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GEM: Experimental Identification of Plasma Wave Modes in Vicinity of Kelvin-Helmholtz (KH) Vortices and in Plasma 'Mixing' Regions in Low Latitude Boundary Layer

GEM：开尔文-亥姆霍兹 (KH) 涡旋附近和低纬度边界层等离子体“混合”区域中等离子体波模式的实验识别

基本信息

批准号：
1707521
负责人：
Katariina Nykyri
金额：
$ 30.98万
依托单位：
Embry-Riddle Aeronautical University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1707521&HistoricalAwards=false
关键词：
GEM Experimental Identification Plasma Wave

项目摘要

This project focuses on understanding the dynamics of the boundary between the solar wind and the Earth's magnetic field. The interactions between electromagnetic waves and charged particles that result in heating of the particles is a universal process, but the near-Earth space is currently the only plasma physics laboratory where the physics can be studied with in-situ measurements in naturally existing scales. Examining this problem in the magnetosphere will provide insight into the solar coronal heating problem. This can benefit the larger space- and astrophysics community beyond the immediate field of magnetospheric physics. The PI is a tenured female physics professor and the project will fund and involve ERAU undergraduate students in summer research program and fund a female Ph.D student, for 3 years. In order to enhance understanding of the origin of the cross-scale non-adiabatic ion and electron heating at the Low Latitude Boundary Layer (LLBL) from magnetohydrodynamics (MHD) to ion to electron scales, plasma waves will be identified above ion cyclotron frequency extending to electron scales. These will be examined during 'mixed' intervals with and without simultaneous Kelvin Helmholtz (KH) activity, and study the possible free sources of energy in particle distributions, and in microscopic electron and ion velocity gradients that can for the first time be resolved with the data from Magnetosphere Multi-Scale (MMS) mission. The objectives of this proposal are to address what the observed higher frequency waves in the LLBL are, what their characteristics and relation to ambient plasma conditions are, and what their role is in ion and electron heating. While the proposed work addresses the micro-scale physics, which is currently neglected in global MHD codes, it will help understand the interdependence between fluid scale KH and kinetic scale waves as well as how these kinetic scale waves modify the ambient plasma properties. The ambient plasma properties are crucial in determining the reconnection efficiency and solar wind-magnetosphere coupling. The study is therefore highly relevant for understanding the physics that needs to be taken into account for developing better global space weather and magnetospheric models.

该项目的重点是了解太阳风和地球磁场之间边界的动态。电磁波和带电粒子之间的相互作用导致粒子加热是一个普遍的过程，但近地空间是目前唯一的等离子体物理实验室，可以在自然存在的尺度上进行现场测量。在磁层中研究这个问题将有助于深入了解太阳日冕加热问题。这可以使磁层物理学直接领域以外的更大的空间和天体物理学界受益。PI是一位终身女物理学教授，该项目将资助ERAU本科生参加暑期研究计划，并资助一名女博士生，为期3年。为了加深对低纬边界层（LLBL）跨尺度非绝热离子和电子加热的起源从磁流体力学（MHD）到离子到电子尺度的理解，将在离子回旋频率以上识别等离子体波，扩展到电子尺度。这些将在有和没有同时开尔文-亥姆霍兹（KH）活动的“混合”间隔期间进行检查，并研究粒子分布中可能的自由能量源，以及首次可以用磁层多尺度（MMS）使命的数据解决的微观电子和离子速度梯度。本提案的目标是解决LLBL中观察到的高频波是什么，它们的特性和与周围等离子体条件的关系是什么，以及它们在离子和电子加热中的作用是什么。虽然拟议的工作解决了微尺度物理，这是目前被忽视的全球MHD代码，它将有助于理解流体尺度KH和动力尺度波之间的相互依赖关系，以及这些动力尺度波如何修改周围的等离子体特性。环境等离子体的性质是决定重联效率和太阳风磁层耦合的关键。因此，这项研究对于了解为开发更好的全球空间气象和磁层模型而需要考虑的物理学具有高度相关性。

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Kelvin-Helmholtz Instability Associated With Reconnection and Ultra Low Frequency Waves at the Ground: A Case Study

DOI：
10.3389/fphy.2021.738988
发表时间：
2021-12
期刊：
影响因子：
0
作者：
E. Kronberg;J. Gorman;K. Nykyri;A. G. Smirnov;J. Gjerloev;E. Grigorenko;L. Kozak;X. Ma;K. Trattner;M. Friel
通讯作者：
E. Kronberg;J. Gorman;K. Nykyri;A. G. Smirnov;J. Gjerloev;E. Grigorenko;L. Kozak;X. Ma;K. Trattner;M. Friel

Ion Dynamics in the Meso-scale 3-D Kelvin–Helmholtz Instability: Perspectives From Test Particle Simulations

中观尺度 3-D 开尔文亥姆霍兹不稳定性中的离子动力学：来自测试粒子模拟的视角

DOI：
10.3389/fspas.2021.758442
发表时间：
2021
期刊：
Frontiers in Astronomy and Space Sciences
影响因子：
3
作者：
Ma, Xuanye;Delamere, Peter;Nykyri, Katariina;Burkholder, Brandon;Eriksson, Stefan;Liou, Yu-Lun
通讯作者：
Liou, Yu-Lun

Characteristics of Kelvin–Helmholtz Waves as Observed by the MMS From September 2015 to March 2020