Viewing archive of Thursday, 24 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 24 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.comJoint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 175 Issued at 2200Z on 24 JUN 1999
IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z
SOLAR ACTIVITY WAS MODERATE. THE LARGEST X-RAY FLARE
WAS AN OPTICALLY UNCORRELATED M1 EVENT AT 23/2316Z. THE BACKGROUND
X-RAY FLUX REMAINED ABOVE C-LEVEL THRESHOLDS FOR NEARLY THE ENTIRE
PERIOD WITH FREQUENT IMBEDDED C-CLASS FLARES. OVER TWENTY OPTICAL
FLARES WERE REPORTED, NEARLY ALL OF THEM FROM THE EXTENSIVE CLUSTER
OF GROUPS IN THE NE QUADRANT. TWO DISAPPEARING FILAMENTS WERE SEEN.
THE FIRST OCCURRED AT APPROXIMATELY 24/1200Z; IT ORIGINATED NEAR
REGION 8595 (N23W21) AND WAS ACCOMPANIED BY A CLASSIC HYDER TYPE
FLARE AND NEARLY THREE HOURS OF ENHANCED X-RAY FLUX LEVELS. THE
SECOND FILAMENT DISAPPEARED AT APPROXIMATELY 24/1830Z FROM AN AREA
NEAR REGION 8598 (N23E28). IT WAS ACCOMPANIED BY OPTICAL FLARES
NEAR THE FILAMENT FOOTPOINTS AND APPROXIMATELY NINETY MINUTES OF
ENHANCED X-RAY FLUX. THREE NEW REGIONS WERE NUMBERED TODAY; THEY
ARE REGIONS 8604 (N12W54), 8605 (S22W32), AND 8606 (N17E33).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. CONSIDERABLE ACTIVITY AND MAGNETIC COMPLEXITY
CURRENTLY SEEN IN THE NE GROUP CLUSTER INCREASES THE PROBABILITY OF
STRONG FLARE ACTIVITY OVER THE NEXT SEVERAL DAYS.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
THE GEOMAGNETIC FIELD HAS BEEN MOSTLY QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE WITH A CHANCE FOR MINOR STORMING
THROUGHOUT THE FORECAST PERIOD. FLARE ASSOCIATED CMES, WHICH
OCCURRED ON 22/1829Z AND 23/0709Z, ARE EXPECTED TO ARRIVE OVER THE
FIRST TWO DAYS. TODAY'S EARLY DISAPPEARING FILAMENT SHOULD ARRIVE
LATE ON THE THIRD DAY.
III. Event Probabilities 25 JUN to 27 JUN
Class M | 60% | 60% | 60% |
Class X | 05% | 05% | 05% |
Proton | 20% | 20% | 20% |
PCAF | GREEN
|
IV. Penticton 10.7 cm Flux
Observed 24 JUN 185
Predicted 25 JUN-27 JUN 180/185/190
90 Day Mean 24 JUN 139
V. Geomagnetic A Indices
OBSERVED AFR/AP 23 JUN 005/006
ESTIMATED AFR/AP 24 JUN 007/006
PREDICTED AFR/AP 25 JUN-27 JUN 015/015-015/015-015/015
VI. Geomagnetic Activity Probabilities 25 JUN to 27 JUN
A. Middle Latitudes |
Active | 35% | 35% | 40% |
Minor storm | 15% | 15% | 20% |
Major-severe storm | 01% | 01% | 05% |
B. High Latitudes |
Active | 40% | 40% | 50% |
Minor storm | 20% | 20% | 25% |
Major-severe storm | 01% | 01% | 10% |
All times in UTC
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