Soft X‐Ray Imaging of Earth's Dayside Magnetosheath and Cusps Using Hybrid Simulations
Soft X‐Ray Imaging of Earth's Dayside Magnetosheath and Cusps Using Hybrid Simulations
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DOI：
10.1029/2023gl103347
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发表时间：
2023-05
影响因子：
5.2
通讯作者：
J. Ng;B. Walsh;L. Chen;Y. Omelchenko
中科院分区：
文献类型：
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作者：
J. Ng;B. Walsh;L. Chen;Y. Omelchenko
太阳风离子和地球外逸层中的中性氢原子之间的相互作用可以导致软X射线的发射。即将到来的任务，如SMILE和LEXI，旨在使用软X射线成像来研究磁层的全球结构。虽然磁鞘和昼侧磁层顶通常可以由动力学物理驱动，但它通常被用于预测X射线发射的流体模拟所忽略。我们研究了在准径向行星际磁场下使用混合模拟进行软X射线成像的可能结果，其中离子-离子不稳定性驱动超低频前震波，导致磁鞘中的湍流，影响尖点和磁层顶的动力学。我们模拟软X射线发射，以确定LEXI等任务可能看到的内容，并评估识别动力学结构的可能性。虽然动力学结构在高节奏成像中是可见的，但当前仪器可能不具有辨别动力学信号的时间分辨率。
Interactions between solar wind ions and neutral hydrogen atoms in Earth's exosphere can lead to the emission of soft X‐rays. Upcoming missions such as SMILE and LEXI aim to use soft X‐ray imaging to study the global structure of the magnetosphere. Although the magnetosheath and dayside magnetopause can often be driven by kinetic physics, it has typically been omitted from fluid simulations used to predict X‐ray emissions. We study the possible results of soft X‐ray imaging using hybrid simulations under quasi‐radial interplanetary magnetic fields, where ion‐ion instabilities drive ultra‐low frequency foreshock waves, leading to turbulence in the magnetosheath, affecting the dynamics of the cusp and magnetopause. We simulate soft X‐ray emission to determine what may be seen by missions such as LEXI, and evaluate the possibility of identifying kinetic structures. While kinetic structures are visible in high‐cadence imaging, current instruments may not have the time resolution to discern kinetic signals.