@inproceedings{oai:jaxa.repo.nii.ac.jp:00020366,
 author = {西野, 真木 and 藤本, 正樹 and 前澤, 洌 and 齋藤, 義文 and 横田, 勝一郎 and 浅村, 和史 and 田中, 孝明 and 綱川, 秀夫 and 渋谷, 秀敏 and 松島, 政貴 and Nishino, Masaki N. and Fujimoto, Masaki and Maezawa, Kiyoshi and Saito, Yoshifumi and Yokota, Shoichiro and Asamura, Kazushi and Tanaka, Takaaki and Tsunakawa, Hideo and Shibuya, Hidetoshi and Matsushima, Masaki},
 book = {月・惑星シンポジウム, Proceedings of the ISAS lunar and planetary symposium},
 month = {Aug},
 note = {第42回 月・惑星シンポジウム(2009年8月5-7日, 宇宙航空研究開発機構宇宙科学研究本部), The 42nd ISAS Lunar and Planetary Symposium (August 5-7, 2009. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)), Sagamihara, Kanagawa Japan, We study solar wind (SW) intrusion into the near-Moon wake using plasma data obtained by the SELENE (KAGUYA) spacecraft. It has been known that SW protons flowing around the Moon access the central region of the distant lunar wake, while SW intrusion deep into the near-Moon wake has never been expected. Here we review two mechanisms (which we call type-I and type-II, respectively) of SW proton entry deep into the near-Moon wake, using plasma and magnetic field data obtained by the SELENE spacecraft at 100 km height from the lunar surface. The key process of the type-I entry is acceleration of the SW protons by the ambipolar electric field around the wake boundary. This entry mechanism lets the SW protons come fairly deep into the wake (solar zenith angle (SZA) 150 degrees) at 100 km height. On the other hand, the type-II entry is based on the SW proton scattering on the dayside; SW protons are once scattered at the lunar dayside surface, picked-up by the SW motional electric field, and finally access the deepest wake (150<SZA<180 degrees). Both entry mechanisms occur in the direction perpendicular to the interplanetary magnetic field, but only type-II mechanism lets the SW protons come into the deepest wake that the SW protons are not anticipated to access. The type-II entry forms the proton-governed region (PGR) in one hemisphere of the near-Moon wake, giving rise to a strong asymmetry of the near-Moon wake environment. Our results mean that not only SW electrons but also protons are crucial for plasma environment in the wake., 形態: カラー図版あり, 形態: CD-ROM1枚, 著者人数: 13人, Physical characteristics: Original contains color illustrations, Number of authors: 13, Note: One CD-ROM, 資料番号: AA0064739022},
 pages = {92--95},
 publisher = {宇宙航空研究開発機構宇宙科学研究本部, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)},
 title = {Two mechanisms of solar-wind proton entry deep into the near-Moon wake revealed by SELENE (Kaguya)},
 volume = {42},
 year = {2009}
}