Viewing archive of Thursday, 20 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 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 324 Issued at 2200Z on 20 NOV 1997IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z SOLAR ACTIVITY WAS VERY LOW. REGION 8108 (N19W11)
APPEARED TO SIMPLIFY AND DECAY DURING THE PERIOD, AND PRODUCED VERY
LITTLE FLARE ACTIVITY. THE REGION CONSISTS OF APPROXIMATELY 30
SPOTS, WITH SOME MIXTURE OF MAGNETIC POLARITIES. IT MEASURES 260
MILLIONTHS IN WHITE LIGHT AREA. THE OTHER SPOTTED REGION VISIBLE,
8109 (S19E11) WAS QUIET AND STABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
WATCH REGION 8108 FOR C-CLASS FLARES AND, IF SOME RENEWED FLUX
EMERGENCE OCCURS, AN ISOLATED M-CLASS EVENT.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE. EFFECTS OF THE HALO CME ON
NOVEMBER 17 ARE STILL POSSIBLE, AND THE LONG-DURATION C1 FLARE ON
NOVEMBER 19 FROM DISK CENTER MAY BE INDICATIVE OF ANOTHER CME. THE
SECOND CME IS EXPECTED TO IMPACT THE FIELD ON NOVEMBER 23.
III. Event Probabilities 21 NOV to 23 NOV
| Class M | 20% | 20% | 20% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 20 NOV 089 Predicted 21 NOV-23 NOV 090/090/090 90 Day Mean 20 NOV 091
V. Geomagnetic A Indices
OBSERVED AFR/AP 19 NOV 004/003 ESTIMATED AFR/AP 20 NOV 005/005 PREDICTED AFR/AP 21 NOV-23 NOV 015/015-015/015-020/020
VI. Geomagnetic Activity Probabilities 21 NOV to 23 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 40% |
| Minor storm | 10% | 10% | 15% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 50% |
| Minor storm | 15% | 15% | 25% |
| Major-severe storm | 05% | 05% | 05% |
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