Viewing archive of Monday, 20 August 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 Aug 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 232 Issued at 2200Z on 20 Aug 2001IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity was low. Both Regions 9582 (N28E05) and
9585 (N15E22) produced C-class subflares. The most interesting
activity was an eruptive prominence on the limb (EPL) near southeast
20 at about 20/1920 UTC. The event was accompanied by a
long-duration C2 x-ray burst, a type II sweep, and other radio
output that included 120 sfu at 2695 Mhz and 8100 sfu at 245 Mhz.
New Regions 9589 (N15W21) and 9590 (S28E80) were numbered.
IB. Solar Activity Forecast
Solar activity is expected to be low.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic field was quiet to unsettled.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled.
III. Event Probabilities 21 Aug to 23 Aug
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Aug 156 Predicted 21 Aug-23 Aug 155/155/155 90 Day Mean 20 Aug 152
V. Geomagnetic A Indices
Observed Afr/Ap 19 Aug 008/012 Estimated Afr/Ap 20 Aug 008/011 Predicted Afr/Ap 21 Aug-23 Aug 010/010-010/008-005/008
VI. Geomagnetic Activity Probabilities 21 Aug to 23 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 15% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
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