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DECHARGE POINTES [1 record]
Record 1 - internal organization data 2004-03-01
Record 1, English
Record 1, Subject field(s)
- Atmospheric, Climatic and Meteorological Phenomena
Record 1, Main entry term, English
- point discharge
1, record 1, English, point%20discharge
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
A silent non-luminous electrical discharge from a pointed conductor maintained at a potential different from that of the surrounding gas. 2, record 1, English, - point%20discharge
Record number: 1, Textual support number: 1 CONT
In the atmosphere, trees and other grounded objects with points and protuberances may, in disturbed weather, be sources of point discharge current. Close to a pointed and grounded conductor that extends above surrounding objects, the local electric field strength may be many times greater than that existing at the same level far from the elevated conductor. When this local field reaches such a value that a free electron, finding itself acted upon by this field, can be accelerated (in one mean free path) to a sufficiently high velocity to ionize neutral air molecules, point discharge will begin. Different structures will yield point discharge under quite different gross field conditions, for geometry is critically important. Point discharge is recognized as a major process of charge transfer between electrified clouds and the earth, and is a leading item in the charge balance of the global electrical circuit. 3, record 1, English, - point%20discharge
Record 1, French
Record 1, Domaine(s)
- Phénomènes météorologiques, climatiques et atmosphériques
Record 1, Main entry term, French
- effet de pointe
1, record 1, French, effet%20de%20pointe
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- décharge par les pointes 2, record 1, French, d%C3%A9charge%20par%20les%20pointes
correct, feminine noun
- décharge ponctuelle 2, record 1, French, d%C3%A9charge%20ponctuelle
feminine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
Décharge électrique silencieuse et non lumineuse émanant d'un conducteur à pointe maintenu à un potentiel différent de celui du gaz environnant. 2, record 1, French, - effet%20de%20pointe
Record number: 1, Textual support number: 1 CONT
Lors des orages, le champ électrique est inversé par rapport à son état habituel. Sa norme est en moyenne de 10 à 15 kV/m environ. Ce champ peut être fortement modifié par le relief : ce n'est donc qu'une valeur moyenne. Au voisinage des pointes (clochers, arbres, paratonnerres...) le champ peut atteindre des valeurs de l'ordre de 100 kV/m! Cette intensification du champ électrique au voisinage des pointes s'appelle l'effet de pointe. 3, record 1, French, - effet%20de%20pointe
Record number: 1, Textual support number: 1 OBS
Dans l'atmosphère, les arbres et autres objets mis à la masse et pourvus de pointes et de protubérances peuvent être source de courant de décharge de pointe. 2, record 1, French, - effet%20de%20pointe
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Fenómenos meteorológicos, climáticos y atmosféricos
Record 1, Main entry term, Spanish
- descarga de punta
1, record 1, Spanish, descarga%20de%20punta
feminine noun
Record 1, Abbreviations, Spanish
Record 1, Synonyms, Spanish
Record 1, Textual support, Spanish
Record number: 1, Textual support number: 1 DEF
Descarga eléctrica silenciosa y no luminosa que procede de un conductor puntiagudo con un potencial distinto al del medio gaseoso que lo rodea. 1, record 1, Spanish, - descarga%20de%20punta
Record number: 1, Textual support number: 1 OBS
En la atmósfera, los árboles y otros objetos en contacto con el suelo con puntas o protuberancias pueden ser fuentes de descarga de punta. 1, record 1, Spanish, - descarga%20de%20punta
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