@techreport{oai:jaxa.repo.nii.ac.jp:00002298,
 author = {野澤, 宏大 and 吉川, 一朗 and 亀田, 真吾 and 三澤, 浩昭 and 岡野, 章一 and 田口, 真 and 山崎, 敦 and 笠羽, 康正 and 高見沢, 広司 and Korablev, Oleg and Nozawa, Hiromasa and Yoshikawa, Ichiro and Kameda, Shingo and Misawa, Hiroaki and Okano, Shoichi and Taguchi, Makoto and Yamazaki, Atsushi and Kasaba, Yasumasa and Takamizawa, Koji and Korablev, Oleg},
 month = {Nov},
 note = {The 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., 資料番号: AA0049190000, レポート番号: JAXA-RR-05-007E},
 title = {The Mercury Sodium Atmosphere Spectral Imager (MSASI)},
 year = {2005}
}