Abstract
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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References
Hada, T., Koga, D. and Yamamoto, E.: 2003, ‘Phase Coherence of MHD Waves in the Solar Wind’, Space Sci. Rev. this issue.
Farge, M.: 1992, ‘Wavelet Transforms and Their Application to Turbulence’, Ann. Rev. Fluid Mech. 24, 395.
Torrence, C. and Compo, G. P.: 1998, ‘A Practical Guide to Wavelet Analysis’, Bull. Amer. Meteor. Soc. 79, 61.
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© 2003 Springer Science+Business Media Dordrecht
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Koga, D., Hada, T. (2003). Phase Coherence of Foreshock MHD Waves: Wavelet Analysis. In: Chian, A.CL., et al. Advances in Space Environment Research. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1069-6_48
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DOI: https://doi.org/10.1007/978-94-007-1069-6_48
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-3781-5
Online ISBN: 978-94-007-1069-6
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