Viewing archive of Wednesday, 18 August 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 Aug 18 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 230 Issued at 2200Z on 18 Aug 2010IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity was low. Region 1099 (N17W110) produced
two C-class flares during the period. The largest of these was a
long-duration C4 flare at 18/0548Z, with an associated Type-II radio
sweep with an estimated velocity of 545 km/s. SOHO C3 imagery
observed a partial-halo CME at 18/0600Z. This CME is not expected to
be Earth-directed. No new regions were numbered.
IB. Solar Activity Forecast
Solar activity is expected to be very
low, with a slight chance for a C-class flare.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic field was predominantly quiet, with an unsettled
period observed at 18/0600Z. An enhancement of the greater than 10
MeV proton flux at geosynchronous orbit began at around 18/0800Z and
was associated with the long-duration C4 flare at 18/0548Z. The
enhancement peaked around mid-period, then gradually decreased.
Todays Penticton 10.7 cm Flux value was estimated.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be predominantly quiet for the next three days (19-21
August).
III. Event Probabilities 19 Aug to 21 Aug
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Aug 081 Predicted 19 Aug-21 Aug 081/080/080 90 Day Mean 18 Aug 077
V. Geomagnetic A Indices
Observed Afr/Ap 17 Aug 003/005 Estimated Afr/Ap 18 Aug 004/005 Predicted Afr/Ap 19 Aug-21 Aug 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 19 Aug to 21 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
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