冕环与开放场重联驱动太阳风起源的数值模拟研究

项目名称： 冕环与开放场重联驱动太阳风起源的数值模拟研究

项目编号： No.41304133

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 杨利平

作者单位： 北京大学

项目金额： 25万元

中文摘要： 太阳风起源问题是空间物理和空间探测的关键科学问题之一。已有模型大多假设太阳风是由光球经色球到日冕沿一恒定流管的稳态流动。基于新的观测结果, Fisk et al., (1999，2003)和Tu et al.,(2005a,b)提出了磁重联驱动的太阳风起源模型（以下分别称为FISK模型和TU模型），并引起广泛关注。最近我们对TU模型进行了数值模拟验证，发现超米粒水平对流引起的磁重联确实能够为初始外流提供所需的物质。在此基础上，对FISK模型的研究将有助于进一步认识磁重联驱动的太阳风起源模型。本项目拟在已建立的MHD数值模式基础上，数值研究FISK模型下太阳风的物质供应，波动激发对太阳风的贡献，和冕环参数对太阳风的影响；特别对比研究FISK模型和TU模型下太阳风起源的动因。预期明晰FISK模型太阳风外流发生和加速过程，揭示磁重联驱动太阳风起源的主导因素，加深对太阳风起源机制的认识。

中文关键词： 数值模拟；太阳风；磁重联；湍流；波动

英文摘要： The origin mechanism of solar wind remains as one of the key topic in the space physics and space exploration. Present models mostly assume that solar wind flows outward continuously from the photosphere through the chromosphere to the corona. According to new observational results, Fisk et al., (1999, 2003) and Tu et al., (2005a, b) proposed origin model as driven by magnetic reconnection (hereafter be shorted as FISK model and TU model). These origin models have attracted wide attention from the community. Recently, we conduct the numerical study on TU model, which shows that the magnetic reconnection as a result of supergranular advection indeed feeds the mass to the nascent solar wind. Based on this, the research about FISK model will further improve our understanding about the origin model as driven by reconnection. On the basis of a developed MHD numerical model, this project will numerically study under FISK model how the material of solar wind are supplyed, and how the waves as excited futher accelerate solar wind, and how parameters of coronal loop influence solar wind. In particular, this project will conduct a comparative study about the different dynamics between FISK model and TU model. The work results are expected to uncloud occurrence and acceleration process of solar wind outflow in FISK model,

英文关键词： numerical simulation；solar wind；magnetic reconnection；turbulence；wave