NSWP: Sustained Sub-auroral Storm Electric Fields: Polarization or Minimum Dissipation?

NSWP：持续的亚极光风暴电场：极化还是最小耗散？

• 批准号: 0720114
• 负责人: Brian Anderson
• 金额: --
• 依托单位: Johns Hopkins University
• 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: 2007-09-01 至 2012-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0720114&HistoricalAwards=false
• 关键词: NSWP; Sustained; Sub; auroral; Storm

This is a three year research project to use data from the new SuperDARN radar at Wallops Island, as well as DMSP and Iridium satellite data to investigate and elicit the origins of what is known as Subauroral Polarization Streams (SAPS). The overarching science question is related to magnetosphere-ionosphere coupling, that is whether the ionosphere passively responds to the situation in the magnetosphere or whether the ionosphere should be considered as more tightly coupled to the magnetosphere so that it influences the whole magnetosphere-ionosphere response to the solar wind drivers. Specific science goals that will be addressed include 1) Quantifying the dawn-dusk asymmetry in the return flow including its variation with IMF clock angle; 2) Quantifying the asymmetry in intensity and latitude of particle precipitation and its relationship to: the return flow intensity, the Birkeland currents, and the IMF clock angle; 3) Determining whether inner magnetospheric convection including ring current physics can account for the observed distributions of flows and Birkeland currents or whether MHD physics without ion drift physics can account for the observed distribution of return flows. The intellectual merit of this effort lies in significantly advancing our understanding of the storm-time Magnetosphere-Ionosphere system and the mid-latitude electrodynamics that occur during active times. This understanding is needed to advance the fundamental science understanding of geomagnetic storms but also has application to practical areas of importance such as communications and navigation for which strong ionospheric electric fields are of paramount concern. This project also continues an informal partnership between APL and the physics department at Augsburg College that consists in providing summer research opportunities for undergraduate students from Augsburg at APL via the JHU/APL Student Summer Internship program. M-I coupling during magnetic storms is one of the important physical processes that affect the upper atmospheric electrodynamics of the polar region. Thus, the research project will contribute to the larger research goals of the International Polar Year Program at NSF.

这是一个为期三年的研究项目，利用沃洛普斯岛新的SuperDARN雷达的数据，以及DMSP和铱卫星数据来调查和引出所谓的亚表层极化流（SAPS）的起源。首要的科学问题涉及磁层-电离层耦合，即电离层是否被动地对磁层的情况作出反应，或者是否应将电离层视为与磁层更紧密地耦合，从而影响整个磁层-电离层对太阳风驱动因素的反应。 具体的科学目标包括：1）定量的晨昏不对称的回流，包括其变化与IMF的时钟角; 2）定量的不对称的强度和纬度的粒子降水及其关系：回流强度，Birkeland电流，和IMF的时钟角;第三章确定包括环电流物理学在内的磁层内对流是否可以解释观测到的流动和Birkeland电流的分布，或者没有离子漂移物理学的MHD物理学是否可以解释观测到的回流的分布。这一努力的智力价值在于显着推进我们的理解风暴时的磁层电离层系统和中纬度电动力学发生在活跃时期。这一认识不仅对促进对地磁暴的基本科学认识是必要的，而且也适用于通信和导航等重要的实际领域，对这些领域来说，强电离层电场是最重要的问题。该项目还继续APL和奥格斯堡学院物理系之间的非正式合作关系，包括通过JHU/APL学生暑期实习计划为来自奥格斯堡的APL本科生提供暑期研究机会。 磁暴期间的M-I耦合是影响极区高层大气电动力学的重要物理过程之一。因此，该研究项目将为美国国家科学基金会国际极地年计划的更大研究目标做出贡献。