayed through the period from near 550 km/s to about 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 quiet on day one (27 October). Quiet to unsettled
conditions are expected on days two and three (28 - 29 October) as a
recurrent coronal hole high speed stream rotates into a geoeffective
position.
III. Event Probabilities 27 Oct to 29 Oct
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Oct 132 Predicted 27 Oct-29 Oct 130/130/130 90 Day Mean 26 Oct 124
V. Geomagnetic A Indices
Observed Afr/Ap 25 Oct 027/033 Estimated Afr/Ap 26 Oct 003/005 Predicted Afr/Ap 27 Oct-29 Oct 005/005-007/007-007/008
VI. Geomagnetic Activity Probabilities 27 Oct to 29 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 20% |
| Minor storm | 05% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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