Scale variability in convection-driven MHD dynamos at low Ekman number

Futoshi Takahashi, Masaki Matsushima, Yoshimori Honkura

研究成果: Contribution to journalArticle査読

51 被引用数 (Scopus)

抄録

We have undertaken a numerical study of convection-driven MHD dynamos in a rapidly rotating spherical shell with the Ekman number, E, down to 2 × 1 0- 6 and the magnetic Prandtl number, Pm, down to 0.2. We focus on the characteristic scales of the flow and the magnetic field. Smaller-scale convection vortices responsible for generating the magnetic field appear at lower Ekman numbers, while the scale of the magnetic field shows less variation compared with the flow. As a result, scale separation between the flow and the magnetic field occurs as the Ekman number is decreased. Scale separation helps dynamos to maintain the magnetic field at P m < 1 through increase in the effective value of the magnetic Reynolds number.

本文言語英語
ページ(範囲)168-178
ページ数11
ジャーナルPhysics of the Earth and Planetary Interiors
167
3-4
DOI
出版ステータス出版済み - 4 2008
外部発表はい

All Science Journal Classification (ASJC) codes

  • 天文学と天体物理学
  • 地球物理学
  • 物理学および天文学(その他)
  • 宇宙惑星科学

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