Application of a Scale Normalization Technique for High Resolution Analysis of the Magnetosheath at Mars

IF 2.6 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Jacob Fruchtman, Jasper Halekas, Francis G. Eparvier, Jacob Gruesbeck, Christian Mazelle, David Mitchell
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Abstract

In order to study spatial distributions of global magnetosheath structures, physicists often rely upon spatial binning, whereby space is divided into cells, each filled with the average value of all spacecraft measurements within that cell. The traditional binning schema utilizes a fixed Cartesian grid of cube bins. The morphology of the magnetosheath's boundaries are not fixed, however, but driven by upstream and planetary conditions. Therefore, the spatial structures are not fixed in Cartesian space, and thus a Cartesian binning technique will produce a highly coarse grained spatial distribution. We propose an alternative binning technique utilizing a scale normalized dimensionless coordinate system defined in terms of magnetosheath morphology. To demonstrate the efficacy of this technique, we apply a basic implementation to the Martian system. We are thereby able to achieve a high-resolution spatial mapping of bow shock and magnetosheath processes and resolve spatial structures that are washed out when binned traditionally. In particular, we can resolve the shock overshoot, analyze the dominant forces acting at the shock, and obtain fine-scale distributions of the bulk ion plasma magnetosheath forces and thermalization mechanisms. Magnetic tension and magnetic pressure gradient are compared. The ion pressure divergence at the shock is found to significantly vary in line with the solar wind temperature anisotropy. The dependency of the mirror mode instability on location and Mach number, and its implications for thermalization processes in the small Martian magnetosheath are investigated.

Abstract Image

应用尺度归一化技术对火星磁鞘进行高分辨率分析
为了研究全球磁鞘结构的空间分布,物理学家通常采用空间分选法,即将空间划分为若干单元,每个单元内填入该单元内所有航天器测量值的平均值。传统的分选模式采用固定的立方体网格。然而,磁鞘边界的形态并不是固定不变的,而是受上游和行星条件的影响。因此,空间结构在笛卡尔空间中并不是固定不变的,因此笛卡尔分选技术将产生高度粗粒度的空间分布。我们提出了另一种分选技术,利用根据磁鞘形态定义的尺度归一化无量纲坐标系。为了证明这种技术的有效性,我们在火星系统中进行了基本实施。因此,我们能够获得弓形冲击和磁鞘过程的高分辨率空间分布图,并分辨出传统分选时被冲淡的空间结构。特别是,我们可以解决冲击过冲问题,分析作用于冲击的主要力量,并获得大量离子等离子体磁鞘力和热化机制的精细分布。比较了磁张力和磁压梯度。发现冲击处的离子压力发散随太阳风温度各向异性而显著变化。研究了镜像模式不稳定性对位置和马赫数的依赖性,及其对小型火星磁鞘热化过程的影响。
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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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