Solitary Magnetic Structures Developed From Gyro‐Resonance With Solar Wind Ions at Mars and Earth
Solitary Magnetic Structures Developed From Gyro‐Resonance With Solar Wind Ions at Mars and Earth
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DOI：
10.1029/2021gl097600
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发表时间：
2022-01
影响因子：
5.2
通讯作者：
Li‐Jen Chen;J. Halekas;Shan Wang;G. DiBraccio;N. Romanelli;J. Ng;C. Russell;S. Schwartz;D. Sibeck;W. Farrell;C. Pollock;D. Gershman;B. Giles;Y. Collado-Vega
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作者：
Li‐Jen Chen;J. Halekas;Shan Wang;G. DiBraccio;N. Romanelli;J. Ng;C. Russell;S. Schwartz;D. Sibeck;W. Farrell;C. Pollock;D. Gershman;B. Giles;Y. Collado-Vega
我们研究了火星和地球前震中的孤立磁结构。这种结构表现出脉冲状的磁场和密度增强，以及等离子体加热和局部太阳风离子反射。火星上的结构类似于由超低频电磁波与地球上的西南离子回旋共振形成的前震结构，并向磁层传播。我们进行了完整的动力学模拟，再现了孤子结构和离子分布函数的非线性演化，说明了它们与Sw离子的共振。这些结构呈现出自感前震湍流，可能会对空间天气产生影响。我们的结果促进了对Sw如何与行星磁层相互作用的基本理解，并对当前行星起源离子逃逸的图景有潜在的影响。
We investigate solitary magnetic structures in the foreshock of Mars and Earth. The structures exhibit pulse‐like magnetic field and density enhancements along with plasma heating and local solar wind (SW) ion reflection. The structures at Mars resemble the foreshock structures developed from ultra‐low‐frequency electromagnetic waves gyro‐resonant with SW ions at Earth, and propagate toward the magnetosphere. We perform fully kinetic simulations to reproduce the solitary structures and the nonlinear evolution of ion distribution functions, illustrating their resonance with SW ions. The structures present self‐induced foreshock turbulence that can have space weather effects. Our results advance the fundamental understanding of how SW interacts with planetary magnetospheres, and have potential impact on the current picture of planet‐origin ion escape.