Effects of a Weak Intrinsic Magnetic Field on Atmospheric Escape From Mars

Shotaro Sakai, Kanako Seki, Naoki Terada, Hiroyuki Shinagawa, Takashi Tanaka, Yusuke Ebihara

研究成果: Article査読

15 被引用数 (Scopus)

抄録

The magnetization of a planet significantly changes the nature of atmospheric escape, and the question of whether a planetary field shields atmosphere from erosion by the solar wind or not remains open. Ion escape processes from Mars are investigated under two hypothetical conditions, namely, no intrinsic magnetic field and weak intrinsic dipole field cases under present solar wind conditions based on multispecies magnetohydrodynamics simulations. The existence of a weak dipole field results in an enhancement of the tailward flux of planetary ions through the four escape channels. Two channels are associated with the open fields at the poles, and the others are caused by magnetic reconnection between the planetary and solar wind magnetic fields at the flank magnetopause. The ion escape rate with the weak dipole is greater than in the no-dipole case. The enhancement is significant for O2 + and CO2 +, suggesting ion escape from the low-altitude ionosphere.

本文言語English
ページ(範囲)9336-9343
ページ数8
ジャーナルGeophysical Research Letters
45
18
DOI
出版ステータスPublished - 2018 9 28

ASJC Scopus subject areas

  • 地球物理学
  • 地球惑星科学(全般)

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