Viewing archive of Sunday, 19 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 19 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 19 Aug 2012IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity was moderate. Region 1548 (N19E62)
produced two M-class flares, an M1/Sf at 18/2254Z and an M1/Sn flare
at 18/2322Z. Activity then decreased to low levels for the
remainder of the period. Region 1548 decreased in area and ended
the period as a Cso type group with beta magnetic characteristics.
New Region 1549 (S16W30) was numbered today and also a simple
Cso-beta type group.
IB. Solar Activity Forecast
Solar activity is expected to be low
with a chance for an M-class event for the next three days (20-22
August).
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic field ranged from quiet to unsettled levels. A
coronal hole high speed stream became geoeffective during the past
24 hours. At approximately 18/08Z, solar wind speed at the ACE
spacecraft began increasing from about 400 km/s to 580 km/s.
Shortly after, the Bz component of the interplanetary magnetic field
(IMF) became negative, eventually reaching -12nT. Bz returned to
positive values around 14Z. Earth is currently in the positive
sector of the IMF.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at mostly unsettled levels with a chance for active
conditions on day 1 (20 August), decreasing to a slight chance on
days 2-3 (21-22 August). The disturbed conditions are expected in
response to the continued presence of the coronal hole high speed
stream.
III. Event Probabilities 20 Aug to 22 Aug
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Aug 096 Predicted 20 Aug-22 Aug 100/100/105 90 Day Mean 19 Aug 125
V. Geomagnetic A Indices
Observed Afr/Ap 18 Aug 011/013 Estimated Afr/Ap 19 Aug 010/013 Predicted Afr/Ap 20 Aug-22 Aug 012/012-007/008-007/008
VI. Geomagnetic Activity Probabilities 20 Aug to 22 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 30% | 20% | 20% |
| Major-severe storm | 25% | 15% | 20% |
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