Viewing archive of Thursday, 16 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 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 197 Issued at 2200Z on 16 JUL 1998IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z SOLAR ACTIVITY HAS BEEN LOW. NEW REGION 8275 (N16E64)
WAS NUMBERED TODAY. SEVERAL SUNSPOT GROUPS CONTRIBUTE TO THE NEAR
C-CLASS BACKGROUND AND HAVE THE POSSIBILITY TO GENERATE LOW M-CLASS
ACTIVITY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW WITH THE POSSIBILITY OF M-CLASS ACTIVITY FROM REGIONS 8273 AND
8274.
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
THE GEOMAGNETIC FIELD RANGED FROM UNSETTLED CONDITIONS TO MINOR STORM
CONDITIONS. THE CAUSE OF THIS ACTIVITY APPEARS TO BE A
GEO-EFFECTIVELY POSITIONED CORONAL HOLE. SOLAR WIND SPEEDS ROSE
FROM 300 KM/S NEAR THE START OF THE UT DAY TO NEARLY 700 KM/S FROM
06-1400 UT.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD BE
QUIET TO UNSETTLED WITH ISOLATED ACTIVE PERIODS.
III. Event Probabilities 17 JUL to 19 JUL
| Class M | 20% | 20% | 20% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 16 JUL 106 Predicted 17 JUL-19 JUL 106/107/108 90 Day Mean 16 JUL 107
V. Geomagnetic A Indices
OBSERVED AFR/AP 15 JUL 002/005 ESTIMATED AFR/AP 16 JUL 025/040 PREDICTED AFR/AP 17 JUL-19 JUL 015/018-012/012-010/012
VI. Geomagnetic Activity Probabilities 17 JUL to 19 JUL
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 20% | 15% | 10% |
| Major-severe storm | 05% | 05% | 05% |
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