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

近年来，随着社会对太空卫星的依赖，辐射带内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)及其在地面上的特征的项目。这个项目的时机恰到好处，可以支持NASA的范艾伦探测器任务。它将支持一位刚刚开始其职业生涯的年轻科学家的工作。辐射带粒子在与EMIC波的相互作用中可能会被加热、散射和丢失。研究人员将研究波的传播特性作为地磁活动和辐射带动力学的函数。由于对波的地面观测比卫星观测容易得多，成本也低得多，因此能够从地面研究它们将是非常有用的。他们将使用来自太空的GOES和THEMIS磁场数据以及来自南极地面的共轭数据来解决三个问题：1)在磁暴的每个阶段，空间和地面上的EMIC波的相对出现情况是什么？为什么在风暴的某些阶段(主要阶段和恢复阶段)没有在地面上观察到一些波，尽管它们是在太空中观察到的？重离子He和O对辐射带降水损失和EMIC传播到电离层有何贡献？来自LANL和THEMIS航天器的等离子体数据将加强这项统计研究。最后，他们将与PPPL没有资金的合作者一起，后者将使用二维有限元代码进行海浪模拟研究。研究的这一部分将研究重离子对波的衰减。

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.