Modeling of the Interaction Between the Convecting Polar Wind Plasma and Inverted-V Structures

对流极地风等离子体与倒 V 形结构之间相互作用的建模

• 批准号: 0003925
• 负责人: Supriya Banerjee
• 金额: $ 35.61万
• 依托单位: Leidos, Inc.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-05-01 至 2007-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0003925&HistoricalAwards=false
• 关键词: Modeling; Interaction; Between; Convecting; Polar

The investigators will study plasma structure, dynamics, and coupling resulting from the interaction of an inverted-V structure and a typical polar wind plasma during its transit through the auroral region. An important objective in ionosphere-magnetosphere coupling is to trace the flow of mass, energy, and momentum, on both small and large scales. In the auroral region, this coupling can be affected by the interaction of thermal and auroral plasmas, which can lead to plasma energization, and multi-scale plasma structures. A persistent signature in the auroral regions is an inverted-V structure in the precipitating electron spectral distribution. The interaction of the convecting polar wind with the inverted-V structures is likely to result in dramatic departures of the polar wind plasma transport properties, which are a key factor in defining ionosphere-magnetosphere coupling. The study will be based on a generalized, time-dependent, 16-moment, multi-species, multi-scale, field-aligned transport model capable of simulating mesoscale plasma outflow processes. The model will be used to quantify the role of an inverted-V structure in mesoscale plasma dynamics, plasma energization, density structures, and ionospheric plasma outflow. The model results will help to understand the most important physical processes influencing magnetosphere-ionosphere coupling.

研究人员将研究等离子体的结构，动力学和耦合所产生的倒V型结构和典型的极风等离子体在其通过极光区过境的相互作用。 电离层-磁层耦合的一个重要目标是在小尺度和大尺度上追踪质量、能量和动量的流动。 在极光区，这种耦合会受到热等离子体和极光等离子体相互作用的影响，这会导致等离子体振荡和多尺度等离子体结构。 极光区的一个持久特征是降水电子光谱分布中的倒V结构。 对流极风与倒V结构的相互作用可能导致极风等离子体输运特性的剧烈偏离，这是定义电离层-磁层耦合的关键因素。 该研究将基于一个能够模拟中尺度等离子体外流过程的广义、随时间变化、16阶矩、多物种、多尺度、场对准传输模型。 该模型将被用来量化中尺度等离子体动力学，等离子体湍流，密度结构和电离层等离子体外流的倒V结构的作用。 模式结果将有助于理解影响磁层-电离层耦合的最重要的物理过程。