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3D multi-fluid MHD studies of the solar wind interaction with Mars

机译:太阳风与火星相互作用的3D多流体MHD研究

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The interaction of the solar wind with planets with no or only very weak intrinsic magnetic fields, such as Mars and Venus, involves their ionospheres. Single fluid MHD models, which incorporate some of the important mass-loading processes, have been useful in reproducing numerous observed features at these planets, such as the location of the bow shock, but they do have obvious limitations. Our present 3D MHD model is a two-fluid one, which considers protons and the dominant heavy ions in the ionosphere, separately. We have used this model to study the interaction processes at Mars. The model results are in general agreement with the average observed bow shock shape and position and predict reasonable locations for the ionopause. The calculated oxygen escape flux down the tail was estimated to be 2.7 × 10~(25) s~(-1), which is consistent with Phobos-2 estimates.
机译:太阳风与没有或只有很弱的固有磁场的行星(例如火星和金星)的相互作用涉及它们的电离层。包含某些重要质量加载过程的单流体MHD模型在重现这些行星上的许多观测特征(例如弓首震荡的位置)时非常有用,但它们确实有明显的局限性。我们目前的3D MHD模型是两流体模型,它分别考虑了质子和电离层中的主要重离子。我们已经使用该模型研究了火星上的相互作用过程。模型结果与观察到的弓形冲击的平均形状和位置基本吻合,并预测了离子绝经的合理位置。从尾部算起的氧气逸出通量估计为2.7×10〜(25)s〜(-1),与Phobos-2的估算值一致。

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