Collaborative Research: GEM: Plasma Transport from the Solar Wind to the Inner Magnetosphere
合作研究:GEM:从太阳风到内磁层的等离子体传输
基本信息
- 批准号:0602903
- 负责人:
- 金额:$ 13万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2006
- 资助国家:美国
- 起止时间:2006-08-15 至 2010-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This project will investigate the physical processes that lead to the transport of solar wind ions from the magnetosheath and into the magnetosphere to form the plasma sheet. Ion distributions in the magnetosheath, tail lobes, tail flanks, and plasma sheet will thus be characterized for different Interplanetary Magnetic Field (IMF) and solar wind conditions. The study will address whether the transport of solar wind ions into the magnetosphere from different locations supply sufficient particles of different energies needed to form the quiescent and storm-time plasma sheet. The effect of changes in the solar wind population on the variance in the plasma sheet will also be examined. The approach will be to develop and use kinetic simulations to study the relevant particle transport processes and to compare the simulation results with published observations from satellites such from Geotail, International Sun-Earth Explorer (ISEE), Active Magnetospheric Particle Tracer Explorers (AMPTE), and Defense Meteorological Satellite Program (DMSP). The model will follow the full particle motion or (where appropriate) the guiding-center drifts of solar-wind ions from the magnetosheath into the magnetosphere. In the magnetosheath, the model will use an analytical magnetic field that reproduces quite well the shape of magnetosheath field lines obtained from gas-dynamic calculations. The magnetosheath electric field is proportional to the cross product of the solar-wind velocity and the magnetic field. Especially for southward IMF, the magnetosheath's magnetic field lines will reconnect with initially closed magnetospheric field lines. The magnetospheric model will use the magnetically and electrically self-consistent Rice Convection Model (RCM-E) with a magnetic field boundary condition that includes the effect of a non-uniform penetration magnetic field. This magnetospheric model maintains internal force balance between the magnetospheric plasma and magnetic field. Use of the RCM-E will allow the calculation of self-consistent distributions of particle flux, plasma pressure, and current density within the magnetosphere (including the tail flanks and plasma sheet). The evolution of the distributions in response to varying solar wind conditions will be studied, and the simulation results will be compared with observations. A significant outcome of this work will be a physical understanding of the relationship between properties of the solar-wind plasma (e.g., velocity and density) and the resulting plasma sheet, which is the main source for the ring current. This would provide a currently missing link for characterizing magnetic storms (and eventually accounting for variations of particle population in the inner magnetosphere) from solar-wind properties and IMF conditions. Such an achievement would be beneficial for understanding and forecasting space weather, and thus for society. A significant portion of the funds for this project are dedicated to support the research training of a UCLA graduate student.
该项目将研究导致太阳风离子从磁鞘传输到磁层形成等离子体片的物理过程。因此,磁鞘、尾叶、尾翼和等离子体片中的离子分布将针对不同的行星际磁场(IMF)和太阳风条件进行表征。该研究将解决太阳风离子从不同位置传输到磁气层是否提供了形成静止和风暴时等离子体片所需的足够的不同能量的粒子。还将检查太阳风数量的变化对等离子体片变化的影响。该方法将开发和使用动力学模拟来研究相关的粒子输运过程,并将模拟结果与来自 Geotail、国际日地探测器 (ISEE)、主动磁层粒子示踪探测器 (AMPTE) 和国防气象卫星计划 (DMSP) 等卫星的已发表观测结果进行比较。该模型将跟踪完整的粒子运动或(在适当的情况下)太阳风离子从磁鞘到磁层的引导中心漂移。在磁鞘中,该模型将使用分析磁场,该磁场可以很好地再现从气体动力学计算中获得的磁鞘场线的形状。磁鞘电场与太阳风速度和磁场的叉积成正比。特别是对于南向IMF,磁鞘的磁力线将与最初闭合的磁层磁力线重新连接。磁层模型将使用磁电自洽莱斯对流模型 (RCM-E),其磁场边界条件包括非均匀穿透磁场的影响。该磁层模型保持磁层等离子体和磁场之间的内力平衡。使用 RCM-E 将允许计算磁层(包括尾翼和等离子体片)内的粒子通量、等离子体压力和电流密度的自洽分布。将研究分布随不同太阳风条件的演变,并将模拟结果与观测结果进行比较。这项工作的一个重要成果将是对太阳风等离子体特性(例如速度和密度)与所产生的等离子体片之间关系的物理理解,等离子体片是环形电流的主要来源。这将为根据太阳风特性和 IMF 条件表征磁暴(并最终解释内磁层中粒子数量的变化)提供目前缺失的环节。这样的成就将有利于理解和预测空间天气,从而有利于社会。该项目的很大一部分资金专门用于支持加州大学洛杉矶分校研究生的研究培训。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Lawrence Lyons其他文献
Transphobia as SymptomFear of the “Unwoman”
跨性别恐惧症症状对“非女性”的恐惧
- DOI:
10.1215/23289252-4189874 - 发表时间:
2017 - 期刊:
- 影响因子:0.9
- 作者:
Patricia M. Elliot;Lawrence Lyons - 通讯作者:
Lawrence Lyons
Lawrence Lyons的其他文献
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{{ truncateString('Lawrence Lyons', 18)}}的其他基金
Collaborative Research: Flow Channel Control of Substorm Expansion Phase Spatial Coverage and Duration
合作研究:亚暴扩展阶段空间覆盖范围和持续时间的流道控制
- 批准号:
2055192 - 财政年份:2021
- 资助金额:
$ 13万 - 项目类别:
Continuing Grant
Collaborative Research: Supersubstorms--Their Driving and Responses in the Magnetosphere, Ionosphere, and Thermosphere
合作研究:超级亚暴——它们在磁层、电离层和热层中的驱动和响应
- 批准号:
1907483 - 财政年份:2019
- 资助金额:
$ 13万 - 项目类别:
Standard Grant
Collaborative Research: Coordinated Radar and Optical Analysis of Flow Channel Disturbances within the Nightside Auroral Oval/Plasma Sheet
合作研究:协调雷达和光学分析夜侧极光卵形/等离子体片内的流道扰动
- 批准号:
1401822 - 财政年份:2015
- 资助金额:
$ 13万 - 项目类别:
Continuing Grant
Collaborative Research: PFISR Ion-Neutral Observations in the Thermosphere (PINOT)
合作研究:PFISR 热层离子中性观测 (PINOT)
- 批准号:
1242356 - 财政年份:2012
- 资助金额:
$ 13万 - 项目类别:
Continuing Grant
CEDAR: Incoherent Scatter Radar (ISR) Measurements of Flow Bursts and Relations to Auroral Electrodynamics
CEDAR:流爆发的非相干散射雷达 (ISR) 测量及其与极光电动力学的关系
- 批准号:
1042255 - 财政年份:2011
- 资助金额:
$ 13万 - 项目类别:
Continuing Grant
Collaborative Research: GEM--Asymmetric Entry and Transport of Magnetospheric Plasma During Periods of Northward Interplanetary Magnetic Field
合作研究:GEM--北行行星际磁场期间磁层等离子体的不对称进入和输运
- 批准号:
1003876 - 财政年份:2010
- 资助金额:
$ 13万 - 项目类别:
Continuing Grant
CEDAR: AMISR Measurements of Auroral Disturbance Electrodynamics, Including Relations to Harang Reversal and Large-Scale Convection Evolution
CEDAR:极光扰动电动力学的 AMISR 测量,包括与哈朗反转和大规模对流演化的关系
- 批准号:
0639312 - 财政年份:2007
- 资助金额:
$ 13万 - 项目类别:
Continuing Grant
Triggered Large-scale Auroral Disturbances and Poleward Boundary Intensifications (PBIs): Polar Lonospheric Convection Evolution and Structure
引发的大规模极光扰动和极地边界增强(PBI):极地孤层对流演化和结构
- 批准号:
0646233 - 财政年份:2007
- 资助金额:
$ 13万 - 项目类别:
Continuing Grant
Triggered Large-scale Auroral Disturbances and PBIs: Polar Ionospheric Convection Evolution and Structure
引发的大规模极光扰动和PBI:极地电离层对流演化和结构
- 批准号:
0611717 - 财政年份:2006
- 资助金额:
$ 13万 - 项目类别:
Continuing Grant
Spatial and Temporal Dynamics of Important Types of Geomagnetic Disturbance
重要类型地磁扰动的时空动力学
- 批准号:
0136139 - 财政年份:2002
- 资助金额:
$ 13万 - 项目类别:
Continuing Grant
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相似海外基金
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合作研究:GEM:磁层和电离层中电磁离子回旋波的传播和耗散
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2247396 - 财政年份:2024
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