Viewing archive of Friday, 19 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 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 353 Issued at 2200Z on 19 DEC 1997IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z SOLAR ACTIVITY WAS LOW. A LONG DURATION C1 EVENT BEGAN
WITH A SLOW RISE IN X-RAY BACKGROUND LEVELS AT APPROXIMATELY
19/1800Z, REACHED THE C1 THRESHOLD AT 19/2005Z, AND REMAINED AT THAT
LEVEL FOR APPROXIMATELY 50 MINUTES BEFORE BEGINNING A GRADUAL
DECLINE. THIS EVENT WAS NOT CORRELATED TO THE ONLY ACTIVE REGION
CURRENTLY ON THE VISIBLE DISK, 8123 (N18W08), AND IS THOUGHT TO BE
ASSOCIATED WITH A NEW REGION PREPARING TO ROTATE AROUND THE
SOUTHEAST LIMB.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET AT ALL LATITUDES FOR THE PAST 24
HOURS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT THREE DAYS.
III. Event Probabilities 20 DEC to 22 DEC
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 19 DEC 090 Predicted 20 DEC-22 DEC 084/084/084 90 Day Mean 19 DEC 093
V. Geomagnetic A Indices
OBSERVED AFR/AP 18 DEC 006/006 ESTIMATED AFR/AP 19 DEC 003/003 PREDICTED AFR/AP 20 DEC-22 DEC 010/010-010/012-010/010
VI. Geomagnetic Activity Probabilities 20 DEC to 22 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 00% | 00% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 15% |
| Minor storm | 05% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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