Viewing archive of Wednesday, 23 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 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 174 Issued at 2200Z on 23 JUN 1999IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z
SOLAR ACTIVITY WAS MODERATE. THE LARGEST EVENT WAS AN
M1/2N FLARE AT 23/0709Z FROM REGION 8598 (N23E43). THIS FLARE WAS
ACCOMPANIED BY A TYPE IV RADIO SWEEP AS WELL AS MULTI-FREQUENCY
RADIO BURSTS. AT 23/0047Z A C7/1F FLARE OCCURRED, ORIGINATING FROM
UNSPOTTED REGION 8583 (S11W90). THROUGHOUT THE PERIOD BACKGROUND
X-RAY FLUX LEVELS HOVERED AT OR NEAR C LEVELS WITH FREQUENT SMALL
C-CLASS EVENTS. REGION 8598, WHICH LIES WITHIN A LARGE CLUSTER OF
REGIONS IN THE NORTHEAST QUADRANT OF THE DISK, IS THE LARGEST AND
MOST MAGNETICALLY COMPLICATED SPOT GROUP ON THE DISK. REGIONS 8601
(S15W36), 8602 (N19E75), 8603 (S16E75) WERE NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. GROWTH AND MAGNETIC INTERACTION WITHIN THE LARGE
NORTHEAST CLUSTER OF REGIONS INCREASES THE CHANCES OF M-CLASS FLARES
OVER THE NEXT SEVERAL DAYS.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
THE GEOMAGNETIC FIELD WAS QUIET THROUGHOUT THE PERIOD. RECENT
ANALYSIS OF SOHO IMAGERY INDICATED THE PRESENCE OF A HALO CME
ASSOCIATED WITH THE M1/1N FLARE ON 22/1829Z AND THE POSSIBILITY OF
ANOTHER GEOEFFECTIVE CME WITH TODAY'S M1 FLARE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET ON THE FIRST DAY OF THE FORECAST PERIOD. BY
THE SECOND AND THIRD DAYS THE EFFECT OF THE OBSERVED CMES ARE
FORECAST TO INCREASE THE FIELD TO UNSETTLED TO ACTIVE CONDITIONS
WITH A CHANCE FOR MINOR STORMING.
III. Event Probabilities 24 JUN to 26 JUN
| Class M | 60% | 60% | 60% |
| Class X | 05% | 05% | 05% |
| Proton | 20% | 20% | 20% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 23 JUN 168 Predicted 24 JUN-26 JUN 175/180/180 90 Day Mean 23 JUN 138
V. Geomagnetic A Indices
OBSERVED AFR/AP 22 JUN 003/004 ESTIMATED AFR/AP 23 JUN 005/005 PREDICTED AFR/AP 24 JUN-26 JUN 005/005-015/015-015/015
VI. Geomagnetic Activity Probabilities 24 JUN to 26 JUN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 35% | 35% |
| Minor storm | 05% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 40% | 40% |
| Minor storm | 05% | 20% | 20% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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