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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Magnetic Fields and Plasma Motions in a Hybrid Martian Magnetosphere
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Magnetic Fields and Plasma Motions in a Hybrid Martian Magnetosphere

机译:Magnetic Fields and Plasma Motions in a Hybrid Martian Magnetosphere

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Abstract The Martian magnetosphere contains elements of induced and intrinsic origin. To display them one must use different coordinate systems. Although the solar‐electric coordinate system (Mars Solar Electric [MSE]) adequately describes the main features of the induced magnetosphere, it removes/suppresses aspects caused by the crustal magnetic sources while rotating the spacecraft position to the MSE‐coordinate system and averaging over many orbits. On the other hand, to observe effects of the crustal field one should use the solar orbital coordinates (Mars Solar Orbital [MSO]). To find a compromise and keeping in mind that the most probable value of the clock angle of the interplanetary magnetic field (IMF) on the Mars orbit is ∼90° we can consider separately cases with positive and negative By components of the IMF. It is shown that dynamics of ion fluxes in the distant regions of the magnetosphere is mainly controlled by induced features. However, reconnection of the draping IMF with crustal field leads to a twisting of the classical draping configuration. Despite of the very intricate local geometry of the crustal field, the low‐order harmonics of the magnetic field and mainly the dipole component determine the reconnection sites, at least, statistically for many Mars rotations. For different signs of the By component of the IMF these sites occur either in the +Y‐MSO or −Y‐MSO hemispheres. As a result, statistically the magnetosphere of Mars looks like a hybrid magnetosphere formed during the solar wind interaction with the obstacle which simultaneously contains an extended ionosphere and a weak dipole magnetic field.
机译:抽象的火星磁层包含诱导和内在要素。显示它们必须使用不同的坐标系统。系统充分(火星太阳能电力(MSE))描述了诱导的主要特色磁气圈,它删除/抑制方面由地壳磁源而引起的旋转的航天器的位置MSE的坐标系统和平均在许多轨道。地壳场应该使用太阳能火星轨道坐标(太阳轨道[美索])。找到一个妥协和记住最可能的值时钟的角度行星际磁场(IMF)的火星轨道是∼90°我们可以考虑单独的病例积极和消极的组件国际货币基金组织(IMF)。遥远的地区的磁气圈主要由感应控制功能。重新连接与地壳IMF隔音材料场导致古典的扭曲隔音材料配置。错综复杂的局部几何地壳,低阶谐波磁场和主要是偶极子组件确定重新连接网站,至少,统计许多火星旋转。国际货币基金组织(IMF)的组件发生这些网站在地理+ Y美索或者−Y美索半球。统计上火星磁层的样子像一个混合磁层中形成的太阳风交互的障碍同时包含一个扩展的电离层和一个弱的偶极磁场。

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