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Earth Planets Space, Vol. 60 (No. 4), pp. 321-332, 2008

Instrumentation and observation target of the Lunar Radar Sounder (LRS) experiment on-board the SELENE spacecraft

Takayuki Ono1, Atsushi Kumamoto1, Yasushi Yamaguchi2, Atsushi Yamaji3, Takao Kobayashi4, Yoshiya Kasahara5, and Hiroshi Oya6

1Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
2Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
3Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
4Korea Institute of Geoscience & Mineral Resources (KIGAM), Yuseong-gu, Daejeon 305-350, Korea
5Information Media Center of Kanazawa University, Kanazawa 920-1192, Japan
6Fukui University of Technology, Fukui 910-8505, Japan

(Received April 4, 2007; Revised October 22, 2007; Accepted November 6, 2007; Online published April 9, 2008)

Abstract: The Lunar Radar Sounder (LRS) on-board the SELENE lunar orbiter is currently being equipped to provide the data of subsurface stratification and tectonic features in the shallow part (several km deep) of the lunar crust, by using an FM/CW radar technique in HF (∼5 MHz) frequency range. Knowledge of the subsurface structure is crucial to better understanding, not only of the geologic history of the Moon, but also of the Moon's regional and global thermal history of the Moon and of the origin of the Earth-Moon system. In addition to the subsurface radar experiment, LRS will provide the spectrum of plasma waves and solar and planetary radio waves in a wide frequency range from 10 Hz to 30 MHz. This paper provides the basic function parameter of the LRS system based on the final function test and proposes observation targets and data analysis that will provide important information leading to a greater understanding of the tectonics and thermal history of the Moon.
Key words: Radar Sounder, HF radar, Moon, subsurface structure, tectonics, thermal history, planetary radio waves.


Corresponding author E-mail: ono@stpp1.geophys.tohoku.ac.jp


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