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基于磁流体力学模拟的太阳高能粒子物理模式研究进展
Alternative TitleResearch Progress on the Solar Energetic Particle Model Based on Magnetohydrodynamic Simulation
魏稳稳; 沈芳; 左平兵
Department空间科学部
Source Publication天文学进展
2015
Volume33Issue:1Pages:1-26
ISSN1000-8349
Language中文
Keyword太阳高能粒子 激波 Mhd太阳风模式 行星际输运
Abstract太阳高能粒子(SEP)事件是一类重要的空间天气灾害性事件,其数值预报研究在空间天气预报研究中占有很重要的地位。SEP事件主要包括3种类型:与太阳耀斑爆发相关联的脉冲型事件,与日冕物质抛射驱动的激波相关联的缓变型事件,以及同时具有缓变型和脉冲型事件特征的混合型事件。其中,缓变型SEP事件持续时间较长并且高能粒子强度较大,对这类事件的模拟是当前研究的难点。目前针对缓变型SEP事件的模拟工作业已发展了多个理论和数值模型。每个模型都对SEP加速和传播的复杂过程作了基本的假设,这些模型的模拟结果能够部分重现观测到的SEP事件特征。而若要提高预报SEP事件的能力,则需要将描述三维日冕物质抛射驱动的激波模型与描述高能粒子在行星际空间中的加速和传输的模型耦合起来,建立基于接近真实的SEP加速和传播的三维太阳风背景模拟及以激波参数为输入的SEP模型。主要回顾了缓变型SEP事件中粒子的加速和传输方面的研究进展,以及可用于获取CME激波传播参数的磁流体力学太阳风模型研究现状;综述了缓变型SEP事件的激波-粒子模型(shock-and-particle model);最后对未来工作进行了讨论和展望。
Other AbstractSolar energetic particle (SEP) can destroy the spacecraft, and has great influence on human activities. Thus, it is of importance to forecast SEP events. SEP events can be divided by three general categories: impulsive SEP events, gradual SEP events and mixed SEP events. Impulsive SEP events, with characteristics of low intensity, short duration, and enhanced He-3, are correlated to solar flares. Gradual SEP events which become the main simulation branch of current research are related to coronal mass ejections (CMEs) and they usually have high flux in protons and last longer. Mixed SEP events maintain complex features of the former two kinds of events. Several theories and numerical models are applied to simulate gradual SEP events. Each model makes some assumptions to simplify the complex acceleration and transportation processes. No research to date has combined accurate shock evolution, particles injection and acceleration, with their interplanetary transport. In order to develop the physics-based SEP prediction model and improve the ability to forecast SEP events, it is necessary to self-consistently combine the magnetohydrodynamic (MHD) model that describes CME-driven shock propagation with particle model that simulates the acceleration and transportation processes of particles. In this paper, firstly, we review current models, which have been used to describe gradual SEP events and their applications. Generally, there are two major approaches to model gradual SEP events: some studies include the acceleration mechanisms of SEPs induced by CME-driven shocks, while others assume a fixed particle injecting source at the shock. In addition, some researchers also consider the effects of perpendicular diffusion on SEPs propagation in three-dimensional interplanetary magnetic fields. These models can partially reproduce the observed properties for SEP events. Then, we make a brief review of numerical MHD simulation models, such as Space Weather Modeling Frame (SWMF), CORonal and HELiospheric (CORHEL) model, Solar InterPlanetary-Conservative Element Solution Element (SIP-CESE) model, COronal INterplanetary (COIN) model. All these models can be used to workout the propagation parameters of CME and CME-driven shocks, which are expected to provide inputs to the particle model. Finally, some discussions of the future work about how to combine MHD and particle models are presented.
Indexed ByCSCD
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/4708
Collection空间科学部
Recommended Citation
GB/T 7714
魏稳稳,沈芳,左平兵. 基于磁流体力学模拟的太阳高能粒子物理模式研究进展[J]. 天文学进展,2015,33(1):1-26.
APA 魏稳稳,沈芳,&左平兵.(2015).基于磁流体力学模拟的太阳高能粒子物理模式研究进展.天文学进展,33(1),1-26.
MLA 魏稳稳,et al."基于磁流体力学模拟的太阳高能粒子物理模式研究进展".天文学进展 33.1(2015):1-26.
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