Phase coherence of foreshock MHD waves: wavelet analysis

Details Phase coherence of foreshock MHD waves: wavelet analysis Phase coherence of foreshock MHD waves: wavelet analysis

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ssrv..107..495k&link_type=abstract

Space Science Reviews, v. 107, Issue 1, p. 495-498 (2003).

Physics

8

Mhd Turbulence, Phase Coherence, Wavelet Analysis

Scientific paper

The earth's foreshock is a region where particularly large amplitude MHD waves are commonly observed. They exhibit various waveforms, suggesting that nonlinear interaction between the waves is in progress. In a previous paper (Hada et al., 2003) we have introduced a method to quantitatively evaluate the strength of phase coherence among the waves from a given time series data. Here we further develop our method by applying wavelet filtering technique. From the analysis it was found that, although the turbulence is consisted of waves with a wide range of plasma rest frame frequencies, only those frequencies lower than the ion gyrofrequency are responsible for generating the phase coherence.

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