Collaborative Research: Remote Sensing of Electron Density Using Auroral Radio Emissions

该项目将研究无线电波在磁层与电离层的电磁耦合中的作用。 特别是，它将研究极光嘶嘶声和中频爆发（MFB），这是对磁亚暴开始的迅速反应，出现在极光区。除了与亚暴发生有关外，极光无线电发射还与一些其他极光现象有关，如向极移动的弧和无线电波吸收的增加。 该项目将使用实验测量与理论和数值分析相结合。 该项目的一个重要部分将是测量MFB事件的全波形和精细结构。 将在多个研究中心针对多个事件进行波形测量。 在某些情况下，将有可能使用非相干散射雷达数据来确定电离层内影响波的传播和散射的等离子体密度结构。 MFB事件的统计分析，结合共轭卫星测量，将用于确定与事件相关的电子沉淀的性质。 理论和数值分析将决定朗缪尔波和Z模波是否能够解释模式转换过程，而模式转换过程需要解释中频爆发的产生。磁层-电离层耦合和磁亚暴已经被确定为我们理解近地空间等离子体的核心问题。 本计画将探讨极光嘶嘶声与中频波爆发在M-I耦合中所扮演的角色。 研究生和本科生都将参与该项目的各个方面的研究，包括波浪测量仪器的开发，仪器的部署，从仪器获得的数据的分析以及相关的等离子体理论。 大部分研究将在达特茅斯学院进行，并将通过达特茅斯妇女科学计划（WISP）为一年级和二年级的妇女提供参与研究的机会。

This project will investigate the role of radio waves in the electromagnetic coupling of the magnetosphere to the ionosphere. In particular it will examine auroral hiss and medium frequency bursts (MFB), which appear in the auroral zones as a prompt response to the onset of a magnetic substorm. In addition to the association with substorm onset, auroral radio emissions are associated with a number of other auroral phenomena, such as poleward-moving arcs and increases in radio wave absorption. The project will use a combination of experimental measurement and theoretical and numerical analysis. An important part of the project will be the measurement of full waveforms and fine structure in MFB events. The waveform measurements will be performed at multiple sites and for multiple events. In some cases it will be possible to use incoherent scatter radar data to determine the plasma density structures within the ionosphere that affect the propagation and dispersion of the waves. Statistical analysis of MFB events, in conjunction with conjugate satellite measurements, will be used to determine the nature of electron precipitation associated with the events. The theoretical and numerical analyses will determine whether or not Langmuir and Z-mode waves can explain the mode conversion processes need to explain the generation of medium frequency bursts.Magnetosphere-ionosphere coupling and magnetic substorms have been identified as central problems to our understanding of near-earth space plasmas. This project will examine the role that auroral hiss and medium frequency wave bursts play in M-I coupling. Both graduate and undergraduate students will participate in this project in all aspects of the research, including the development of wave measurement instruments, the deployment of the instruments, the analysis of the data obtained from the instruments and the related plasma theory. The majority of the research will take place at Dartmouth College and will offer opportunities for first and second year women to participate in the research through the Dartmouth Women-in-Science Program (WISP).