The laser radar system for measurement of the middle atmosphere at Syowa Station in Antarctica

• Main Authors: Yasunobu Iwasaka, Takeo Hirasawa, Hiroshi Fukunishi, Ryoichi Fujii, Hiroshi Miyaoka, Syoji Ito, Noboru Yasuda, Hiroyasu Ohtani
• Format: Article in Journal/Newspaper
• Language: English
• Published: National Institute of Polar Research 1983
• Subjects: geo; Antarctic; Syowa Station; Antarc*; Antarctica
• Online Access: https://doi.org/10.15094/00008379; https://doaj.org/article/0e45e73351954fe9a7599f84e4e736cd

Multiwavelength laser radar system was installed at Syowa Station in 1983 by the 24th Japanese Antarctic Research Expedition for measurement of the middle atmospheric phenomena in cooperation with International Middle Atmosphere Program (MAP). The laser radar can simultaneously shoot two kinds of laser pulses (0.6943μm : the fundamental wave, 0.3471μm : the second harmonic wave) by means of ruby laser with regulated repetition frequencies (maximum : 1Hz) and receive scattered light by a telescope with the 50 cmφ-lens in efficient diameter. The measurement can be done by using a photon counter for each wave and A-scope for the fundamental wave. The test observation had been successfully made in Japan and it showed the remarkable increases of the strato-spheric aerosol due to the volcanic eruption of Mt. El Chichon. It was also inferred that the size distribution of the particles in the aerozol layer is inhomogeneous.