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.

该项目的重点是理解太阳风与地球磁场之间边界的动力学。电磁波与导致颗粒加热的带电颗粒之间的相互作用是一个通用过程，但是近地空间是目前唯一可以在自然现有量表中使用原位测量的物理学研究物理学的血浆物理实验室。在磁层中检查此问题将提供对太阳冠状加热问题的见解。这可以使更大的空间和天体物理学社区受益于磁层物理的直接领域。 PI是一名终身的女性物理教授，该项目将资助并涉及ERAU本科生参加夏季研究计划，并为女性博士学位学生提供3年的资助。为了增强对从磁含水流动力学（MHD）到离子到电子尺度的低纬度边界层（LLBL）在低纬度边界层（LLBL）处的跨尺度非绝热离子和电子加热的理解，将在上面的离子环体频率扩展到电子尺度上的离子环频率。这些将在“混合”间隔期间进行检查，在有或没有同时进行开尔文·赫尔姆霍尔兹（KH）活性，并研究粒子分布中可能的能量来源，以及在微观电子和离子速度梯度中，这些能源首次可以通过磁层多界（MMM）的数据来解决这些速度。该提案的目标是解决LLBL中观察到的较高频率波，它们与环境血浆条件的特征和关系以及它们在离子和电子加热中的作用。虽然提出的工作解决了当前在全球MHD代码中忽略的微型物理学，但它将有助于了解流体量表KH和动力学量表波之间的相互依赖性以及这些动力学量表如何改变环境等离子体的特性。环境等离子体特性对于确定重新连接效率和太阳能磁层耦合至关重要。因此，这项研究与理解需要考虑更好的全球空间天气和磁层模型需要考虑的物理学高度相关。

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