地球辐射带合声波的精细结构分析

合声波与辐射带电子的相互作用是影响辐射带电子演化的重要机制之一。在频率-时间谱上，合声波通常表现成一系列分立的上升调或下降调（持续时间约为0.1-1 s）。同时，这些分立结构的波包内还存在着持续时间更短（约为0.02-0.06 s）的子波包。合声波的精细结构不仅关系到其对电子的作用，也是探索其产生机制的线索和依据。关于上升调的精细结构研究已经取得了一些进展，然而还有众多不同形态的合声波精细结构未被报道，以及众多关于精细结构特性的相关性亟待发掘。本项目将基于范艾伦探测器的观测数据，分析各类型合声波的精细结构特性，揭示这些特性与背景等离子体环境的关系，并探讨其形成机制。

The interaction between chorus waves and radiation belt electrons is considered an important mechanism controlling the radiation belt dynamics. In the frequency-time spectrogram, chorus emissions often appear as a series of discrete elements (e.g., risers, fallers, and hooks with a duration of 0.1-1.0 s) . With a higher resolution, it can be identified that these elements consist of subpackets with a shorter duration of 0.02-0.06 s. Both the effect of chorus on the high energy electrons and the analysis of chorus generation mechanism rely on its fine structure. The fine structure of rising tones has earned considerable attention, but there are plentiful different types of chorus fine structure having not been reported and many correlations about their fine structure to be found. Basing on the observations of Van Allen Probes, we will analyze the fine structure characteristics of different types of chorus, reveal the correlations between these characteristics and the ambient plasma conditions, and discuss the generation mechanisms of chorus.