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The Magnetic Field Near Mars: A Comparison Between A Hybrid Model, Mars Global Surveyor And Mars Express Observations

机译:火星附近的磁场:混合模型,火星全球测量师和火星快车观测的比较

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Mars Express (MEX) does not carry its own magnetometer which complicates interpretation of ASPERA-3/MEX ion measurements. The direction of the interplanetary magnetic field (IMF) is especially important because it, among other things, determines the direction of the convective electric field and orientation of the cross tail current sheet and tail lobes. In this paper we present a case study to show the properties of the magnetic field near Mars in a quasi-neutral hybrid (QNH) model at the orbits where the Mars Global Surveyor (MGS) has made measurements, present a method to derive the IMF clock angle by comparing fields in a hybrid model and the direction of the magnetic field measured by MGS by deriving the IMF clock angle. We also use H~+ ring velocity distribution observations upstream of the bow shock measured by the IMA/ASPERA-3 instrument on board MEX spacecraft. These observations are used to indirectly provide the orientation of the IMF. We use a QNH model (HYB-Mars) where ions are modeled as particles while electrons form a mass-less charge neutralizing fluid. We found that the direct MGS and non-direct IMA observations of the orientation magnetic field vectors in non-crustal magnetic field regions are consistent with the global magnetic field draping pattern predicted by the global model.
机译:Mars Express(MEX)没有配备自己的磁力计,这使对ASPERA-3 / MEX离子测量的解释变得复杂。行星际磁场(IMF)的方向特别重要,因为它尤其决定了对流电场的方向以及交叉尾电流片和尾瓣的方向。在本文中,我们提供了一个案例研究,以显示在火星全球测量师(MGS)进行测量的轨道上的准中性混合(QNH)模型中火星附近磁场的特性,提出了一种推导IMF的方法通过比较混合模型中的磁场和MGS通过得出IMF时钟角测得的磁场方向来确定时钟角。我们还使用了MEX航天器上IMA / ASPERA-3仪器测量的弓首冲击上游的H〜+环速度分布观测值。这些观察结果用于间接提供IMF的方向。我们使用QNH模型(HYB-Mars),其中离子被建模为粒子,而电子则形成了无质量的电荷中和流体。我们发现,在非地壳磁场区域中定向磁场矢量的直接MGS和非直接IMA观测结果与全局模型预测的全局磁场悬垂模式一致。

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