本项目将综合利用电离层和磁层卫星联合地磁台网观测数据，研究不同波段电离层电磁离子回旋波（EMIC波）的空间（地磁纬度和磁地方时）分布及其随季节、太阳和地磁活动的变化特性，旨在找出电离层EMIC波的发生率和空间分布的主要控制因素，分析电离层参数对EMIC波的传播（包括从磁层向电离层的传播和电离层水平面传播）的影响，揭示EMIC波的空间传播特性。这对于深入认识磁层-电离层耦合系统中的小尺度结构，揭示该系统中物理现象的产生机制具有关键性的重要学术意义。

The project aims at disclosing the spatial distribution and propagation feature of ionospheric electromagnetic ion cyclotron waves (EMIC waves). Observations of the ionosphere and magnetosphere satellite combined with ground-based network are used for investigation. Details include: (1) studying the spatial (magnetic local time and latitude) distribution of EMIC waves in different bands and their variations with season, solar and magnetic activities; (2) disclosing the main controlling factors of the occurrence and spatial distribution of ionospheric EMIC wave; (3) analyzing the effect of ionospheric parameters on the propagation of EMIC waves from the magnetosphere to the ionosphere; (4) investigating the effect of ionospheric parameters (i.e. electron density) on the ionospheric ducting process of EMIC wave. The study is essential for understanding the small-scale structure in the magnetosphere-ionosphere coupling system, and revealing the mechanism of the physical phenomena in the system.