Equations of Motion Near Cyclotron Resonance
Equations of Motion Near Cyclotron Resonance
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DOI：
10.3389/fspas.2022.910224
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
J. Albert;A. Artemyev;Wen Li;L. Gan;Q. Ma
中科院分区：
文献类型：
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作者：
J. Albert;A. Artemyev;Wen Li;L. Gan;Q. Ma
这项工作比较了几个版本的运动方程的测试粒子遇到回旋共振与一个单一的，场对准哨声模式波。陀螺平均洛伦兹方程产生广泛的相位捕获（PT）和“正相位聚束”的低俯仰角电子由大振幅波。近似允许的哈密顿描述被减少到一对共轭变量，它可以占PT以及相位聚束在中等桨距角，最近已被用来调查这一意想不到的basterness或在低桨距角。在这里，数值模拟使用洛伦兹方程和几个版本的哈密顿运动方程进行比较。在每种情况下，在低桨距角下发现类似的行为。
This work compares several versions of the equations of motion for a test particle encountering cyclotron resonance with a single, field-aligned whistler mode wave. The gyro-averaged Lorentz equation produces both widespread phase trapping (PT) and “positive phase bunching” of low pitch angle electrons by large amplitude waves. Approximations allow a Hamiltonian description to be reduced to a single pair of conjugate variables, which can account for PT as well as phase bunching at moderate pitch angle, and has recently been used to investigate this unexpected bahavior at low pitch angle. Here, numerical simulations using the Lorentz equation and several versions of Hamiltonian-based equations of motion are compared. Similar behavior at low pitch angle is found in each case.