JpGU-AGU Joint Meeting 2020

Presentation information

[E] Poster

P (Space and Planetary Sciences ) » P-PS Planetary Sciences

[P-PS02] Lunar Science and Exploration

convener:Masaki N Nishino(Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science), Masahiro KAYAMA(Department of General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo), Hiroshi Nagaoka(Japan Aerospace Exploration Agency), Yusuke Nakauchi(Japan Aerospace Exploration Agency)

[PPS02-P02] The lunar tidal dissipation energy by the Earth-moon tide

*Ryuichiro Tanaka1, Satoshi Kaneshima2 (1.Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University, 2.Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University)

Keywords:moon, tide

It is assumed that the magnetic field with the dynamo existed about 4 billion years ago in the moon. It seems that the tidal power is related to this. The moon is being distorted into an oval form by the tidal power, and besides, heating occurs in the lunar inside. The tidal power becomes strong so that the distance from the Earth to the moon is near. Because the distance was nearer than the present in the past, it is assumed that the tidal power is related to the lunar dynamo. In addition, it seems that there is a low viscosity layer in the mantle bottom of the moon from seismic wave observation. Heating by the tidal power grows big in such a layer and may affect the lunar core. In this study, I calculated the lunar tidal dissipation energy and examined the influence that the low viscosity layer gives around.

When the lunar tidal quality factor is 100, I calculated the tidal dissipation energy. I could get the result that the dissipation in the low viscosity layer accounted for 99% of the whole.