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ionospheric layer [1 record]
Record 1 - internal organization data 2004-05-12
Record 1, English
Record 1, Subject field(s)
- Space Physics
Record 1, Main entry term, English
- ionospheric layer
1, record 1, English, ionospheric%20layer
correct, standardized
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
The first ionospheric layer found was the so called E layer or region at about 110 km altitude. It is used by radio operators as a surface from which signals can be reflected to distant stations. It is interesting to note that this works also the other way round and, for example, the auroral kilometric radiation created by the precipitating particles high above the ionosphere does not reach the ground because of the ionospheric E layer. Above the E layer, a F layer consisting of two parts can be found: F1 is at about 170 km, and F2 at about 250 km altitude. Also F layer reflects radio waves. The lowermost region of the ionosphere below 80 km altitude, D layer, however, principally absorbs radio waves. 2, record 1, English, - ionospheric%20layer
Record number: 1, Textual support number: 1 OBS
Ionization appears at a number of atmospheric levels, producing layers or regions which may be identified by their interaction with radio waves. 2, record 1, English, - ionospheric%20layer
Record number: 1, Textual support number: 2 OBS
ionospheric layer: term standardized by ISO. 3, record 1, English, - ionospheric%20layer
Record 1, French
Record 1, Domaine(s)
- Physique spatiale
Record 1, Main entry term, French
- couche ionosphérique
1, record 1, French, couche%20ionosph%C3%A9rique
correct, feminine noun, standardized
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
La couche ionosphérique est donc ionisée, et ce de manière discontinue. Elle a donc été divisée en couches distinctes, la première à avoir été détectée étant la région E (couche de Kennelly-Heaviside). Par ordre alphabétique, on a ensuite la couche F située au-dessus de la couche E. La couche F se subdivise généralement en deux couches, la couche F1 située vers 170 km et la couche F2 située au-delà de 250 km. La couche D, située entre 60 et 90 km échappe au sondage vertical (méthode des échos). De plus, les tailles des différentes couches variant alors avec la température, on peut distinguer une nette différence de leurs importances, selon que ce soit le jour, ou la nuit (pas de couche D, et peu de F). 2, record 1, French, - couche%20ionosph%C3%A9rique
Record number: 1, Textual support number: 1 OBS
couche ionosphérique : terme normalisé par l'ISO. 3, record 1, French, - couche%20ionosph%C3%A9rique
Record 1, Spanish
Record 1, Textual support, Spanish
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