SHINE: Short-Wavelength Turbulence in the Solar Wind

闪耀：太阳风中的短波长湍流

• 批准号: 1460130
• 负责人: Stephen Gary
• 金额: $ 29.8万
• 依托单位: SPACE SCIENCE INSTITUTE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-04-15 至 2019-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1460130&HistoricalAwards=false
• 关键词: SHINE; Short; Wavelength; Turbulence; Solar

This award is expected to yield improved understanding of turbulence not only in the interplanetary medium, but also in the solar corona, through interplanetary and interstellar space, and to astrophysical plasmas throughout the Universe. The project will combine theoretical investigations, numerical simulations, and data analysis of spacecraft observations, contributing to the solar wind models along with similar efforts from other research teams. The expected research results will be broadly disseminated through conference presentations and publications in peer-reviewed journals; making them fully accessible to the international scientific community. Public talks to audiences such as high school students will be given in order to convey specific project results in the context of general space science education. The project will involve a junior postdoctoral researcher supporting the NSF Strategic Goals in discovery, learning, diversity, and interdisciplinary research.The main thrust of this SHINE project is to study fundamental properties of the short-wavelength turbulence in the solar wind, including processes by which fluctuating energy is transferred among various possible turbulence fields, as well as address the energy dissipation from those fluctuations into the heating of solar wind plasma. The primary goal of this research project is to obtain a comprehensive plasma physics description of the solar wind turbulence in observed frequencies above 0.5Hz, which correspond to the short-wavelength fluctuations of the order of or less than the proton inertial length. For such fluctuations, velocity-space processes are essential for understanding the physics of the solar wind plasma. The project team will use both hybrid and particle-in-cell simulation techniques to pursue theoretical and computational aspects of the research. The proposed observational studies will utilize data from several different spacecraft flying in the near-Earth's space, and these data will be closely related to the diagnostics of the numerical simulations.

这一奖项预计将不仅提高对行星际介质中的湍流的理解，而且还将通过星际和星际空间以及整个宇宙的天体物理等离子体来加深对太阳日冕中的湍流的理解。该项目将结合理论研究、数值模拟和航天器观测的数据分析，与其他研究团队的类似努力一起为太阳风模型做出贡献。预期的研究成果将通过会议发言和同行评议期刊上的出版物广泛传播；使国际科学界能够充分了解这些成果。将向高中生等受众进行公开演讲，以便在一般空间科学教育的背景下传达具体的项目成果。该项目将包括一名初级博士后研究员，以支持NSF在发现、学习、多样性和跨学科研究方面的战略目标。这一SHISH项目的主要目的是研究太阳风中短波长湍流的基本特性，包括波动能量在各种可能的湍流场之间转移的过程，以及解决从这些波动到太阳风等离子体加热的能量耗散。这项研究的主要目标是获得太阳风湍流在0.5赫兹以上观测频率的全面等离子体物理描述，该频率对应于小于或等于质子惯性长度数量级的短波长涨落。对于这样的波动，速度-空间过程对于理解太阳风等离子体的物理是必不可少的。该项目团队将同时使用混合和细胞内粒子模拟技术来进行理论和计算方面的研究。拟议的观测研究将利用在近地空间飞行的几个不同航天器的数据，这些数据将与数值模拟的诊断密切相关。