Wavelet analysis of magnetic turbulence in the Earth's plasma sheet
Abstract
Recent studies provide evidence for the multi-scale nature of magnetic turbulence in the plasma sheet. Wavelet methods represent modern time series analysis techniques suitable for the description of statistical characteristics of multi-scale turbulence. Cluster FGM (fluxgate magnetometer) magnetic field high-resolution (~67 Hz) measurements are studied during an interval in which the spacecraft are in the plasma sheet. As Cluster passes through different plasma regions, physical processes exhibit non-steady properties on magnetohydrodynamic (MHD) and small, possibly kinetic scales. As a consequence, the implementation of wavelet-based techniques becomes complicated due to the statistically transitory properties of magnetic fluctuations and finite size effects. Using a supervised multi-scale technique which allows existence test of moments, the robustness of higher-order statistics is investigated. On this basis the properties of magnetic turbulence are investigated for changing thickness of the plasma sheet.
Keywords
Cite
@article{arxiv.physics/0410073,
title = {Wavelet analysis of magnetic turbulence in the Earth's plasma sheet},
author = {W. Baumjohann and R. Nakamura and A. Runov and M. Volwerk and T. L. Zhang and A. Balogh},
journal= {arXiv preprint arXiv:physics/0410073},
year = {2016}
}
Comments
17 pages, 5 figures