Viewing archive of Friday, 17 July 1998
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 1998 Jul 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 198 Issued at 2200Z on 17 JUL 1998IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z
SOLAR ACTIVITY HAS BEEN VERY LOW. THERE HAS BEEN
SIGNIFICANT GROWTH AND DECAY IN SEVERAL REGIONS OVER THE LAST 24
HOURS. TWO OR THREE SMALL DSFS HAVE TAKEN OFF AS WELL.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW TO LOW. SEVERAL REGIONS ON THE DISK HAVE THE POTENTIAL TO
GENERATE C-CLASS X-RAY EVENTS.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. ENERGETIC ELECTRONS
ROSE TO HIGH LEVELS AFTER 1400Z TODAY. THE SOLAR WIND SPEEDS
DECLINED TO NORMAL LEVELS AND DENSITIES HAVE INCREASED SLIGHTLY,
INDICATING A DECREASE IN CORONAL HOLE EFFECTS FROM YESTERDAY.
IIB. Geophysical Activity Forecast
GEOMAGNETIC ACTIVITY IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE REST OF THE PERIOD. A
RETURNING CORONAL EXTENSION WILL BE ROTATING BACK ON TO THE SOLAR
DISK IN THE NEXT SEVERAL DAYS.
III. Event Probabilities 18 JUL to 20 JUL
| Class M | 15% | 15% | 15% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 17 JUL 100 Predicted 18 JUL-20 JUL 100/102/104 90 Day Mean 17 JUL 107
V. Geomagnetic A Indices
OBSERVED AFR/AP 16 JUL 024/037 ESTIMATED AFR/AP 17 JUL 010/011 PREDICTED AFR/AP 18 JUL-20 JUL 010/010-007/010-007/007
VI. Geomagnetic Activity Probabilities 18 JUL to 20 JUL
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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