Viewing archive of Thursday, 23 July 2009
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 2009 Jul 23 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 204 Issued at 2200Z on 23 Jul 2009IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z Solar activity has been very low. The STEREO
spacecraft observed a CME off of the east limb of the sun around
23/0624Z. Further analysis shows this to be from old Region 1024
(S26, L248) which is due to return to the disk on 25 July.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
The geomagnetic field was quiet to unsettled. Observations from the
ACE spacecraft indicate the earth continues under the influence of
the coronal hole high speed stream. Solar wind velocities are
averaging around 550 km/s with Bz fluctuations of +/- 5 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at mostly quiet conditions for days one and two
(24-25 July). Quiet to unsettled levels are expected for day three
(26 July) due to the return of a recurrent high speed stream.
III. Event Probabilities 24 Jul to 26 Jul
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 23 Jul 068 Predicted 24 Jul-26 Jul 068/069/070 90 Day Mean 23 Jul 069
V. Geomagnetic A Indices
Observed Afr/Ap 22 Jul 018/024 Estimated Afr/Ap 23 Jul 006/008 Predicted Afr/Ap 24 Jul-26 Jul 005/005-005/005-007/008
VI. Geomagnetic Activity Probabilities 24 Jul to 26 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 15% |
| Minor storm | 01% | 01% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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