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1972
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Henri Debehogne et al., « Formules de base pour la détermination de l'altitude des nuages artificiels », Bulletins de l'Académie Royale de Belgique, ID : 10.3406/barb.1972.60498
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Résumé
Glowing clouds formed near 155 km and 275 km following the release of gaseous methane and oxygen were observed on photographs taken during the evening twilight. A detailed analysis of the altitude calculation is presented.