On the nature of particle energization via resonant wave-particle interaction in the inhomogeneous magnetospheric plasma
On the nature of particle energization via resonant wave-particle interaction in the inhomogeneous magnetospheric plasma
复制标题
关于非均匀磁层等离子体中共振波粒相互作用的粒子供能性质
DOI：
10.5194/angeo-29-1179-2011
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发表时间：
2011
影响因子：
1.9
通讯作者：
D. Shklyar
中科院分区：
文献类型：
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作者：
D. Shklyar
当非均匀磁等离子体中传播的准单色波具有足够大的振幅时，存在相位俘获共振粒子，其能量的增加或减少取决于非均匀性的"符号"。这种粒子的能量密度的变化可以大大超过波的能量密度，这违背了能量守恒的普遍假设下，波作为能源或汇。我们发现，实际上，相俘获粒子的能量增加（或减少）与能量转移（到）相未俘获粒子，而波基本上介导的过程。这种理解的实质重要性在于对可达到的粒子能量设置适当的定量约束。这些结果对磁层物理学中的至少两个基本问题，即辐射带中的粒子动力学和哨声触发的发射，有直接的应用。
When a quasi-monochromatic wave propagating in an inhomogeneous magnetoplasma has sufficiently large amplitude, there exist phase-trapped resonant particles whose energy increases or decreases depending on the "sign" of inhomogeneity. The variation of energy density of such particles can greatly exceed the wave energy density which contradicts energy conservation under the prevalent assumption that the wave serves as the energy source or sink. We show that, in fact, the energy increase (or decrease) of phase-trapped particles is related to energy transfer from (to) phase untrapped particles, while the wave basically mediates the energization process. Virtual importance of this comprehension consists in setting proper quantitative constraints on attainable particle energy. The results have immediate applications to at least two fundamental problems in the magnetospheric physics, i.e. particle dynamics in the radiation belts and whistler-triggered emissions.