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
• 负责人: Lawrence Lyons
• 金额: $ 45万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-02-01 至 2012-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0646233&HistoricalAwards=false
• 关键词: Triggered; Large; scale; Auroral; Disturbances

In order to understand and predict geomagnetic disturbances, it is necessary to identify the different types of disturbances, how they relate to their ultimate energy source in the solar wind, and what the physical processes are that cause the different disturbance types. Different types of large-scale disturbances are related to different types of discontinuities of the solar wind plasma and interplanetary magnetic field (IMF), and to the resulting changes in plasma flows in the polar-cap ionosphere. This project will be directed toward firmly establishing the relationships between solar wind and IMF changes, the manifestation of these changes in reconnection related ionospheric flows on the dayside, and the resulting types of auroral-zone disturbances. We will also initiate a thorough study of how the solar wind and IMF changes and the auroral-zone disturbances are related to the formation and decay of the nightside Harang electric field reversal. It is particularly timely to now study the relationships between solar wind plasma and IMF changes, polar-cap and Harang region ionospheric flows, and the development of the different types of auroral disturbances because of recent instrument deployments, as well as the recent development and availability of improved techniques for mapping the measurements of the solar wind and IMF conditions made by spacecraft to the point where the interaction with the Earth's magnetosphere takes place. New SuperDARN radars have recently been installed that for the first time will allow good coverage of the Harang region and its evolution with respect to dayside convection, and all-sky imagers are being deployed throughout the Canadian Arctic that will give unprecedented ground coverage of the Canadian portion of the auroral oval. The goal of this research is to take advantage of this unprecedented opportunity to concretely determine the relations between the IMF and solar wind dynamic pressure Pdyn changes, dayside polar-cap convection and Harang region convection, and major disturbances of the magnetosphere-ionosphere system. The project will involve graduate student research, a postdoctoral researcher and a young woman scientist. It will also promote research partnerships between UCLA and the collaborative university, non-profit, and international organizations responsible for the operations of the various instruments and observational data sets that will be used.

为了理解和预测地磁扰动，有必要确定不同类型的扰动，它们与太阳风中的最终能量来源的关系，以及导致不同扰动类型的物理过程。 不同类型的大尺度扰动与太阳风等离子体和行星际磁场（IMF）的不同类型的不连续性有关，并与极冠电离层中等离子体流的变化有关。 该项目将致力于确定太阳风和国际货币基金组织变化之间的关系，这些变化在与白昼电离层流动有关的重联中的表现，以及由此产生的极光区扰动类型。 我们还将开始一个彻底的研究，太阳风和IMF的变化和极光区的扰动是如何与夜面哈朗电场逆转的形成和衰减。现在研究太阳风等离子体与国际货币基金组织变化、极冠和哈朗地区电离层流动之间的关系，以及由于最近的仪器部署而产生的不同类型的极光扰动之间的关系，以及最近开发和提供了改进的技术，用于绘制航天器对太阳风和国际货币基金组织条件的测量结果，使其达到与太阳风和国际货币基金组织相互作用的程度。地球的磁层。 最近安装了新的SuperDARN雷达，首次能够很好地覆盖哈朗地区及其在昼侧对流方面的演变，在整个加拿大北极地区部署了全天空成像仪，这将对极光椭圆的加拿大部分提供前所未有的地面覆盖。本研究的目标是利用这一前所未有的机会，具体确定IMF和太阳风动压Pdyn变化，昼侧极帽对流和Harang区域对流，磁层电离层系统的主要扰动之间的关系。该项目将涉及研究生研究、一名博士后研究员和一名年轻女科学家。 它还将促进加州大学洛杉矶分校与合作大学、非营利组织和负责各种仪器和观测数据集操作的国际组织之间的研究伙伴关系。