ロケット搭載レーザレーダによるエアゾルの観測

概要

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The laser radar system which can be loaded on rocket has been developed, and applied for the measurements of aerosol in upper atmosphere. The laser light was emitted from and the scattered light from surroundings was detected by the system which was loaded on rocket. Four GaAs semiconductor lasers, which were cooled to the liquid N_2 temperature, could emitt about 40 peak watt, 10^<-3> duty cycle pulse laser light at 8, 570Å. The scattered light was detected by N_2 cooled photomultiplier in a phase sensitive photon counting system. The rocket observation experiment was performed at 21.00 on 3 rd, Sept. 1971 by using L-3 H-7 rocket which was launched from Kagoshima Rocket Center. The results are shown in Fig. 6. As the ascent of the rocket the decrease of scattering intensity was observed. This might correspond to the decrease of atmospheric density. At the altitude of 90km and 110km, scattering layers were crearly observed. These layers must have some relations to the appearance of Noctilucent Clouds. At very high altitude, higher than 250km, two scattering layer were observed on both trajectories of ascent and descent. The existense of such layers has not been expected. Farther experiments are need to get more precise results.
宇宙航空研究開発機構の論文