Aucune définition officielle pour le moment...
the region of the earth's atmosphere between the stratosphere and the exosphere, consisting of several ionized layers and extending from about 50 to 250 miles ...
http://dictionary.reference.com/browse/ionosphere
A region of the earth's atmosphere where ionization caused by incoming solar radiation affects the transmission of radio waves. It extends from a height of 70 ...
http://dictionary.reference.com/browse/ionosphere
Partie de l'atmosphère où les molécules sont ionisées par le rayonnement ultraviolet solaire. L'ionosphère terrestre est comprise entre environ 80 et 500 km ...
http://www.thefreedictionary.com/ionosphere
the part of the earth's atmosphere in which ionization of atmospheric gases affects the propagation of radio waves, which extends from about 30 miles (50 ...
http://www.thefreedictionary.com/ionosphere
The ionosphere /a???n??sf??r/ is a region of the upper atmosphere, from about ..... The Maximum Usable Frequency (MUF) is defined as the upper frequency ...
http://www.futura-sciences.com/magazines/espace/infos/dico/d/univers-ionosphere-871/
L'ionosphère est l'atmosphère supérieure d'une planète, en référence à son état de conductibilité électrique qui est caractérisé par une ionisation partielle des ...
http://www.futura-sciences.com/magazines/espace/infos/dico/d/univers-ionosphere-871/
the outer part of the earth's atmosphere, beginning at an altitude of c. 55 km (c. 34 mi) and extending to the highest parts of the atmosphere: it contains several ...
http://www.merriam-webster.com/dictionary/ionosphere
Definition of ionosphere in American English in Oxford dictionary. Meaning, pronunciation and example sentences. English to English reference content (US) .
http://www.merriam-webster.com/dictionary/ionosphere