Simultaneous observation of the electron acceleration and ion deceleration over lunar magnetic anomalies

Yoshifumi Saito, Masaki N. Nishino, Masaki Fujimoto, Tadateru Yamamoto, Shoichiro Yokota, Hideo Tsunakawa, Hidetoshi Shibuya, Masaki Matsushima, Hisayoshi Shimizu, Futoshi Takahashi

研究成果: Contribution to journalArticle査読

60 被引用数 (Scopus)

抄録

At ∼25 km altitude over magnetic anomalies on the Moon, the deceleration of the solar wind ions, acceleration of the solar wind electrons parallel to the magnetic field, and heating of the ions reflected by magnetic anomalies were simultaneously observed by MAP-PACE on Kaguya. Deceleration of the solar wind ions was observed for two major solar wind ion compositions: protons and alpha particles. Deceleration of the solar wind had the same ΔE/q (ΔE: deceleration energy, q: charge) for both protons and alpha particles. In addition, the acceleration energy of the electrons was almost the same as the deceleration energy of the ions. This indicates the existence of an anti-moonward electric field over the magnetic anomaly above the altitude of Kaguya. The reflected ions were observed in a much larger area than the area where magnetic field enhancement was observed. These reflected ions had a higher temperature and lower bulk velocity than the incident solar wind ions. This suggests the existence of a non-adiabatic dissipative interaction between solar wind ions and lunar magnetic anomalies below Kaguya.

本文言語英語
ページ(範囲)83-92
ページ数10
ジャーナルearth, planets and space
64
2
DOI
出版ステータス出版済み - 2012
外部発表はい

All Science Journal Classification (ASJC) codes

  • 地質学
  • 宇宙惑星科学

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