Particle Simulations on Electrostatic Plasma Environment near Lunar Vertical Holes
三宅, 洋平 ,
西野, 真木 ,
Miyake, YoheiNishino Masaki N.
宇宙航空研究開発機構特別資料: 第12回宇宙環境シンポジウム講演論文集=JAXA Special Publication: Proceeding of the 12th Spacecraft Environment Symposium
346 , 2016-03-11 , 宇宙航空研究開発機構(JAXA) , Japan Aerospace Exploration Agency (JAXA)
Japanese lunar explorer “Kaguya” has discovered vertical holes on the Moon surface. The diameter and depth of the holes are both in a range of 50 through 100m, which produces a higher depth-to-diameter ratio than typical impact craters. The holes are thus expected to create characteristic plasma and dust environment around it. It is of practical importance to assess such a distinctive environment, reminding that a future landing mission plans to explore the lunar holes and caverns associating to the holes. In the present study, we apply our original particle-in-cell simulator EMSES to assessment of day-side plasma environment around lunar vertical holes. We have a three-dimensional computational domain including a simplified lunar hole structure and introduce a solar wind plasma downflow to the lunar surface. We also simulate the photoelectron emission from the lunar surface by taking into account the presence or absence of sunlight illumination, and its incident angle. We will show simulation results on the properties of lunar surface charging near the hole and its dependence on changing solar wind plasma conditions.
会議情報: 第12回 宇宙環境シンポジウム（2015年11月16日-18日. 北九州国際会議場 国際会議室）, 北九州市, 福岡県
Meeting Information: The 12th Spacecraft Environment Symposium (November 16-18, 2015. International Conference Room, Kitakyushu International Conference Center), Kitakyushu, Fukuoka, Japan
Physical characteristics: Original contains color illustrations