Simulation Studies of Plasmaspheric Plume Density Structure/Ion Composition and Plume Plasma Transport to Dayside Magnetopause and Polar Cap

等离子体球羽流密度结构/离子组成和羽流等离子体传输到白天磁层顶和极冠的模拟研究

• 批准号: 1248242
• 负责人: Jiannan Tu
• 金额: $ 31.04万
• 依托单位: University of Massachusetts Lowell
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-02-01 至 2017-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1248242&HistoricalAwards=false
• 关键词: Simulation; Studies; Plasmaspheric; Plume; Density

A plasmaspheric plume is a region of dense cold ionospheric plasma extending outward into the magnetosphere from the nominal location of the plasmapause. It has a limited width in azimuth. This study will use and improve the dynamic-fluid-kinetic-plasmasphere-ionosphere (DyFKPI) model. This model combines self-consistently a fluid based model of the ionosphere with a particle based model of the plasmasphere. It will be used to determine the density distributions of electrons and ions (H+, He+, and O+) along plume magnetic field lines and provide formulas that can be used to determine the density along the flux tube. The second part of this study will quantify the plasmaspheric plasma mass delivered to the dayside magnetospause as a function of magnetospheric activity. This research will investigate how plasmaspheric plumes deliver plasma to the polar cap and contribute to magnetospheric plasma circulation. IMAGE RPI data will be used in this study and compared with simulation derived density distributions. While the research is rather narrowly focused on the structure and impact of the plasma plumes the resulting formulas will be valuable in other studies of magnetospheric physics. The grant will support a graduate student.

等离子体层羽流是一个稠密的冷电离层等离子体区域，从等离子体层顶的标称位置向外延伸到磁层。它的方位角宽度有限。本研究将使用并改进动力-流体-动力-等离子体-电离层（DyFKPI）模型。该模型结合了自洽的电离层流体模型与粒子模型的等离子体。它将用于确定电子和离子（H+，He+和O+）沿着羽流磁场线的密度分布，并提供可用于确定沿着通量管的密度的公式。 本研究的第二部分将量化的等离子体层的等离子体质量交付到昼侧磁层顶的磁层活动的函数。这项研究将探讨等离子体层羽流如何将等离子体输送到极冠，并有助于磁层等离子体循环。 IMAGE RPI数据将用于本研究，并与模拟得出的密度分布进行比较。虽然研究范围相当狭窄，但所得到的公式对磁层物理的其他研究也有价值。 这笔补助金将资助一名研究生。