Affichage des archives de samedi, 17 avril 1999
Rapport d'activité solaire
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.
Rapport d'activité solaire et géophysique 1999 Apr 17 2200 UTCFait par le NOAA © SWPC et adapté par SpaceWeatherLive.com
Rapport de l'USAF/NOAA sur l'activité solaire et géophysique
SDF numéro 107 publié à 2200Z le 17 APR 1999IA. Analyse des régions solaires actives et activité du 16-2100Z au 17-2100Z SOLAR ACTIVITY WAS VERY LOW. TWO NEW REGIONS WERE
ASSIGNED TODAY: REGION 8518 NEAR S16E66 AND REGION 8519 NEAR N17W33.
TWO FILAMENTS ERUPTED DURING THE PERIOD: AN 8 DEGREE FILAMENT NEAR
S19W08 BETWEEN 16/2144UT AND 17/1116UT AND A 20 DEGREE FILAMENT NEAR
S32W15 BETWEEN 17/1640-1830UT.
IB. Prévisions d'activité solaire
SOLAR ACTIVITY IS EXPECTED TO BE LOW
FOR THE NEXT THREE DAYS.
IIA. Résumé de l'activité géophysique du 16-2100Z au 17-2100Z
THE GEOMAGNETIC FIELD RANGED FROM UNSETTLED TO MAJOR STORM LEVELS. A
GEOMAGNETIC DISTURBANCE THAT BEGAN WITH A SUDDEN IMPULSE YESTERDAY
AT 16/1126Z INTENSIFIED INTO A GEOMAGNETIC STORM. MID-LATITUDES WERE
AT MINOR TO MAJOR STORM LEVELS ON THE 17TH FROM 00-09UT AND HIGH
LATITUDES WERE AT MAJOR TO SEVERE STORM LEVELS DURING THE SAME TIME
INTERVAL. THE DISTURBANCE SUBSIDED AFTER 0900Z WITH PREDOMINANTLY
UNSETTLED CONDITIONS PREVAILING FROM 1200 TO THE END OF THE DAY.
IIB. Prévision de l'activité géophysique
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY UNSETTLED FOR THE NEXT 24 HOURS, AND IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE SECOND AND THIRD DAYS.
III. Probabilité d'éruption solaire du 18 APR au 20 APR
| Classe M | 15% | 15% | 15% |
| Classe X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Flux Penticton 10.7 cm
Observé 17 APR 116 Prévisionnel 18 APR-20 APR 114/112/110 Moyenne des 90 derniers jours 17 APR 134
V. Indice géomagnetique A
OBSERVED AFR/AP 16 APR 013/014 ESTIMATED AFR/AP 17 APR 035/045 PREDICTED AFR/AP 18 APR-20 APR 010/010-005/010-010/012
VI. Probabilités d'activité géomagnétique du 18 APR au 20 APR
| A. Latitudes moyennes | |||
|---|---|---|---|
| Actif | 20% | 15% | 15% |
| Tempête mineure | 10% | 10% | 10% |
| Tempête majeure/sévère | 05% | 01% | 01% |
| B. Hautes latitudes | |||
|---|---|---|---|
| Actif | 35% | 25% | 20% |
| Tempête mineure | 15% | 10% | 10% |
| Tempête majeure/sévère | 10% | 05% | 05% |
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