行星际阿尔芬波基本特性及演化特征研究

As a typical magnetohydrodynamic wave mode, Alfven waves are found to be ubiquitous in the solar wind. The Walen test is usually made to identify interplanetary Alfven waves. The conventional method has made some simplified assumptions in determining the de Hoffmann-Teller (HT) frame and background magnetic field, and sometimes can cause non-ignorable errors. To overcome such defects, we will develop and improve a new Walen test method, which is independent on the HT frame and background magnetic field, to identify Alfven waves and obtain wave properties more accurately. Based on this new method, we will re-evaluate the achieved statistical properties of interplanetary Alfven waves, and pay special attention to the properties not involved in previous works, such as the wave frequency and the polarization degree, aiming at obtaining more accurate understandings of fundamental properties of interplanetary Alfven waves. Furthermore, we will investigate their radial propagations and evolution characteristics on the basis of the joint observations of multiple satellites.

阿尔芬波是行星际空间一种主要的磁流体力学波模，是太阳风中常见的扰动形式之一。行星际阿尔芬波的判定需要进行Walen检验，传统方法在确定de Hoffmann-Teller（HT）坐标系和背景磁场时进行了简化假设，有时会导致误差过大，影响结果的可信度。为克服这些缺陷，本项目将发展完善不依赖HT坐标系和背景磁场的Walen检验新方法，更准确地判定阿尔芬波并获得相关波动特性。利用新的方法，重新审视、评估现有的阿尔芬波统计特性，特别关注前人工作缺失的频率和偏振度等信息，以获取对行星际阿尔芬波基本特性更全面的认识。在此基础上，利用多卫星联合观测，揭示行星际阿尔芬波径向传播过程和演化规律。

阿尔芬波是行星际空间一种主要的磁流体力学波模，是太阳风中常见的扰动形式之一。行星际阿尔芬波的判定需要进行Walen检验，传统方法在确定de Hoffmann-Teller（HT）坐标系和背景磁场时进行了简化假设，有时会导致误差过大，影响结果的可信度。为克服这些缺陷，本项目发展完善了一种不依赖HT坐标系和背景磁场的Walen检验新方法，更准确地判定阿尔芬波并获得相关波动特性。利用新的方法，重新审视、评估了现有的阿尔芬波统计特性，特别关注前人工作缺失的频率和偏振度等信息，获取了对行星际阿尔芬波基本特性更全面的认识。在此基础上，利用多卫星联合观测，揭示行星际阿尔芬波径向传播过程和演化规律，特别是对太阳风等离子体的加热效果。