Understanding Storm-Time Electromagnetic Ion Cyclotron (EMIC) Wave Occurrences and Their Relationship to Ground Signatures

了解风暴期间电磁离子回旋加速器 (EMIC) 波的发生及其与地面特征的关系

• 批准号: 1338221
• 负责人: Hyomin Kim
• 金额: $ 23.58万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-15 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1338221&HistoricalAwards=false
• 关键词: Understanding; Storm; Time; Electromagnetic; Ion

The dynamics of the charged particles in the radiation belts has become an increasingly important science problem is recent years as society has become dependent on satellites in space. This is a project to investigate electromagnetic ion cyclotron waves (EMIC) in the space and their signatures on the ground. This project is well timed to support the NASA Van Allen Probes mission. It will support the work of a young scientist just starting his career.Radiation belt particles can be heated, scattered and lost in their interaction with EMIC waves. The investigators will study the propagation characteristics of the waves as a function of geomagnetic activity and radiation belt dynamics. Since ground observations of the waves are much easier and cheaper than satellite observations being able to study them from the ground would be very useful. They will use GOES and THEMIS magnetic field data from space along with conjugate data from the ground in Antarctica to address three questions: 1.) What is the relative occurrence of EMIC waves both in space and on the ground during each phase of a magnetic storm? 2.) Why are some of the waves not observed on the ground during certain phases (main and recovery) of the storm even though they are observed in space? 3.) How do heavy ions, He+ and O+, contribute to radiation belt precipitation losses and EMIC propagation to the ionosphere? This statistical study will be augmented by plasma data from LANL and THEMIS spacecraft. Finally they will join with unfunded collaborators at PPPL who will carry out wave simulation studies using a two-dimensional finite element code. This part of the study will investigate attenuation of the waves by heavy ions.

辐射带中带电颗粒的动力学已成为一个越来越重要的科学问题，这是近年来社会依赖太空中的卫星。这是一个研究空间中的电磁离子回旋波（EMIC）及其在地面上的签名的项目。该项目的时机非常适合支持NASA VAN ALLEN调查任务。它将支持一位年轻科学家的工作，刚开始他的职业生涯。放射皮带颗粒可以在与emic波的互动中加热，分散和丢失。研究人员将研究波的传播特征，这是地磁活性和辐射带动力学的函数。由于对波浪的地面观察比能够从地面研究的卫星观察值要容易得多，而且便宜。他们将使用goes和themis磁场数据以及来自南极洲地面的共轭数据来解决三个问题：1。）在磁性风暴的每个阶段，EMIC波在太空和地面上的相对出现是什么？ 2.）为什么在风暴的某些阶段（主要和恢复）中，即使在太空中观察到它们的某些阶段（主要和恢复），为什么在地面上观察到其中的一些波？ 3.）重离子（HE+和O+）如何促进辐射带降水损失和对电离层的EMIC繁殖？这项统计研究将通过LANL和THEMIS航天器的血浆数据来增强。 最后，他们将与PPPL的无资金合作者一起加入，他将使用二维有限元代码进行波浪模拟研究。研究的这一部分将调查重离子对波浪的衰减。