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.

近年来，随着社会对空间卫星的依赖，辐射带中带电粒子的动力学已成为一个日益重要的科学问题。这是一个研究空间中的电磁离子回旋波（EMIC）及其地面特征的项目。这个项目是很好的时机，以支持美国宇航局货车艾伦探测器使命。它将支持一个刚刚开始职业生涯的年轻科学家的工作。辐射带粒子可以在与EMIC波的相互作用中被加热、散射和丢失。调查人员将研究作为地磁活动和辐射带动态函数的波的传播特性。由于地面观测电波比卫星观测更容易和便宜，因此能够从地面研究电波将非常有用。他们将使用GOES和THEMIS的空间磁场数据沿着南极地面的共轭数据来解决三个问题：在磁暴的每个阶段，EMIC波在空间和地面上的相对发生率是多少？2.）的情况。为什么有些波在风暴的某些阶段（主要和恢复）没有在地面上观察到，尽管它们在太空中被观察到？3.）第三章重离子He+和O+如何影响辐射带降水损失和EMIC向电离层的传播？这一统计研究将得到LANL和THEMIS航天器等离子体数据的补充。 最后，他们将与PPPL的无资金合作者一起使用二维有限元代码进行波浪模拟研究。这部分的研究将探讨重离子对波的衰减。