Affichage des archives de mardi, 31 août 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 Aug 31 2200 UTCFait par le NOAA © SWPC et adapté par SpaceWeatherLive.com
Rapport de l'USAF/NOAA sur l'activité solaire et géophysique
SDF numéro 243 publié à 2200Z le 31 AUG 1999IA. Analyse des régions solaires actives et activité du 30-2100Z au 31-2100Z SOLAR ACTIVITY RETURNED TO LOW LEVELS. REGION 8681
(N22W30) PRODUCED FOUR MID TO HIGH LEVEL C-CLASS EVENTS. THE LARGEST
WAS A C8/SF AT 31/0554Z. THIS REGION BEGAN TO DECAY BUT RETAINED ITS
ANOMALOUS MAGNETIC STRUCTURE. IN PARTICULAR, THE CENTER NEGATIVE
FIELDS HAVE BECOME PINCHED. REGION 8674 (S23W60) CONTINUED TO DECAY
AND PRODUCED ONLY A FEW MINOR SUBFLARES. THIS REGION RETAINED SOME
MIXED POLARITIES BUT THE DELTA CONFIGURATION APPEARED TO FADE. THE
M3/2B FROM REGION 8681 AT 30/1805Z DID IN FACT PRODUCE A CORONAL
MASS EJECTION. HOWEVER, THE CME WAS FAIRLY NARROW IN LONGITUDINAL
EXTENT AND APPEARED TO PROPAGATE NORTHWARD OUT OF THE ECLIPTIC
PLANE.
IB. Prévisions d'activité solaire
SOLAR ACTIVITY SHOULD BE LOW TO
MODERATE FOR THE NEXT THREE DAYS. REGIONS 8681 AND 8674 REMAIN
CAPABLE OF PRODUCING ISOLATED M-CLASS EVENTS BUT THAT CAPABILITY IS
EXPECTED TO DECREASE AS DECAY IN THESE REGIONS CONTINUES. THE
POSSIBILITY OF A DECAY PHASE MAJOR FLARE FROM REGION 8674 REMAINS.
IIA. Résumé de l'activité géophysique du 30-2100Z au 31-2100Z
THE GEOMAGNETIC FIELD WAS PRIMARILY UNSETTLED TO ACTIVE. THE MOST
DISTURBED PERIOD WAS FROM 31/0600-1200Z. SOLAR WIND VELOCITY
INCREASED SLOWLY DURING THE PERIOD TO NEAR 600 KM/S BUT NO SHOCKS
WERE OBSERVED. ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS ORBIT
REACHED HIGH LEVELS DURING THE PERIOD.
IIB. Prévision de l'activité géophysique
THE GEOMAGNETIC FIELD SHOULD BE
PREDOMINANTLY QUIET TO UNSETTLED FOR THE NEXT THREE DAYS. ISOLATED
ACTIVE CONDITIONS ARE POSSIBLE DURING THAT TIME DUE TO OBLIQUE
IMPACTS FROM RECENT CMES THAT WERE NOT DIRECTLY AIMED AT THE EARTH.
THERE IS A SLIGHT POSSIBILITY OF A SOLAR PROTON EVENT FROM REGION
8674 DURING THE PERIOD.
III. Probabilité d'éruption solaire du 01 SEP au 03 SEP
| Classe M | 50% | 40% | 30% |
| Classe X | 20% | 20% | 15% |
| Proton | 15% | 15% | 10% |
| PCAF | GREEN | ||
IV. Flux Penticton 10.7 cm
Observé 31 AUG 183 Prévisionnel 01 SEP-03 SEP 175/160/148 Moyenne des 90 derniers jours 31 AUG 169
V. Indice géomagnetique A
OBSERVED AFR/AP 30 AUG 013/020 ESTIMATED AFR/AP 31 AUG 014/015 PREDICTED AFR/AP 01 SEP-03 SEP 012/012-010/012-010/012
VI. Probabilités d'activité géomagnétique du 01 SEP au 03 SEP
| A. Latitudes moyennes | |||
|---|---|---|---|
| Actif | 30% | 25% | 20% |
| Tempête mineure | 15% | 10% | 10% |
| Tempête majeure/sévère | 05% | 05% | 05% |
| B. Hautes latitudes | |||
|---|---|---|---|
| Actif | 30% | 30% | 25% |
| Tempête mineure | 15% | 15% | 10% |
| Tempête majeure/sévère | 05% | 05% | 05% |
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