Viewing archive of Tuesday, 13 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 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 194 Issued at 2200Z on 13 JUL 1999IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z SOLAR ACTIVITY WAS LOW. THE LARGEST EVENT WAS AN
OPTICALLY UNCORRELATED C2.9 AT 13/0546UT. THERE ARE 12 SPOTTED
REGIONS ON THE DISK, MOST ARE LOCATED IN THE WESTERN HEMISPHERE, ALL
APPEAR STABLE OR DECLINING. THE FILAMENT LOCATED NEAR N40E60 AND
EXTENDING TO THE NORTHEAST LIMB DISAPPEARED BETWEEN 13/0800UT AND
13/1800UT. THIS EVENT WAS PROBABLY THE SOURCE OF THE CME OBSERVED
BY THE SOHO SPACECRAFT AROUND 13/1200UT.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
THE GEOMAGNETIC FIELD HAS BEEN GENERALLY QUIET FOR THE PAST 24 HOURS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED EARLY IN THE PERIOD. THERE IS A
FAIR CHANCE FOR ACTIVE CONDITIONS LATE IN THE PERIOD AS A RESULT OF
RECENT SOLAR EVENTS.
III. Event Probabilities 14 JUL to 16 JUL
| Class M | 25% | 20% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 13 JUL 144 Predicted 14 JUL-16 JUL 142/140/135 90 Day Mean 13 JUL 152
V. Geomagnetic A Indices
OBSERVED AFR/AP 12 JUL 012/014 ESTIMATED AFR/AP 13 JUL 004/008 PREDICTED AFR/AP 14 JUL-16 JUL 005/005-005/005-007/006
VI. Geomagnetic Activity Probabilities 14 JUL to 16 JUL
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 20% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
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