地球弓形激波平顶电子分布的起源

Q1 Earth and Planetary Sciences Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-04 DOI:10.1093/mnrasl/slad146
Krzysztof Stasiewicz
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引用次数: 0

摘要

摘要对弓形激波中观测到的平顶电子分布进行了解释。结果表明,平顶是由随机波能量机制产生的。首先,我们证明了一维(1D)约简分布函数中的平顶对应于二维分布函数中的环,或者对应于三维的壳分布。环/壳层的速度对应于由波电场引起的E × B速度,$V_{\mathrm{E}{\times}\mathrm{B}}=\波浪{E}_\perp /B$,这是SWE过程的自然结果。利用测试粒子模拟支持的磁层多尺度测量,确定了导致电子平顶分布的过程。
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Origin of flat-top electron distributions at the Earth’s bow shock
ABSTRACT An explanation is provided for flat-top electron distributions observed at the bow shock. It is shown that flat-tops are produced by the stochastic wave energization (SWE) mechanism. First, we demonstrate that flat-tops in one-dimensional (1D) reduced distribution functions correspond to rings in 2D distribution functions, or to shell distributions in 3D. The velocity of the ring/shell corresponds to the E × B velocity due to the wave electric field, $V_{\mathrm{ E}{\times }\mathrm{ B}}=\tilde{E}_\perp /B$, which is a natural consequence of the SWE process. The identification of processes responsible for electron flat-top distributions was made with magnetospheric multiscale measurements supported by test-particle simulations.
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来源期刊
Monthly Notices of the Royal Astronomical Society: Letters
Monthly Notices of the Royal Astronomical Society: Letters Earth and Planetary Sciences-Space and Planetary Science
CiteScore
8.80
自引率
0.00%
发文量
136
期刊介绍: For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.
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