@article{oai:jaxa.repo.nii.ac.jp:00031517,
 author = {堤, 四郎 and TSUTSUMI, Shiro},
 issue = {3_B},
 journal = {東京大学宇宙航空研究所報告},
 month = {Sep},
 note = {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., 資料番号: SA0124425000},
 pages = {569--576},
 title = {超高層大気内電離雲による電波の後方散乱},
 volume = {10},
 year = {1974}
}