Observations of Kolmogorov Turbulence in Saturn's Magnetosphere

被引：2

作者：

Xu, S. B. ^{[1
]}

Huang, S. Y. ^{[1
]}

Sahraoui, F. ^{[2
]}

Yuan, Z. G. ^{[1
]}

Wu, H. H. ^{[1
]}

Jiang, K. ^{[1
]}

Zhang, J. ^{[1
]}

Lin, R. T. ^{[1
]}

机构：

[1] Wuhan Univ, Sch Elect Informat, Hubei Luojia Lab, Wuhan, Peoples R China

[2] Sorbonne Univ, Ecole Polytech, Lab Phys Plasmas, CNRS,Paris Saclay Observ Paris Meudon, Palaiseau, France

来源：

GEOPHYSICAL RESEARCH LETTERS | 2023年 / 50卷 / 16期

基金：

中国国家自然科学基金;

关键词：

SOLAR-WIND; MAGNETIC-FIELD; MAGNETOHYDRODYNAMIC TURBULENCE; FLUCTUATIONS; DISSIPATION; EVOLUTION; FLUID; WAVES;

D O I：

10.1029/2023GL105463

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Kolmogorov scaling in the inertial range of scales is a distinct characteristic of fully developed turbulence, and studying it offers valuable insights into the evolution of turbulence. In this work, we perform a statistical survey of the power spectra with the Kolmogorov scaling in Saturn's magnetosphere using Cassini measurements. Two cases study show that both magnetic-field and electron density spectra exhibit f (-5/3) at the MHD scales. The statistical analysis reveals a wide-ranging and abundant presence of Kolmogorov spectra throughout magnetosphere, observed across all local times. Interestingly, the occurrence rate of these Kolmogorov-like events within Saturn's magnetosphere surpasses that observed in the planetary magnetosheath. The measurements of magnetic compressibility for the Kolmogorov-like events show the dominance of incompressible Alfvenic turbulence (44.64%) with respect to magnetosonic-like one (6.94%). In addition, the source and evolution of the turbulent fluctuations are further discussed.

引用

页数：11

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