Airglow in the near infrared range (λλ 1. 1-2.4μ) was observed by a sounding rocket K-10-4. The rocket roll angle between two intensity maxima due to airglow was found to change as the rocket altitude increased. This allows us to determine the zenith angle of the rocket axis and the height of the air glow layer. The roll angle for the airglow peak wiggled according to the precession of the rocket. The zenith angle of the precession axis and the cone half angle of the precession were thus determined to be 29°±1° and 1.5°, respectively. The heights at the maximum airglow emission were obtained as 72 km for the J band (1.27μ) and 77km for the K-band (2.2μ). Owing to the precession, the airglow emissions at varying local times were obtained. The half-life of an excited state of O_2 emitting 1.27μ, line was obtained to be 30min. This is compared with its half-life of 42 min. for the spontaneous decay.
近赤外夜光の観測とロケットの姿勢決定
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