非相对论的缓变型太阳质子事件与太阳耀斑和日冕物质抛射关系的研究

项目名称： 非相对论的缓变型太阳质子事件与太阳耀斑和日冕物质抛射关系的研究

项目编号： No.41474166

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： 乐贵明

作者单位： 国家卫星气象中心

项目金额： 90万元

中文摘要： 太阳耀斑和日冕物质抛射(CME)爆发后太阳高能粒子强度快速增加和缓慢变化过程分别称为太阳高能粒子事件的脉冲相和缓变相。通过研究耀斑和CME与脉冲相非相对论质子积分或微分通量的相关性，分析太阳高能粒子事件早期非相对论质子可能的主要加速机制。通过分析GOES卫星观测到的缓变相质子通量和谱指数的变化以及相应的CME在L1点形成的激波强度和法向特征并对驱动激波的ICME进行磁云重构，然后与CME初始特征进行比对来分析与GOES卫星磁链接的行星际激波面位置和强度的变化。选择合适的扩散方程，使得扩散方程能准确地拟合耀斑和CME爆发时的初始粒子注入源导致的高能粒子事件的脉冲相和缓变相。把观测到的太阳高能粒子事件的缓变相减去扩散方程拟合的缓变相就得到行星际激波对非相对论质子通量的定量贡献。通过对每一种太阳质子事件时间强度剖面对应的CME特征进行统计分析，研究CME的什么参数决定着太阳质子事件时间强度剖面。

中文关键词： 太阳耀斑；日冕物质抛射；行星际激波；太阳高能粒子

英文摘要： The period over which the flux of solar energetic particle (SEP) increases conspicuously is called prompt component (PC) of the SEP event or the impulsive phase of the SEP event, while the period over which the flux of SEP increases or decreases gradually is defined as the gradual component (GC) or gradual phase of the SEP event in this paper. The calculation of the correlation between the flares/CMEs and the integral or differential flux of the non-relativistic protons with different energy for PC can provide some clues of the possible acceleration mechanisms for the non-relativistic protons with different energy at the early phase of a SEP event. By anakyzing the variation in the integral or differential flux of the non-relativistic protons with different energy, and the variation of the spectra index duing gradual phase and the the intensity, and the normal direction of the shock driven by interplanetary mass ejection in the near-Earth interplanetary space, and the Grad-Shafranov reconstruction of magnetic clouds for the ICME, and then compare with the properties of the CME to obtain the dynamic information of the location and intensity of the shock, which magnetically connected with the GOES satellite.If the solution of a diffusion equation can agree well with the real observation of the SEP event when the injected particle source was only caused by the associated flare and CME, this kind of diffusion equation will be selected to simulate the impulsive pahse and the primary gradual phase of the SEP event caused only by the associated solar flare and CME. The difference between the observed gradual phase and the simulated primary gradual phaseis the real contribution made by interplanetary shock to the non-relativistic proton's intensity. Statistical analysis of CME features corresponding to each kind type of intensity-time profile solar proton event may help us would produce the key parameters that define the CME time-intensity pattern of a gradual solar proton event.

英文关键词： Solar flare;coronal mass ejection;interplanetary shock;solar energetic particle