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Cluster and Ace Observations of Phase Synchronization in Intermittent Magnetic Field Turbulence: a Comparative Study of Shocked and Unshocked Solar Wind : Volume 27, Issue 4 (14/04/2009)

By Chian, A. C.-l.

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Book Id: WPLBN0003981267
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: Cluster and Ace Observations of Phase Synchronization in Intermittent Magnetic Field Turbulence: a Comparative Study of Shocked and Unshocked Solar Wind : Volume 27, Issue 4 (14/04/2009)  
Author: Chian, A. C.-l.
Volume: Vol. 27, Issue 4
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Chian, A. C., & Miranda, R. A. (2009). Cluster and Ace Observations of Phase Synchronization in Intermittent Magnetic Field Turbulence: a Comparative Study of Shocked and Unshocked Solar Wind : Volume 27, Issue 4 (14/04/2009). Retrieved from http://www.ebooklibrary.org/


Description
Description: National Institute for Space Research (INPE) and World Institute for Space Environment Research (WISER), P.O. Box 515, São José dos Campos-SP 12227-010, Brazil. We apply two distinct nonlinear techniques, kurtosis and phase coherence index, to analyze the modulus of interplanetary magnetic field data |B| measured by Cluster and ACE spacecraft from 1 to 3 February 2002. High degree of phase synchronization is found across a wide range of time scales, from 1 s to 104 s, in the magnetic field fluctuations, both in the shocked solar wind upstream of Earth's bow shock and in the unshocked ambient solar wind at the L1 Lagrangian point. This is the first direct measurement of phase coherence in the ambient solar wind turbulence. We show that phase synchronization related to nonlinear multiscale interactions is the origin of the departure from Gaussianity in the intermittent magnetic field turbulence. In particular, we demonstrate that at small scales near the spectral break the intermittency level of Cluster is lower than ACE, which may be a signature of the reflected ions from the shock.

Summary
Cluster and ACE observations of phase synchronization in intermittent magnetic field turbulence: a comparative study of shocked and unshocked solar wind

 

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