Inductive ionospheric solver for magnetospheric MHD simulations

H. Vanhamäki

    研究成果: ジャーナルへの寄稿学術誌査読

    10 被引用数 (Scopus)

    抄録

    We present a new scheme for solving the ionospheric boundary conditions required in magnetospheric MHD simulations. In contrast to the electrostatic ionospheric solvers currently in use, the new solver takes ionospheric induction into account by solving Faraday's law simultaneously with Ohm's law and current continuity. From the viewpoint of an MHD simulation, the new inductive solver is similar to the electrostatic solvers, as the same input data is used (field-aligned current [FAC] and ionospheric conductances) and similar output is produced (ionospheric electric field). The inductive solver is tested using realistic, databased models of an omega-band and westward traveling surge. Although the tests were performed with local models and MHD simulations require a global ionospheric solution, we may nevertheless conclude that the new solution scheme is feasible also in practice. In the test cases the difference between static and electrodynamic solutions is up to ∼10 V kmg-1 in certain locations, or up to 20-40% of the total electric field. This is in agreement with previous estimates. It should also be noted that if FAC is replaced by the ground magnetic field (or ionospheric equivalent current) in the input data set, exactly the same formalism can be used to construct an inductive version of the KRM method originally developed by Kamide et al. (1981).

    本文言語英語
    ページ(範囲)97-108
    ページ数12
    ジャーナルAnnales Geophysicae
    29
    1
    DOI
    出版ステータス出版済み - 2011

    !!!All Science Journal Classification (ASJC) codes

    • 天文学と天体物理学
    • 地質学
    • 大気科学
    • 地球惑星科学(その他)
    • 宇宙惑星科学

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