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Transport Theory of Cosmic Rays with application to the acceleration of charged particles at interplanetary shock waves

宇宙射线输运理论及其在行星际冲击波中带电粒子加速的应用

基本信息

批准号：
184408987
负责人：
Dr. Alexander Dosch
金额：
--
依托单位：
Center for Space Plasma and Aeronomic Research (CSPAR)
依托单位国家：
德国
项目类别：
Research Fellowships
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2011-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/184408987?language=en
关键词：
Transport Theory Cosmic Rays application

项目摘要

The main aim of this proposal is the application of transport theories onto diffusive shock acceleration. Especially interplanetary shocks will be covered, e.g. CME – driven shocks, which build up owing to coronal mass ejections in the solar wind. Therewith it is possible to describe the energy spectrum of solar cosmic rays or SEP (Solar Energetic Particle) – Events. The process of diffusive shock acceleration can be understood as follows: Charged Particles gain energy while they are scattered back and forth across a shock front. On the one hand, this energy gain depends upon the parameters that characterize the shock, which is studied by shock models. The shock models developed at the University of Huntsville, Alabama, describe for instance CME – driven shocks realistically. Therefore it will be the aim of this proposal to combine these shock models with the transport theories and to calculate the maximum energy of the charged particles. On the other hand, the energy gain depends on the form of the diffusion coefficients. Furthermore, it will be the aim of this proposal to develop transport theories to describe the particle transport in astrophysical plasmas more realistically. Particularly, therefore magnetized plasmas will be investigated in which a magnetic background field is superposed by stochastic magnetic fields. In such plasmas the particle transport can be assumed as diffusive and is characterized by diffusion coefficients. Furthermore, shock models will be developed in this proposal. By comparing shock simulations with real shocks the shock parameters will be determined, which are necessary to describe diffusive shock acceleration.

本文的主要目的是将输运理论应用于扩散激波加速度。特别是行星际冲击，例如CME驱动的冲击，它是由太阳风中的日冕物质抛射而形成的。这样就有可能描述太阳宇宙射线或SEP（太阳高能粒子）事件的能谱。扩散性激波加速的过程可以理解为：带电粒子在激波前沿来回散射时获得能量。一方面，这种能量增益取决于表征激波的参数，这是通过激波模型研究的。例如，阿拉巴马州亨茨维尔大学开发的冲击模型可以真实地描述CME驱动的冲击。因此，将这些激波模型与输运理论结合起来计算带电粒子的最大能量将是本文的目标。另一方面，能量增益取决于扩散系数的形式。此外，发展输运理论以更真实地描述天体物理等离子体中的粒子输运将是本提案的目标。因此，特别地，磁化等离子体将被研究，其中磁场背景场是由随机磁场叠加。在这样的等离子体中，粒子的输运可以假定为扩散的，并以扩散系数来表征。此外，本文还将建立冲击模型。通过将模拟冲击与实际冲击进行比较，确定描述扩散冲击加速度所必需的冲击参数。