Magnetic field configurations of a magnetar throughout its interior and exterior - core, crust and magnetosphere

Kotaro Fujisawa*, Shota Kisaka

*この研究の対応する著者

    研究成果: Article査読

    24 被引用数 (Scopus)

    抄録

    We obtained the magnetic field configurations, including both poloidal and toroidal components, throughout the interior and exterior of magnetars using a realistic equation of state. We divided the magnetized star into the hydromagnetic equilibrium core, Hall equilibrium crust and twisted force-free magnetosphere.We systematically and simultaneously calculated these regions under various boundary conditions using the Green function relaxation method, and noted the following interesting characteristics of these numerical results. First, the strength and structure of core magnetic fields affect the crustal magnetic fields. Secondly, the current sheet on the core-crust interface affects both internal and external magnetic field configurations. Thirdly, the twisted magnetosphere makes a cross-point of magnetic field lines, such as X-point geometry, in the magnetosphere. The X-point geometry appears and disappears according to the strength of the twisted field in the magnetosphere or the core-crust boundary conditions. Our results mean that both Hall magnetohydrodynamic secular evolution and magnetospheric dynamical evolution are deeply affected by conditions of another region and the core-crust stress of magnetars.

    本文言語English
    ページ(範囲)2777-2793
    ページ数17
    ジャーナルMonthly Notices of the Royal Astronomical Society
    445
    3
    DOI
    出版ステータスPublished - 2014 9月 5

    ASJC Scopus subject areas

    • 宇宙惑星科学
    • 天文学と天体物理学

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