Viewing archive of Saturday, 25 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 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 206 Issued at 2200Z on 25 JUL 1998IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z SOLAR ACTIVITY CONTINUED AT LOW LEVELS. TWO C-CLASS
FLARES OCCURRED, ONE OF WHICH WAS OPTICALLY TIED TO REGION 8280
(S23E27). THIS REGION REMAINED A MODERATELY LARGE, STABLE H-TYPE.
REGION 8282 (N31E31) STABILIZED EARLY IN THE PERIOD FOLLOWING A DAY
OF MODERATE GROWTH. THERE WERE SOME SIGNS OF MAGNETIC COMPLEXITY
WITHIN THE REGION WITH A WEAK DELTA MAGNETIC CONFIGURATION REPORTED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
PREDOMINATELY LOW WITH A FAIR CHANCE FOR AN ISOLATED M-CLASS FLARE
FROM REGION 8280 OR 8282.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED UNTIL 25/0500UT.
ACTIVITY INCREASED DURING 25/0500 - 0900UT WITH ACTIVE LEVELS AT
MIDDLE LATITUDES AND ACTIVE TO MAJOR STORM LEVELS AT HIGH LATITUDES.
THE GEOMAGNETIC FIELD RETURNED TO QUIET TO UNSETTLED LEVELS AFTER
25/0900UT. THE GREATER THAN 2 MEV ELECTRON FLUX WAS AT HIGH LEVELS
DURING MOST OF THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY QUIET TO UNSETTLED. THE GREATER THAN 2 MEV
ELECTRON FLUX IS EXPECTED TO BE AT MODERATE TO HIGH LEVELS.
III. Event Probabilities 26 JUL to 28 JUL
| Class M | 30% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 JUL 122 Predicted 26 JUL-28 JUL 124/126/128 90 Day Mean 25 JUL 109
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 JUL 018/022 ESTIMATED AFR/AP 25 JUL 014/012 PREDICTED AFR/AP 26 JUL-28 JUL 010/007-007/007-007/010
VI. Geomagnetic Activity Probabilities 26 JUL to 28 JUL
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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