Viewing archive of Friday, 26 June 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 Jun 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 177 Issued at 2200Z on 26 JUN 1998IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z SOLAR ACTIVITY WAS LOW. A C6/SF AT 25/2107Z FROM REGION
8253 (N17E26) WAS THE HIGHLIGHT OF AN OTHERWISE QUIET DAY. TWO NEW
REGIONS WERE NUMBERED, 8257 (N29W19) AND 8258 (S14E64), MAKING A
TOTAL OF SIX SPOTTED REGIONS ON THE DISK.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS AT MAJOR TO SEVERE STORM LEVELS DURING THE
PAST 24 HOURS. A CORONAL MASS EJECTION WAS SEEN TO PASS THE ACE
SPACECRAFT BEGINNING AT APPROXIMATELY 25/1600Z. THE LATTER HALF OF
THE EVENT EXHIBITED STRONG, PROLONGED, SOUTHWARD MAGNETIC FIELDS
FROM 25/2200Z TO 26/0600Z. THE SOLAR SOURCE OF THIS EJECTA IS LIKELY
EITHER FROM ACTIVITY OCCURRING ON JUNE 20, OR JUNE 22. THE
DISTURBANCE WEAKENEND DURING THE SECOND HALF OF THE PERIOD, GIVING
WAY TO QUIET TO UNSETTLED CONDITIONS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE PRIMARILY UNSETTLED, WITH PERIODS OF ACTIVE
CONDITIONS POSSIBLE DURING LOCAL NIGHTTIMES, FOR THE NEXT 24 HOURS.
QUIET TO UNSETTLED CONDITIONS SHOULD PREVAIL BY THE END OF THE
INTERVAL.
III. Event Probabilities 27 JUN to 29 JUN
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 26 JUN 109 Predicted 27 JUN-29 JUN 110/115/115 90 Day Mean 26 JUN 107
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 JUN 010/010 ESTIMATED AFR/AP 26 JUN 035/045 PREDICTED AFR/AP 27 JUN-29 JUN 015/015-005/008-005/008
VI. Geomagnetic Activity Probabilities 27 JUN to 29 JUN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 10% | 10% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 25% | 20% |
| Minor storm | 20% | 10% | 05% |
| Major-severe storm | 05% | 01% | 01% |
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