Low Frequency MHD Waves in the Magnetosheath-Magnetopause

磁鞘磁顶中的低频 MHD 波

• 批准号: 9714068
• 负责人: Chio Cheng
• 金额: $ 5万
• 依托单位: Department of Energy, Princeton Plasma Physics Laboratory
• 依托单位国家: 美国
• 项目类别: Interagency Agreement
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-02-01 至 1999-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9714068&HistoricalAwards=false
• 关键词: Low; Frequency; MHD; Waves; Magnetosheath

This proposal addresses issues pertaining to low-frequency MHD wave generation and propagation in the magnetosheath-magnetopause region. This is a theoretical investigation focused on the conditions in the magnetosheath region during periods of quasi-perpendicular bow shocks. Four interrelated topics will be considered: (a) MHD wave activity in the magnetosheath; (b) field-line resonance and mode conversion (to kinetic Alfven waves (KAWs) at the magnetopause; (c) comparison of theoretically predicted wave properties and spectra with observations in the magnetosheath and mangetopause; (d) time-dependent patchy reconnection and transport driven by KAWs. Analytical work, supported by numerics where needed, rather than full numerical simulations, is envisaged, using a kinetic MHD model developed by the PI. In this model, the plasma is treated in terms of a cold core component and a hot component that is described kinetically.

该提案涉及有关低频磁流体动力学波的产生和传播的磁鞘磁层顶区域的问题。 这是一个理论研究的磁鞘区期间准垂直弓冲击的条件。 将审议四个相互关联的专题：（a）磁鞘中的磁流体动力学波活动;（B）磁层顶的场线共振和模式转换（向动力阿尔芬波转换）;（c）理论预测的波的特性和频谱与磁鞘和磁层顶观测的比较;（d）动力阿尔芬波驱动的时间相关的斑片重联和输运。 分析工作，在需要的地方，而不是完整的数值模拟，支持，设想使用PI开发的动力学MHD模型。 在这个模型中，等离子体被处理的冷芯组件和热组件，是动力学描述。