Structure of a Quasi-parallel Shock Front
Structure of a Quasi-parallel Shock Front
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DOI：
10.3847/1538-4357/ad0b71
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发表时间：
2023-12
期刊：
影响因子：
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通讯作者：
M. Balikhin;M. Gedalin;S. Walker;O. Agapitov;Tielong Zhang
中科院分区：
文献类型：
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作者：
M. Balikhin;M. Gedalin;S. Walker;O. Agapitov;Tielong Zhang
本研究的目的是比较观测到的准平行无碰撞冲击波阵面的磁场结构的观测结果与分析得到的结果。在激波为平面静止激波的假设下，推导了激波阵面结构的双流体解析模型。离子和电子的动力学压力被假定为标量，并使用多方状态方程。分析结果表明，冲击磁场具有振荡结构。金星快车（VEX）对金星弓形激波的观测已经被用来验证这些理论发现。金星的弓形激波和相应的前震明显小于地球。因此，观测金星准平行激波的基本结构并没有被前震中产生的高振幅波和非线性结构所掩盖。它表明，结构的冲击波阵面，所观察到的VEX，具有很强的相似性，得到的结构分析。
The aim of this study is to compare observations of the magnetic field structure of observed quasi-parallel collisionless shock fronts with the results obtained analytically. A two-fluid analytic model of the shock front structure was derived under the assumptions that the shock is stationary and planar. The ion and electron kinetic pressures were assumed to be scalar, and polytropic state equations were used. The results of this analytical approach show that the shock magnetic field has an oscillatory structure. Venus Express (VEX) observations of the Venusian bow shock have been used to validate these theoretical findings. The Venusian bow shock and corresponding foreshock are significantly smaller than those of Earth. Thus, observations of the underlying structure of the quasi-parallel shock at Venus are not masked by the presence of high-amplitude waves and nonlinear structures originating in the foreshock. It is shown that the structure of the shock front, as observed by VEX, has a very strong similarity to the structure obtained analytically.