Viewing archive of Friday, 25 June 1999
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 1999 Jun 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 176 Issued at 2200Z on 25 JUN 1999IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z SOLAR ACTIVITY WAS LOW. THE LARGEST EVENT OF THE PERIOD
WAS A C3.4 AT 24/2305Z FROM REGION 8603 (S15E54). REGION 8603 WAS
OTHERWISE QUIET DURING THE PAST 24 HOURS. REGION 8598 (N23E13) IS
THE DOMINANT REGION ON THE DISK AND PRODUCED THE MAJORITY OF TODAY'S
FREQUENT SUBFLARE ACTIVITY. THE SUNSPOT AREA IN THIS REGION HAS
CONTINUED TO INCREASE. THE REGION'S MAGNETIC CONFIGURATION IS NOT
UNDULY COMPLEX AT THIS TIME. REGION 8604 (N12W68) ALSO PRODUCED A
FEW SUBFLARES TODAY. YESTERDAY'S FILAMENT ERUPTION THAT OCCURRED AT
ABOUT 24/1200Z WAS ASSOCIATED WITH THE OBSERVATION OF A PARTIAL HALO
CME BY LASCO.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE, BUT THERE IS A SLIGHT CHANCE FOR HIGH ACTIVITY LEVELS.
REGION 8598 IS CONSIDERED TO BE THE MOST LIKELY SOURCE FOR ENERGETIC
FLARES, ESPECIALLY IF SOME MAGNETIC COMPLEXITY DEVELOPS. REGIONS
8603, 8604, AND 8606 MAY ALSO CONTRIBUTE SOME C-CLASS SUBFLARES TO
SOLAR ACTIVITY.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD HAS BEEN MOSTLY QUIET FOR THE PAST 24 HOURS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT THREE DAYS.
YESTERDAY'S PARTIAL HALO CME MAY ENHANCE ACTIVITY SOME, BEGINNING
LATE ON THE THRID DAY, ALTHOUGH OBSERVATIONS SUGGEST THAT THE
TRANSIENT IS NOT MOVING DIRECTLY AT THE EARTH.
III. Event Probabilities 26 JUN to 28 JUN
| Class M | 55% | 55% | 55% |
| Class X | 15% | 15% | 15% |
| Proton | 20% | 20% | 20% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 JUN 201 Predicted 26 JUN-28 JUN 205/210/210 90 Day Mean 25 JUN 140
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 JUN 004/006 ESTIMATED AFR/AP 25 JUN 005/008 PREDICTED AFR/AP 26 JUN-28 JUN 005/010-005/012-010/012
VI. Geomagnetic Activity Probabilities 26 JUN to 28 JUN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
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