Viewing archive of Wednesday, 21 November 2001
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 2001 Nov 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 325 Issued at 2200Z on 21 Nov 2001 **********CORRECTED COPY**********IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity has been low. Region 9704 (S17W24) was
the sole source of all the optical activity, and remains the largest
and most magnetically complex region on the visible disk. The
largest event of the period was a C6/Sf at 21/1818 UTC. A more
significant, long duration C4/Sf occurred during 21/1207-1650 UTC,
with peak flux observed at 21/1458 UTC. This event was accompanied
by a Type-IV radio sweep, and an associated filament eruption at
approximately N35W10. By 21/1406 UTC, a full halo CME was evident
in SOHO/LASCO imagery. New Region 9712 (N13E71) was numbered today
as it rotated into view on the east limb.
IB. Solar Activity Forecast
Solar activity is expected to be low
to moderate.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic field was quiet to unsettled.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled through 23 November. A shock
arrival is expected early on 24 November, in association with the
CME activity described in section 1A above. Geomagnetic field
activity is expected to increase on that date, with isolated minor
storm periods possible.
III. Event Probabilities 22 Nov to 24 Nov
| Class M | 35% | 35% | 35% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Nov 184 Predicted 22 Nov-24 Nov 175/175/170 90 Day Mean 21 Nov 218
V. Geomagnetic A Indices
Observed Afr/Ap 20 Nov 008/008 Estimated Afr/Ap 21 Nov 006/008 Predicted Afr/Ap 22 Nov-24 Nov 008/008-010/010-018/020
VI. Geomagnetic Activity Probabilities 22 Nov to 24 Nov
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 25% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 35% |
| Minor storm | 05% | 10% | 15% |
| Major-severe storm | 01% | 01% | 10% |
All times in UTC
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