磁云与背景太阳风磁重联过程研究

This project mainly focuses on magnetic reconnection phenomenon in interplanetary space. The research objectives of this project are magnetic clouds and the background solar wind. Detailed study of magnetic reconnection processes between magnetic clouds and the background solar wind， using numerical simulation combined with the theoretical analysis of observational data methods. Here we will analyze the types, the processes and mechanisms of magnetic reconnection occurring. Explore the role of magnetic reconnection in the evolution of magnetic clouds.The results of the project would initially identify the physical properties and structure images of magnetic reconnection structure of the outside boundary layers of magnetic clouds. The project is expected to reveal: (1)The structural features of reconnection outside boundary layers of magnetic clouds; (2)What kind of impact can the magnetic reconnection have on the structures of magnetic clouds. Some of the project's research results provide an important significance for understanding the evolution of the magnetic clouds in interplanetary space. The project is designed to help us understand the structure of the magnetic clouds as they move away from the Sun. It is also provide a scientific basis for the establishment of the correct theoretical model of magnetic clouds.

针对行星际磁重联问题，以磁云和背景太阳风为研究对象，采用数值模拟和理论分析观测资料相结合方法，具体研究磁云与背景太阳风之间磁场重联过程，分析此过程中磁重联发生的方式、过程和机理，探究磁重联在磁云演化过程中的角色。项目预期将揭示:(1)初步确定磁云外边界层的磁重联物理特性和结构图像；(2)磁重联对磁云的结构有何影响。项目的研究成果对于理解磁云在行星际空间的演化具有重要意义。有助于了解磁云离开太阳后的结构，为建立正确的磁云理论模型提供科学依据。

本项目的主要研究目的是揭示磁云与背景太阳风之间磁场重联过程的特征和影响。另外，近地磁尾离子惯性尺度上多点重联过程也被研究。我们开展了三项具体研究工作：研究磁云与背景太阳风磁重联过程；研究太阳风重联耗散区膨胀过程；研究磁尾小尺度等离子体团结构。主要研究成果包括：（1）磁云边界层的磁重联过程对磁云磁通量能产生剥离作用。（2）重联产生的热流喷射注入到背景太阳风介质中时，会在远离重联点的耗散区中发生膨胀。（3）磁层亚暴期间，多点磁重联在磁尾变薄的电流片中发生并产生多个等离子体团，其中霍尔效应扮演重要角色。