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

超低频波在影响地球磁层的各种现象中起着重要作用。特别是，这些波与影响辐射带中相对论性电子的过程耦合在一起。本项目将采用叠历元分析，确定极低频波功率谱密度在磁层中的统计分布，作为磁地方时和与地球距离的函数。海浪的能量将由地面测量的磁力计阵列来确定。分析将确定波的增长和衰减，并将特别关注极低频波功率对磁层日冕物质抛射（cme）的影响、高速太阳风流和太阳风中的极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是运行磁流体动力学（MHD）模拟，将模拟的ULF响应与数据分析确定的ULF响应进行比较。这项研究将包括研究生和本科生。这项工作具有社会效益，因为这项工作与空间天气现象有关。

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.