超高層大気内電離雲による電波の後方散乱

概要

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Backscattering charactaristics of HF radio waves by an ionized cloud in the upper atmosphere have studied in .ray optics method. The results of the calculation with a cloud model having production process of ionization after gas release show that even the small production rate of ionization have the significant effect upon the life-time of the cloud. The recent observations of ionized clouds using ionsonde in a series of cesium and sodium release experiments with the rockets, K-9M-33, K-9M-39, K-9M-42 and K-9M-43, have cosistently suggested that total electron number in the cloud had increased with time after release owing to photo-ionization by solar U.V. radiation. The minimum scattering cross section of the cloud to make the positive signature in ionogram is 1.1-4.5 km2 at the altitude of 100km.
宇宙航空研究開発機構の論文