Magnetospheric Ultra-Low Frequency (ULF) Wave Power Distribution in Response to Interplanetary Geoeffective Structures

磁层超低频 (ULF) 波功率分布对行星际地球有效结构的响应

• 批准号: 0741841
• 负责人: Dimitrios Vassiliadis
• 金额: $ 27万
• 依托单位: Sarissa, Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-10-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0741841&HistoricalAwards=false
• 关键词: Magnetospheric; Ultra; Low; Frequency; ULF

Ultra-low frequency (ULF) waves play an important role in a variety of phenomena that affect the magnetosphere of the Earth. In particular, the waves are coupled to processes that affect the relativistic electrons in the radiation belts.This project will apply a superposed-epoch analysis to determine the statistical distribution of ULF wave power spectral density in the magnetosphere as a function of magnetic local time and the distance from the Earth. The wave power will be determined from ground-based measurements using arrays of magnetometers. The analysis will determine the wave growth and decay and will look specifically for the response of the ULF wave power to phenomena such as impacts of cornal mass ejections (CMEs) on the magnetosphere, high-speed solar wind streams, and ULF waves in the solar wind. The analysis will include various forms of filtering and nonlinear time-series analysis. The last part of the project will be to run magnetohydrodynamic (MHD) simulations to compare the ULF response from the simulations with what was determined from the data analysis.The research will include graduate and undergraduate students. The work has societal benefits because of the relevance of the work to space weather phenomena.

超低频（ULF）波在影响地球磁层的各种现象中发挥着重要作用。 特别是，这些波与影响辐射带中相对论电子的过程耦合。该项目将应用叠加历元分析来确定磁层中 ULF 波功率谱密度的统计分布，作为磁本地时间和距地球距离的函数。 波浪功率将通过使用磁力计阵列进行地面测量来确定。 该分析将确定波的增长和衰减，并将专门研究超低频波功率对磁层物质抛射（CME）、高速太阳风流和太阳风中超低频波等现象的响应。 分析将包括各种形式的滤波和非线性时间序列分析。 该项目的最后一部分将运行磁流体动力学 (MHD) 模拟，以将模拟的 ULF 响应与数据分析确定的结果进行比较。该研究将包括研究生和本科生。 由于这项工作与空间天气现象的相关性，这项工作具有社会效益。