Viewing archive of Friday, 24 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 24 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 205 Issued at 2200Z on 24 JUL 1998IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z SOLAR ACTIVITY REMAINED AT LOW LEVELS. ISOLATED C-CLASS
SUBFLARES OCCURRED, THE LARGEST OF WHICH WAS A C8/SF FROM REGION
8280 (S23E40) AT 24/0338UT. REGION 8280 REMAINED THE LARGEST GROUP
ON THE DISK AND RETAINED A SIMPLE BIPOLAR MAGNETIC STRUCTURE. REGION
8282 (N32E43) GREW AT A MODERATE PACE AND PRODUCED ISOLATED
SUBFLARES. NO NEW REGIONS WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
PREDOMINATELY LOW WITH A FAIR CHANCE FOR AN ISOLATED M-CLASS FLARE
FROM EITHER REGION 8280 OR 8282.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
THE GEOMAGNETIC FIELD WAS AT UNSETTLED TO MINOR STORM LEVELS WITH
ISOLATED MAJOR STORM PERIODS OBSERVED AT HIGH LATITUDES. ACE
NEAR-REAL-TIME SOLAR WIND DATA INDICATED THE ACTIVITY WAS DUE TO A
HIGH SPEED STREAM ASSOCIATED WITH AN EXTENSION OF THE NORTHERN POLAR
CORONAL HOLE. THE GREATER THAN 2 MEV ELECTRON FLUX REACHED HIGH
LEVELS AT 23/2240UT, THEN VARIED FROM MODERATE TO HIGH LEVELS FOR
THE REST OF THE PERIOD.
IIB. Geophysical Activity Forecast
THE CORONAL HOLE-RELATED
DISTURBANCE IS EXPECTED TO SUBSIDE TO QUIET TO ACTIVE LEVELS
TOMORROW. QUIET TO UNSETTLED CONDITIONS ARE EXPECTED FOR THE
REMAINDER OF THE PERIOD. THE GREATER THAN 2 MEV ELECTRON FLUX IS
EXPECTED TO REMAIN AT MODERATE TO HIGH LEVELS FOR MOST OF THE
PERIOD.
III. Event Probabilities 25 JUL to 27 JUL
| Class M | 25% | 25% | 25% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 24 JUL 125 Predicted 25 JUL-27 JUL 128/130/132 90 Day Mean 24 JUL 108
V. Geomagnetic A Indices
OBSERVED AFR/AP 23 JUL 025/037 ESTIMATED AFR/AP 24 JUL 022/022 PREDICTED AFR/AP 25 JUL-27 JUL 012/015-010/010-007/007
VI. Geomagnetic Activity Probabilities 25 JUL to 27 JUL
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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