主波包的全波建模:导管传播和反射波

IF 2.6 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Miroslav Hanzelka, Wen Li, Qianli Ma, Murong Qin, Xiao-Chen Shen, Luisa Capannolo, Longzhi Gan
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引用次数: 0

摘要

电磁离子回旋波可以散射能量为几百千电子伏特或更高的辐射带电子。为了在短时间尺度上准确地预测这种散射和由此产生的相对论性电子的沉淀,我们需要详细了解波场的时空演化,这是单次航天器测量无法获得的。我们的研究提出了从地球偶极磁场的二维时域有限差分(FDTD)模拟中获得的位波模型。我们研究了氢带和氦带波的传播、升音发射、带振幅调制的包和导管波。我们分析了波在时域的传播特性,并与现场观测结果进行了比较。我们发现冷等离子体密度梯度可以保持波矢量的准平行,有效地引导波能量,并对模式转换和反射产生深远的影响。导波的波法向角随纬度的增加而迅速增加,导致离子混合频率的反射,这阻止了低海拔的传播。模拟的波场可以作为相对论性电子和高能离子散射和沉淀的测试粒子分析的输入。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Full-wave modeling of EMIC wave packets: ducted propagation and reflected waves
Electromagnetic ion cyclotron (EMIC) waves can scatter radiation belt electrons with energies of a few hundred keV and higher. To accurately predict this scattering and the resulting precipitation of these relativistic electrons on short time scales, we need detailed knowledge of the wave field’s spatio-temporal evolution, which cannot be obtained from single spacecraft measurements. Our study presents EMIC wave models obtained from two-dimensional (2D) finite-difference time-domain (FDTD) simulations in the Earth’s dipole magnetic field. We study cases of hydrogen band and helium band wave propagation, rising-tone emissions, packets with amplitude modulations, and ducted waves. We analyze the wave propagation properties in the time domain, enabling comparison with in situ observations. We show that cold plasma density gradients can keep the wave vector quasiparallel, guide the wave energy efficiently, and have a profound effect on mode conversion and reflections. The wave normal angle of unducted waves increases rapidly with latitude, resulting in reflection on the ion hybrid frequency, which prohibits propagation to low altitudes. The modeled wave fields can serve as an input for test-particle analysis of scattering and precipitation of relativistic electrons and energetic ions.
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来源期刊
Frontiers in Astronomy and Space Sciences
Frontiers in Astronomy and Space Sciences ASTRONOMY & ASTROPHYSICS-
CiteScore
3.40
自引率
13.30%
发文量
363
审稿时长
14 weeks
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