Mirror instability and L‐mode electromagnetic ion cyclotron instability: Competition in the Earth's magnetosheath
Mirror instability and L‐mode electromagnetic ion cyclotron instability: Competition in the Earth's magnetosheath
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DOI：
10.1029/2008ja014038
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发表时间：
2009-10
影响因子：
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通讯作者：
M. Shoji;Y. Omura;B. Tsurutani;O. Verkhoglyadova;B. Lembége
中科院分区：
文献类型：
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作者：
M. Shoji;Y. Omura;B. Tsurutani;O. Verkhoglyadova;B. Lembége
我们进行了两个二维和三维的混合模拟之间的竞争过程的L-模式电磁离子回旋（EMIC）和镜不稳定性，假设各向异性的能量离子与T/T = 4.0。在二维模型中，线性增长阶段的EMIC波的能量较高，因为它的增长率大于镜像模式。然而，在三维模型中，镜模波的能量始终大于EMIC波的能量，因为镜模波的波数谱形成环形结构。我们还从理论上导出了镜不稳定性占优势的必要条件
We performed both two- and three-dimensional hybrid simulations of the competing processes between the L-mode electromagnetic ion cyclotron (EMIC) and mirror instabilities, assuming anisotropic energetic ions with T ⊥ /T ∥ = 4.0. In the two-dimensional model, the energy of the EMIC waves is higher at the linear growth phase because its growth rate is larger than that of the mirror mode. In the three-dimensional model, however, the energy of the mirror mode waves is larger than that of the EMIC waves for all times because the wave number spectra of mirror mode waves form torus-like structures. We also theoretically derived a necessary condition for the dominance of the mirror instability