Viewing archive of Saturday, 22 November 1997
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 1997 Nov 22 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 326 Issued at 2200Z on 22 NOV 1997IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z SOLAR ACTIVITY REMAINED LOW. TWO OPTICALLY UNCORRELATED
C1 FLARES OCCURRED. REGION 8108 (N19W37) WAS GENERALLY STABLE BUT
BRIGHTNESS FLUCTUATIONS AND SUBFLARE RATES DECREASED. A MAGNETIC
DELTA CONFIGURATION REMAINED BUT WEAKENED SLIGHTLY. NEW REGION 8111
(N23E74) ROTATED AROUND THE LIMB AS A SMALL CLASS C SUNSPOT GROUP
THAT EXHIBITED SOME EXTENSIVE SURGING. WEAK PLAGE AND ACTIVE SURGING
WERE OBSERVED AT THE SOUTHEAST LIMB WHERE PREVIOUSLY ACTIVE REGION
8100 IS RETURNING.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW. REGION 8108 REMAINS CAPABLE OF PRODUCING C-CLASS EVENTS AND
ISOLATED M-CLASS FLARES. AT THIS TIME, OLD REGION 8100 APPEARS TO
HAVE DECAYED SIGNIFICANTLY ON ITS INVISIBLE HEMISPHERE TRANSIT. AT
THIS TIME, ISOLATED C-CLASS EVENTS ARE EXPECTED FROM THIS AREA.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
THE GEOMAGNETIC FIELD WAS QUIET AT THE BEGINNING OF THE PERIOD.
UNSETTLED TO ACTIVE CONDITIONS WERE OBSERVED FROM 22/0000-0900Z.
SOLAR WIND DATA INDICATED INCREASES IN VELOCITY AND DENSITY AROUND
22/0500Z. MINOR TO SEVERE STORM CONDITIONS OCCURRED FROM
22/0900-1800Z. IT IS POSSIBLE TO LIKELY THAT THIS DISTURBANCE IS
RELATED TO THE HALO CORONAL MASS EJECTION OF 17 NOV. THE FIELD WAS
ACTIVE AT THE END OF THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
FORECAST TO BE AT UNSETTLED TO MINOR STORM LEVELS ON 23 NOV IN
RESPONSE TO A VERY LONG DURATION X-RAY EVENT ON 19-20 NOV. ISOLATED
MAJOR STORM CONDITIONS ARE POSSIBLE ON THAT DAY. THE FIELD SHOULD
BECOME UNSETTLED TO ACTIVE ON 24 NOV AND QUIET TO UNSETTLED ON 25
NOV.
III. Event Probabilities 23 NOV to 25 NOV
| Class M | 20% | 20% | 20% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 22 NOV 100 Predicted 23 NOV-25 NOV 103/106/108 90 Day Mean 22 NOV 092
V. Geomagnetic A Indices
OBSERVED AFR/AP 21 NOV 002/002 ESTIMATED AFR/AP 22 NOV 030/035 PREDICTED AFR/AP 23 NOV-25 NOV 020/020-015/015-010/010
VI. Geomagnetic Activity Probabilities 23 NOV to 25 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 20% |
| Minor storm | 25% | 15% | 05% |
| Major-severe storm | 15% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 20% |
| Minor storm | 30% | 15% | 05% |
| Major-severe storm | 20% | 05% | 01% |
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