Charged Particle Acceleration in Solar Eruptive Events

太阳爆发事件中的带电粒子加速

• 批准号: 2275807
• 金额: --
• 依托单位: University of St Andrews
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2275807
• 关键词: Charged; Particle; Acceleration; Solar; Eruptive

Understanding the mechanisms for the generation of the large number of non-thermal accelerated particles observed in solar flares is currently one of the most interesting unsolved problems in solar physics. The energy for powering solar eruptive events fundamentally comes from the coronal magnetic field and its release involves magnetic reconnection. A variety of particle acceleration mechanisms have been associated with the process of magnetic reconnection. While the parallel electric field generated during magnetic reconnection is an obvious potential mechanism for particle acceleration, there is some doubt whether it can account for the number of high-energy particles observed due to the very limited size of the non-ideal reconnection regions. Mechanisms linked to the reconnection outflow region have been studied for a couple of decades, so far with somewhat inconclusive results for acceleration on macroscopic scales, but have recently have gained more attention for operating on smaller scales. In this PhD project various previously unstudied aspects of particle acceleration mechanisms in reconnection outflow regions will be explored. In particular, it is planned that the project will focus on the differences between 2D and 3D models. The project will mainly use test particle calculations as a tool. The project is mainly theoretical in nature, but where possible comparison with observations will be made.The PhD student will take part in the Solar and Magnetospheric Theory Group's Guide Reading Programme which runs for 3 months at the start of her PhD. This programme includes some transferable skills training (coding in Fortran and using LaTeX etc). She will also be attending the group seminar and the applied mathematics seminar, both of which run weekly during term time. She will have the opportunity to take courses (delivered by video link) with the Scottish Mathematical Sciences Training Centre (SMSTC) or with the Scottish Universities Physics Alliance (SUPA). The student will also have the opportunity to enrol in transferable skills course offered by the University of St Andrews via its CAPOD and GRADSkills units.

理解在太阳耀斑中观察到的大量非热加速粒子的产生机制是目前太阳物理学中最有趣的悬而未决的问题之一。驱动太阳喷发事件的能量基本上来自日冕磁场，它的释放涉及到磁场的重新连接。各种粒子加速机制都与磁重联的过程有关。虽然在磁场重联过程中产生的平行电场是粒子加速的一种明显的潜在机制，但由于非理想重联区域的尺寸非常有限，它是否能解释观察到的高能粒子的数量仍存在一些疑问。与重联流出区相关的机制已经被研究了几十年，到目前为止，关于宏观尺度上的加速的结果还不是很确定，但最近因为在较小的尺度上运行而获得了更多的关注。在这个PHD项目中，将探索重联流出区中粒子加速机制的各种以前未被研究的方面。特别是，计划该项目将侧重于2D和3D模型之间的差异。该项目将主要使用测试粒子计算作为工具。该项目主要是理论性质的，但在可能的情况下，将与观测进行比较。博士生将参加太阳和磁层理论小组的指南阅读计划，该计划在博士开始时为期3个月。该方案包括一些可转让的技能培训(用Fortran编码和使用LaTeX等)。她还将参加小组研讨会和应用数学研讨会，这两个研讨会在学期期间每周举行一次。她将有机会参加苏格兰数学科学培训中心(SMSTC)或苏格兰大学物理联盟(SUPA)的课程(通过视频链接)。学生还将有机会参加由圣安德鲁斯大学通过其CAPOD和GRADSkills单元提供的可转让技能课程。