Viewing archive of Sunday, 12 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 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 225 Issued at 2200Z on 12 Aug 2012IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z Solar activity was very low. Region 1542 (S13W04)
produced a B8/Sf at 12/1344Z, and several other Sf optical flares
throughout the period. Region 1543 (N20E07) remained the largest
region on the disk. Both Regions 1542 and 1543 ended the period
with beta-gamma magnetic configurations.
IB. Solar Activity Forecast
Solar activity is expected to be low
with a slight chance for an M-class event.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
The geomagnetic field was quiet. A solar sector boundary change,
from positive to negative occurred at approximately 12/1330Z. Wind
speed at the ACE spacecraft rose from approximatly 300 km/s at the
beginning of the period to end near 400 km/s. The Bz component of
the interplanetary magnetic field was slightly negative from 11/21Z
to 12/06Z, then ranged from +/- 5nT for the remainder of the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled, with a slight chance for an
active period, for days 1 and 2 (13-14 August) before becoming
mostly quiet on day 3 (15 August). The increased activity on the
first two days is expected from the influence of a weak high speed
stream.
III. Event Probabilities 13 Aug to 15 Aug
| Class M | 15% | 10% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 12 Aug 112 Predicted 13 Aug-15 Aug 115/110/100 90 Day Mean 12 Aug 127
V. Geomagnetic A Indices
Observed Afr/Ap 11 Aug 005/004 Estimated Afr/Ap 12 Aug 006/007 Predicted Afr/Ap 13 Aug-15 Aug 008/008-009/008-006/005
VI. Geomagnetic Activity Probabilities 13 Aug to 15 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 15% | 10% | 05% |
All times in UTC
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