文章基本信息

标题：Spectral moments for the analysis of frequency shift, broadening, and wavevector anisotropy in a turbulent flow
本地全文：下载
作者：Y. Narita
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2017
卷号：69
期号：1
页码：73-82
DOI：10.1186/s40623-017-0658-7
出版社：Springer Verlag
摘要：Turbulence represents essentially random fluctuations that evolve both spatially and temporally, and appear in various geophysical and space science applications. A spectral moment method is proposed to characterize the turbulence energy spectra in the wavevector and frequency domain in the lowest-order sense. The frequency shift velocity and the random sweeping velocity are obtained from the first-order and second-order moments of the wavenumber–frequency spectra. The maximum extension direction and the elliptic spectral shape are obtained from the second-order moments of the wavevector spectra. The algorithm for the spectral moment computation is presented with synthetic energy spectra and solar wind energy spectra. Open image in new window Graphical abstract .
关键词：Turbulence energy spectra ; Moment calculation ; Random sweeping model