Viewing archive of Sunday, 20 August 2006
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 2006 Aug 20 2221 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 2006IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity was low. Region 904 (S14W72) produced
multiple B-class and C-class flares including a C2.9 flare at
20/1632Z. This region also produced a long duration C-class flare
with maximum occurring at 20/1346Z, An associated CME was observed
on the southwest limb in LASCO imagery at 20/1442Z. The
plane-of-sky speed was estimated to be 300 km/s.
IB. Solar Activity Forecast
Solar activity is expected to be low
with the possibility of an isolated M-class flare from Region 904.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic field has been at quiet to major storm levels. There
was a period of severe storm levels from 1200 - 1800Z recorded on
the College, AK magnetometer. This activity is likely due to the
full halo CME observed on 16 August.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled for the forecast period, 21 - 23
August. Due to the relatively slow speed of the CME mentioned
above, no effects are anticipated during this forecast period.
III. Event Probabilities 21 Aug to 23 Aug
| Class M | 10% | 10% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Aug 088 Predicted 21 Aug-23 Aug 090/090/085 90 Day Mean 20 Aug 077
V. Geomagnetic A Indices
Observed Afr/Ap 19 Aug 021/038 Estimated Afr/Ap 20 Aug 022/025 Predicted Afr/Ap 21 Aug-23 Aug 008/012-006/005-006/005
VI. Geomagnetic Activity Probabilities 21 Aug to 23 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 30% |
| Minor storm | 20% | 15% | 15% |
| Major-severe storm | 05% | 01% | 01% |
All times in UTC
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