项目名称: 日冕物质抛射及其驱动激波的三维演化
项目编号: No.11473070
项目类型: 面上项目
立项/批准年度: 2015
项目学科: 天文学、地球科学
项目作者: 封莉
作者单位: 中国科学院紫金山天文台
项目金额: 95万元
中文摘要: 日冕物质抛射(CME)一直是太阳物理界的研究热点。对于空间天气来说,它也是大的地磁暴的主要来源。本项目将利用新的高时间空间分辨,大视场的卫星数据,结合理论研究和数值模拟,在以下几个方面对CME及其驱动的激波进行深入的研究:(1)利用多个卫星的多点remote-sensing和in-situ观测,研究CME在行星际空间的三维传播和形态演化,其中包括CME的基本物理量质量的演化及演化涉及的物理和几何过程;(2)Stealth CME是一类特殊的CME,由于其不具备一般CME源区伴随的耀斑、暗条、暗区等现象,我们将研究和总结其源区特征;(3)利用Tomography的方法获得CME的内部三维密度分布;(4)利用紫外和白光图像,射电type II和局地观测,研究CME驱动激波的三维形态演化和激波sheath的形成。
中文关键词: 日冕物质抛射;激波;三维重构;太阳磁场
英文摘要: Coronal Mass Ejection (CME) is a hot topic in solar physics. It is also known as the main cause of major geomagnetic storms. Taking advantages of high spatial and temporary resolution, larger field-of-view observations from various instruments, this proposal has four scientific objectives which can deepen our understandings in the three-dimensional (3D) evolution of a CME and its preceding shock. (1) 3D evolution of CMEs in interplanetary space derived from multi-viewpoint remote-sensing and in-situ observations and MHD simulations.We will also study the physical and geometrical processes in the evolution of the CME mass, a fundmental parameter of a CME.(2) The characteristic properties of the source region of stealth CMEs, which lack the usually accompaning features with a CME,e.g., flares, filaments and dimming regions, etc. (3) The internal 3D density distribution within a CME cloud with the tomographic technique based on multi-viewpoint observations.(4) 3D evolution of CME-driven shock and the formation of shock sheath. The investigated data include the EUV and white-light imaging, radio typeII emissions and in-situ observations.
英文关键词: Coronal mass ejections;Shocks;3D reconstructions;solar magnetic field