Solar Wind-Magnetosphere-Ionosphere Coupling Using Incoherent Scatter, Magnetometer, and Other Coordinated Data

使用非相干散射、磁力计和其他协调数据进行太阳风-磁层-电离层耦合

• 批准号: 9412390
• 负责人: Vladimir Papitashvili
• 金额: $ 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: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-04-15 至 1997-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9412390&HistoricalAwards=false
• 关键词: Solar; Wind; Magnetosphere; Ionosphere; Coupling

This proposal requests support for a three year effort to investigate the electrodynamic coupling between the solar wind, the Earth's magnetosphere, and the ionosphere. Investigations focus upon the high latitude polar cap and the region around the polar cleft. In open models of the magnetosphere, the cleft is the dayside boundary between open and closed geomagnetic field lines. There is considerable evidence that, within the cleft region, the effects of the full range of solar wind - magnetosphere - ionosphere coupling phenomena can be observed, including: Birkeland currents, strong electric fields and plasma drifts, rapid motions of small scale field-aligned current structures, particle energization within localized regions, intense ionospheric heating, etc. The proposed research is directed toward investigations of the cleft and its dynamic behavior in response to variations in the solar wind and interplanetary magnetic field (IMF). Fundamental questions center around the identification of ionospheric signatures of phenomena which occur at the magnetopause or magnetospheric boundary layer and which relate to solar wind - magnetosphere interactions. Processes such as reconnection, the Kelvin-Helmholtz instability, impulsive plasma penetration, the magnetopause response to dynamic pressure variations or sudden changes in IMF orientation all produce dynamic variations which couple electrically to the conducting ionosphere via field-aligned currents. It is propose to undertake a variety of incoherent scatter radar observations and the coordinated analysis of these data with combinations of magnetometer array data, a variety of satellite data, as well as data from other Greenland ground instruments such as the imaging riometer, all sky camera, etc. to investigate both large scale and small scale high latitude electrodynamic phenomena which are thought to be associated with the coupling of energy and momentum from the solar wind to the magnetosphere and ionosph ere.

该提案要求支持一项为期三年的研究太阳风、地球磁层和电离层之间电动力学耦合的努力。调查的重点是高纬度极帽和极裂周围地区。在磁层的开放模型中，裂缝是开放和封闭地磁力线之间的日侧边界。大量证据表明，在裂缝区域内，可以观察到太阳风-磁层-电离层耦合现象的影响，包括：Birkeland电流、强电场和等离子体漂移、小尺度场向电流结构的快速运动、局部区域内的粒子带电、电离层的强烈加热等。提出的研究方向是研究裂缝及其响应太阳风和行星际磁场变化的动力学行为。基本问题集中在磁层顶或磁层边界层发生的现象的电离层特征的识别上，这些现象与太阳风-磁层相互作用有关。诸如重联、开尔文-亥姆霍兹不稳定性、脉冲等离子体穿透、磁层顶对动态压力变化的响应或IMF方向的突然变化等过程都会产生动态变化，这些变化通过场向电流与导电电离层电偶联。建议进行各种非相干散射雷达观测，并结合磁力计阵列数据、各种卫星数据以及格陵兰岛其他地面仪器的数据，如成像测速仪、全天空照相机、等，以研究大尺度和小尺度高纬度电动力学现象，这些现象被认为与太阳风到磁层和电离层的能量和动量耦合有关。