项目名称: 日球电流片对行星际扰动影响的模拟研究
项目编号: No.41504132
项目类型: 青年科学基金项目
立项/批准年度: 2016
项目学科: 天文学、地球科学
项目作者: 张嫚
作者单位: 中国科学院国家空间科学中心
项目金额: 20万元
中文摘要: 日冕物质抛射(Coronal Mass Ejection,CME)是太阳大气中频繁发生的最剧烈的爆发现象之一,行星际空间是CME吹袭地球空间的必经传输通道。行星际CME (Interplanetary CME, ICME)在传播过程中会和背景太阳风大尺度结构发生相互作用,比如日球层电流片(Heliospheric Current Sheet,HCS),这会影响ICME到达近地空间的强度和时间等。本项目结合观测输入,改进已有的三维异步并行MHD模式,参数化研究ICME行星际传播动力学过程,包括ICME的偏转以及HCS发生的能量转换,尝试找到不同传播方向及传播速度以及ICME质量等参数对传播过程的影响,分析这些因素对于ICME能否到达地球以及ICME到达地球时的强度所产生的影响,并且与卫星观测进行比较,为近地空间预报提供上游边界条件。
中文关键词: 日冕物质抛射;日球电流片;数值模拟;磁流体力学
英文摘要: Coronal mass ejections (CMEs) are large-scale eruption of plasma and magnetic field from the Sun. As it it propagates from the Sun through the earth, interplanetary space is a necessary channel. Interplanetary CME (ICME) will interact with large-scale structure of solar wind during their journey, such as Heliospheric Current Sheet (HCS). This can affect the magnitude and arriving time of a ICME at 1AU. This project will consider the observation and make a improvement of our three-dimensional magnetohydrodynamic model, giving a research on the evolution of ICME’s progress in the interplanetary space arguemently, the deflection and energy transformation of a ICME with HCS are also considered. We try to find the parameters such as initial direction and velocity and mass of a ICME can how to effect the ICME’s evolution in the interplanetary space to 1AU, then we will conclude a ICME can arrive at earth or not and predict the magnitude if the ICME arrive at earth. We also compare our results with spacecraft and provide boundary conditions for space-weather forecasting near earth.
英文关键词: coronal mass ejections;heliospheric current sheet ;numerical simulate;magnetohydrodynamic