Viewing archive of Saturday, 10 July 1999
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 1999 Jul 10 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 191 Issued at 2200Z on 10 JUL 1999IA. Analysis of Solar Active Regions and Activity from 09-2100Z to 10-2100Z
SOLAR ACTIVITY WAS LOW. REGION 8629 (N23W84) PRODUCED
THE LARGEST FLARE OF THE PAST DAY, A C6/SF AT 09/2239UT. GROWTH IN
THIS ACTIVE REGION SEEMS TO BE SLOWING; HOWEVER, LIMB PROXIMITY
MAKES ANALYSIS UNCERTAIN. REGIONS 8615 (S31W40) AND 8627 (S12E47)
ALSO PRODUCED C-LEVEL FLARES. NONE OF THE REGIONS APPEAR
SIGNIFICANTLY COMPLEX.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
C-CLASS ACTIVITY IS PROBABLE IN REGIONS 8615, 8627, AND 8629. AN
ISOLATED M-CLASS FLARE IS POSSIBLE IN REGION 8629 BEFORE IT EXITS
THE VISIBLE DISK.
IIA. Geophysical Activity Summary 09-2100Z to 10-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET.
III. Event Probabilities 11 JUL to 13 JUL
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 10 JUL 156 Predicted 11 JUL-13 JUL 158/158/156 90 Day Mean 10 JUL 151
V. Geomagnetic A Indices
OBSERVED AFR/AP 09 JUL 005/006 ESTIMATED AFR/AP 10 JUL 004/005 PREDICTED AFR/AP 11 JUL-13 JUL 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 11 JUL to 13 JUL
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future
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