Viewing archive of Thursday, 11 December 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 Dec 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 345 Issued at 2200Z on 11 DEC 1997IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS VERY LOW. SEVERAL OPTICALLY
UNCORRELATED B CLASS X-RAY BURSTS AND MINOR RADIO SWEEPS OCCURRED
THROUGHOUT THE PERIOD. REGION 8119 (N32W38) CONTINUES TO EXHIBIT
SLOW GROWTH AND IS NOW A 15 SPOT DSO BETA GROUP. NEW REGION 8122
(N31W06) WAS NUMBERED TODAY AND DEVELOPED IMPRESSIVELY INTO AN 18
SPOT DRO BETA GROUP. THE REMAINING REGIONS WERE QUIET AND STABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
VERY LOW TO LOW. REGION 8119 HAS POTENTIAL FOR ISOLATED C-CLASS
FLARING. ISOLATED C-CLASS ACTIVITY IS ALSO POSSIBLE IN REGION
8122. IF THIS REGION CONTINUES TO DEVELOP, ESPECIALLY AT ITS
PRESENT GROWTH RATE, IT MAY SOON BE CAPABLE OF PRODUCING M-CLASS
ACTIVITY.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE. THE DISTURBANCE, WHICH
BEGAN YESTERDAY, IS STARTING TO SUBSIDE. THE FIELD IS NOW AT
PREDOMINANTLY QUIET TO UNSETTLED LEVELS. THE GREATER THAN 2 MEV
ELECTRON FLUX REACHED HIGH LEVELS LATE IN THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED. HIGH LATITUDES MAY EXPERIENCE
ISOLATED PERIODS OF ACTIVE CONDITIONS.
III. Event Probabilities 12 DEC to 14 DEC
| Class M | 05% | 15% | 15% |
| Class X | 01% | 01% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 DEC 096 Predicted 12 DEC-14 DEC 094/094/096 90 Day Mean 11 DEC 094
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 DEC 015/015 ESTIMATED AFR/AP 11 DEC 010/015 PREDICTED AFR/AP 12 DEC-14 DEC 010/010-010/008-010/008
VI. Geomagnetic Activity Probabilities 12 DEC to 14 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 15% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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