Development and Evolution of Kelvin-Helmholtz Waves in Earth's Magnetopause and Their Effects on Earth's Magnetosphere: In-situ Observations with MHD Simulations

地球磁层顶中开尔文-亥姆霍兹波的发展和演化及其对地球磁层的影响：MHD 模拟现场观测

• 批准号: 1305374
• 负责人: Eunjin Choi
• 金额: $ 32.86万
• 依托单位: University of Maryland Baltimore County
• 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: 2014-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1305374&HistoricalAwards=false
• 关键词: Development; Evolution; Kelvin; Helmholtz; Waves

The investigators will study the generation and evolution of the Kelvin-Helmholtz waves (KHW) at the dayside magnetopause and the low-latitude boundary layer (LLBL) of Earth's magnetosphere under variable solar wind conditions. The project includes studying the effects of the KHW on solar wind entry into the magnetosphere and their impact on the inner magnetosphere. The research will be based on a combination of global magnetosphere simulations and extensive and intensive analysis of KHW observations from spacecraft to explore the global distribution of the occurrence and characteristics of KHW over the surface of the magnetopause. Direct spatial and temporal observations of KHW under a variety of solar wind conditions are lacking, with the result that the generation, development, and impact of these magnetopause waves are far from being fully understood in geospace. Statistical studies of KHW including sufficient numbers of conjunctive observations using multiple spacecraft will provide direct spatial and temporal observations of the generation and evolution of KHW and the effect of KHW on plasma transport and the inner magnetosphere. The study will be enhanced by global magnetohydrodynamic simulations that are suitable for investigating large-scale physical processes and their evolution. The goal of the study is to better understand the physics of the Earth?s magnetopause and the response of the inner magnetosphere to solar wind inputs that reach the magnetopause. Understanding the generation and evolution of the KHW at the magnetopause will have a large impact not only on terrestrial magnetospheric physics, but also on other magnetized (Mercury, Jupiter, and Saturn) and unmagnetized (Mars and Venus) planetary interactions with the solar wind. The relationship between the ultra-low frequency waves observed in the inner magnetosphere and the KHW on the magnetospause and the importance and effectiveness of plasma transport facilitated by KHW into the plasma sheet and inner magnetosphere are important for better space weather forecasting. It will also have relevance to on-going studies of the radiation belt and ring current based on observations currently being made by NASA's Van Allen Probes.

研究人员将研究在太阳风变化条件下，地球磁层昼侧磁层顶和低纬度边界层开尔文-亥姆霍兹波（KHW）的产生和演变。该项目包括研究KHW对太阳风进入磁层的影响及其对内磁层的影响。这项研究将以全球磁层模拟和对航天器观测到的KHW进行广泛深入的分析相结合为基础，以探索KHW在磁层顶表面的发生和特征的全球分布。在各种太阳风条件下的KHW的直接空间和时间观测是缺乏的，其结果是，这些磁层顶波的产生，发展和影响在地球空间远未得到充分理解。对KHW的统计研究，包括使用多个航天器进行足够数量的联合观测，将为KHW的产生和演变以及KHW对等离子体传输和内磁层的影响提供直接的空间和时间观测。这项研究将通过适用于调查大规模物理过程及其演变的全球磁流体动力学模拟得到加强。 这项研究的目的是为了更好地了解地球的物理学。的磁层顶和内磁层的响应，到达磁层顶的太阳风输入。了解KHW在磁层顶的产生和演化不仅对地球磁层物理学有很大的影响，而且对其他磁化（水星，木星和土星）和非磁化（火星和金星）行星与太阳风的相互作用也有很大的影响。 内磁层中观察到的超低频波与磁层顶上的KHW之间的关系以及KHW促进等离子体传输到等离子体片和内磁层的重要性和有效性对于更好的空间天气预报非常重要。 它还将与正在进行的辐射带和环电流研究有关，这些研究是根据美国宇航局的货车艾伦探测器目前正在进行的观测结果进行的。