磁场湍流是行星际和行星空间环境中常见而又复杂的扰动现象，其伴随着电磁场与等离子体状态的变化，并能引起能量的转移与转化，因而一直是空间物理研究的热点与难点。行星际日冕物质抛射（ICME）携带磁场湍流并在传播过程中发生演化，对ICME边界处磁场与等离子体状态有显著调制作用，也成为空间天气研究关注的重要问题。由于ICME的快速传播，以往很难对同一ICME沿（近似）同一径向多点观测。目前对ICME所携带的磁场湍流的研究多集中在1AU处，较少涉及传播演化问题。近些年欧美多次行星探测获得了高质量观测数据，提供了很好的研究契机。本项目将利用水、金、地、火四颗行星轨道处的联合观测，分析不同轨道处ICME所携带的磁场湍流的特征，归纳功率谱密度随径向距离的变化，并定量描述其径向演化规律。预期研究结果还将加深对行星空间天气效应的理解，并为我国火星探测的相关科学目标的设定提供科学依据。

The magnetic turbulence, which is accompanied by the variations of the electromagnetic field and the plasma properties, is a common and complicated phenomenon in the planetary and interplanetary space environment. It plays an important role in the energy transfer and conversion. Thus, the magnetic turbulence is always a hot and difficult topic in space physics research. The magnetic turbulence carried by the interplanetary coronal mass ejection (ICME) is an important topic in the space weather research, because of its strong modulation of the magnetic field and plasma properties in the boundary of the ICME. However, it is difficult to study an ICME from multi-position along one radial direction owing to its high propagating speed. Until now, the study of the magnetic turbulence carried by the ICME is mostly constrained at 1 AU and the radial evolution is rarely concerned. Recently, high quality observation data obtained by many planetary explorations from NASA and ESA provides a great opportunity to study the radial evolution of the magnetic turbulence carried by the ICME. This project, utilizing the joint observations from the orbit of Mercury, Venus, Earth, and Mars, focuses on studying the magnetic turbulence carried by the ICME at different distances along a rough radial direction to get the radial evolution law of the power spectral density of magnetic turbulence. Finally, a proper function will be addressed to describe the radial evolution of the power spectral density of the magnetic turbulence quantitatively. This project will help us to deepen the understand of the planetary space weather effectiveness and provide scientific basis to the relevant scientific goal setting of Chinese Mars exploration.