脉冲型太阳高能粒子事件中的粒子加速和传播研究

项目名称： 脉冲型太阳高能粒子事件中的粒子加速和传播研究

项目编号： No.41474148

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： 王玲华

作者单位： 北京大学

项目金额： 100万元

中文摘要： 脉冲型太阳高能粒子事件持续时间短（几十分钟－几小时），主要由～1-100 keV 电子组成，并富含低能氦3离子。这类高能粒子事件是在太阳大气中发生的最频繁的粒子加速事件，为我们理解宇宙中普遍发生的粒子加速、逃逸和传播过程的物理本质提供了宝贵的机会。太阳高能电子还可能对空间中的卫星仪器和宇航员造成危害。但是脉冲型太阳高能粒子事件的源区位置和加速机制现在还不清楚。本项目将利用WIND、ACE和STEREO飞船的观测，分析脉冲型太阳高能粒子事件随时间、空间和能量的变化，揭示这类事件中电子的特性和离子的特性的关联；完善高能粒子传播的数值模拟模型，探寻脉冲型太阳高能粒子的加速源区；检验以往的粒子加速机制，建立脉冲型太阳高能粒子事件的自洽加速图像。

中文关键词： 太阳高能粒子事件；粒子加速；太阳爆发；数据分析；数值模拟

英文摘要： Impulsive solar energetic particle (SEP) events last for <~ hours, and are dominated by ~1-100 keV electrons and low-energy ion emissions with enhanced 3He/4He ratios up to 104 times the coronal values. Impulsive SEPs appear to be one of the most common types of particle acceleration by the Sun, providing important clues to understand the physics of the particle acceleration, escape and transport in the universe. Impulsive solar energetic electrons can also cause radiation damage to spacecraft, instruments and astronauts in space. But the source region and acceleration mechanism of impulsive SEPs are not well understood yet. This proposal aims to provide a comprehensive understanding of impulsive SEPs. Using the measurements from WIND, ACE and STEREO, first, we will examine the statistical properties of impulsive SEPs and their variation in time, space and energy, to reveal the relation between the characteristics of electrons and ions in these events. Secondly, we will improve the present Monte Carlo simulation of particle transport, to explore the source region of impulsive SEPs. Finally, we propose to compare the particle intensity and spectrum predicted by the theories with the results inferred from transport simulation, and construct a self-consistent acceleration scenario of impulsive SEPs.

英文关键词： Solar Energetic Particle Events;Particle Acceleration;Solar Eruptive Events;Data Analysis;Numerical Simulation