Viewing archive of Monday, 15 August 2011
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 2011 Aug 16 0405 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
:::::::::: CORRECTED COPY :::::::::: SDF Number 227 Issued at 2200Z on 15 Aug 2011IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z Solar activity has been low. Newly assigned Region
1271 (N17E74) produced a C1 flare at 15/0454Z. A C3 flare at
15/1120Z originated from a region on the southeast limb, not yet on
the disk. Both regions produced several B-class flares.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low with C-class events likely.
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
The geomagnetic field was quiet to active during the past 24 hours
with a brief minor storm period at Boulder from 15/0000 - 0300Z,
under the continued influence of a coronal hole high speed stream.
ACE solar wind data indicated velocities up to 560 km/s, density up
to 9 p/cc, and the southward component of the IMF (Bz) down to -9
nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled with a chance for active
conditions on days 1 and 2 (16-17 Aug). Day 3 (18 Aug) is expected
to return to quiet levels as effects from the coronal hole high
speed stream begin to wane.
III. Event Probabilities 16 Aug to 18 Aug
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 15 Aug 090 Predicted 16 Aug-18 Aug 095/095/095 90 Day Mean 15 Aug 096
V. Geomagnetic A Indices
Observed Afr/Ap 14 Aug 008/009 Estimated Afr/Ap 15 Aug 010/015 Predicted Afr/Ap 16 Aug-18 Aug 010/010-008/010-005/005
VI. Geomagnetic Activity Probabilities 16 Aug to 18 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 15% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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