Viewing archive of Friday, 17 August 2012
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 2012 Aug 17 2200 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 17 Aug 2012IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity was moderate. An M2 flare was observed
on the northeast limb at 17/1319Z. A coronal mass ejection (CME)
was later observed in LASCO C3 imagery emerging from the northeast
limb around 17/1354Z. An M1 flare followed at 17/1720Z from the
same vicinity. The M1 flare was accompanied by a Tenflare (140sfu).
New region 1547 (N05E21) was numbered today and classified as a Cso
type group with beta magnetic characteristics. Region 1543 (N24W59)
remained the largest group on the disk and was classified as a Cko
type group with beta magnetic characteristics.
IB. Solar Activity Forecast
Solar activity is expected to be low,
with a slight chance for an M-flare.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic field ranged from quiet to active levels. Active
levels were observed during the 00-03Z synoptic period. The
remainder of the day saw quiet to active conditions. The active
period was associated with effects from a CME which occurred on 13
August.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled for the next three days (18-20
August) with lingering effects from a CME and the arrival of a
coronal hole high speed stream.
III. Event Probabilities 18 Aug to 20 Aug
| Class M | 10% | 15% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Aug 095 Predicted 18 Aug-20 Aug 095/095/100 90 Day Mean 17 Aug 126
V. Geomagnetic A Indices
Observed Afr/Ap 16 Aug 010/012 Estimated Afr/Ap 17 Aug 011/013 Predicted Afr/Ap 18 Aug-20 Aug 009/012-010/012-011/012
VI. Geomagnetic Activity Probabilities 18 Aug to 20 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 20% |
| Minor storm | 15% | 30% | 30% |
| Major-severe storm | 05% | 25% | 25% |
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