Theoretical and Observational Studies of the Ionosphere- Plasmasphere-Ring Current System

电离层-等离子体层-环流系统的理论与观测研究

• 批准号: 9711381
• 负责人: Janet Kozyra
• 金额: $ 36.5万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-01 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9711381&HistoricalAwards=false
• 关键词: Theoretical; Observational; Studies; Ionosphere; Plasmasphere

This project continues studying the transport and deposition of energy in the ring current and underlying ionosphere, including (1) the contribution of magnetotail currents to the Dst index, (2) the importance of superdense plasma sheets to the formation of the most intense ring currents, (3) the relationship between energy input into the inner magnetosphere and upstream solar wind density, (4) the physical processes producing intense midlatitude ion precipitation during large magnetic storms, and the role of this precipitation in ring current decay, (5) the association between stretched magnetic field lines, violation of the first adiabatic invariant and intense subauroral ion precipitation during major storms, (6) the effects of outflow at the dayside magnetopause on ring current energy balance during the main phases of large storms, (7) the impact of electromagnetic ion cyclotron wave interactions in producing precipitation loss from the ring current, redistributing energy between ring current ion species and channeling ring current energy into the thermal populations of the inner magnetosphere, and (8) the major sources and sinks of suprathermal ion populations in the inner magnetosphere, their distribution in L value and local time, their relationship to magnetic storms and to the heating of thermal ions during disturbed conditions. The PI will investigate these fundamental physical processes, emphasizing the coupling of ring current energy into the underlying ionosphere by heat and particle fluxes, and the affect of changing solar wind and magnetospheric conditions on this coupling.

这个项目继续研究环电流和电离层中的能量输送和沉积，包括(1)磁尾电流对DST指数的贡献，(2)超高密度等离子体片对形成最强烈的环电流的重要性，(3)输入到内部磁层的能量与上游太阳风密度的关系，(4)在大磁暴期间产生强烈的中纬度离子降水的物理过程，以及这种降水在环电流衰减中的作用，(5)伸展的磁力线之间的联系，破坏第一绝热不变量和大风暴期间强烈的亚极光离子降水，(6)日侧磁层顶流出对大风暴主要阶段环流能量平衡的影响，(7)电磁离子回旋波相互作用在环流产生降水损失中的影响，环流离子与环流能量向内磁层热粒子的再分配，(8)内磁层过热离子粒子的主要源和汇，它们在L值和当地时间的分布，它们与磁暴和扰动条件下热离子的加热的关系。PI将研究这些基本的物理过程，重点是环电流能量通过热通量和粒子通量耦合到底层电离层，以及变化的太阳风和磁层条件对这种耦合的影响。