Viewing archive of Wednesday, 20 October 2010
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 2010 Oct 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 293 Issued at 2200Z on 20 Oct 2010IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity was at low levels. Region 1112 (S20W84)
produced the lone event of the period, a C1.5/Sf at 20/1150Z. The
remaining regions were quiet and unchanged.
IB. Solar Activity Forecast
Solar activity is expected to be
predominately very low all three days of the forecast period (21 -
23 October). A chance for an isolated C-class event exists on day
one (21 October) from departing Region 1112, decaying to a slight
chance of C-class activity on days two and three (22 - 23 October).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic field was quiet. Solar wind velocities remained
steady during the period, varying between 420 - 460 km/s while the
Bz component of the interplanetary magnetic field remained
predominately north.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet to unsettled levels, with isolated active
periods on day one (21 October). A small, recurrent coronal hole
high speed stream (CH HSS) is expected to rotate into a geoeffective
position on 21 October. By day two (22 October), field conditions
are expected to be mostly quiet. Late on day three (23 October), a
large, recurrent CH HSS is expected to become geoeffective,
resulting in quiet to active conditions.
III. Event Probabilities 21 Oct to 23 Oct
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Oct 084 Predicted 21 Oct-23 Oct 084/083/082 90 Day Mean 20 Oct 081
V. Geomagnetic A Indices
Observed Afr/Ap 19 Oct 007/005 Estimated Afr/Ap 20 Oct 004/005 Predicted Afr/Ap 21 Oct-23 Oct 008/008-005/005-008/010
VI. Geomagnetic Activity Probabilities 21 Oct to 23 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 05% | 20% |
| Minor storm | 05% | 01% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 10% | 25% |
| Minor storm | 10% | 01% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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