JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
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titleThe Mercury Sodium Atmosphere Spectral Imager (MSASI)
Other TitleThe Mercury Sodium Atmosphere Spectral Imager (MSASI)
Author(jpn)野澤 宏大; 吉川 一朗; 亀田 真吾; 三澤 浩昭; 岡野 章一; 田口 真; 山崎 敦; 笠羽 康正; 高見沢 広司; Korablev, Oleg
Author(eng)Nozawa, Hiromasa; Yoshikawa, Ichiro; Kameda, Shingo; Misawa, Hiroaki; Okano, Shoichi; Taguchi, Makoto; Yamazaki, Atsushi; Kasaba, Yasumasa; Takamizawa, Koji; Korablev, Oleg
Author Affiliation(jpn)立教大学; 東京大学; 東京大学; 東北大学; 東北大学; 国立極地研究所; 東北大学; 宇宙航空研究開発機構 宇宙科学研究本部; 東北大学; Russian Academy of Sciences Space Research Institute
Author Affiliation(eng)Rikkyo University; University of Tokyo; University of Tokyo; Tohoku University; Tohoku University; National Institute of Polar Research; Tohoku University; Japan Aerospace Exploration Agency Institute of Space and Astronautical Science; Tohoku University; Russian Academy of Sciences Space Research Institute
Issue Date2005-11-30
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication date2005-11-30
AbstractThe Mercury Sodium Atmosphere Spectral Imager (MSASI) on the BepiColombo/Mercury Magnetospheric Orbiter (MMO) is a high-dispersion Fabry-Perot imager. MSASI will address a wealth of fundamental scientific questions pertaining to the Mercury's exosphere. Together, our measurement on the overall scale will provide ample new information on regolith-exosphere-magnetosphere coupling as well as new understanding of the dynamics governing the 'surface-bounded exosphere'. It arises quite clearly from continuous ground-based observations that the regolith of Mercury releases a fraction of its content to Mercury's exosphere. Some processes are identified up to now as leading to this ejection. These processes are associated with different energies of ejection, behavior in different regions of Mercury's surface and eject different types of population from the surface. The responsible processes are (1) Chemical sputtering, (2) Thermal desorption, (3) Photon-stimulated desorption, (4) Ion sputtering, and (5) Micro-meteoroid impact/vaporization. Each candidate seems to be fairly operative, but any cannot completely explain phenomena observed from the Earth. Also, the fate of ejecta from the regolith is still unknown. Some are expected to return to the lithosphere, the others are lost to interplanetary space. Circulation of lithospheric sodium atoms via exosphere-magnetosphere might bring a significant change in the composition of surface layer on Mercury. The MSASI measurements clearly and definitely can identify the release mechanism, how exospheric sodium is born from the regolith, and bring comprehensive picture of global circulation of regolith materials. Also, BepiColombo is the first and unique opportunity to study the formation, circulation, maintenance of this surface-bounded exosphere, which is a different type of terrestrial atmosphere. Below we describe in somewhat more detail the primary scientific objectives of MSASI.
DescriptionJAXA Research and Development Report
KeywordsMercury sodium atmosphere spectral imager; Mercury atmosphere; BepiColombo; Mercury magnetospheric orbiter; CMOS image sensor; microchannel plate; etalon; optical filter; image intensifier; Fabry-Perot interferometer; exosphere; 水星ナトリウム大気分光撮像装置; 水星大気; BepiColombo; 水星磁気圏探査機; CMOSイメージセンサ; マイクロチャネルプレート; エタロン; 光学フィルタ; イメージインテンシファイアー; ファブリペロー干渉計; 外気圏
Document TypeTechnical Report
JAXA Category研究開発報告
Report NoJAXA-RR-05-007E

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