@article{oai:jaxa.repo.nii.ac.jp:00032672,
 author = {長野, 勇 and 満保, 正喜 and 深見, 哲男 and 外村, 雅治 and NAGANO, Isamu and MAMBO, Masayoshi and FUKAMI, Tetsuo and TOMURA, Masaharu},
 journal = {宇宙科学研究所報告},
 month = {Jul},
 note = {The collision frequency profile in the altitude range from 80km to 110km is estimated by using the simultaneous observation of a ground based VLF signal and Langmuir probe current by a rocket. The altitude profile of the right-handed circularly polarized component of the 17.4kHz signal transmitted from Yosami near Nagoya was observed by a sounding rocket K-9M-72. The collision frequency for mono-energetic electrons in the lower ionosphere is expressed as ν_m=K_m×10^5P where the value of K_m is called collision proportionality factor. P is the atmospheric pressure and is taken from CIRA model in this paper. Analysis of the observed signal intensities is based on the generalized full wave method. As a result, the collision proportionality factor K_m was shown to be a function of altitude and varied from 4.4 to 10.5. In particular, the K_m increased rapidly at the altitude of around 100km. This result means that the ratio of the electron temperature to the neutral temperature becomes progressively higher value from 1.0 to about 1.7 in the altitude between 100km and 108km., 資料番号: SA0166075000},
 pages = {1--14},
 title = {Estimation of Collision Frequency in the Lower Ionosphere by means of K-9M-72 Rocket},
 volume = {27},
 year = {1985}
}