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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 111,
A02102,
doi:10.1029/2005JA011479,
2006
Cross-scale coupling-induced intermittency near interplanetary shocks
Z. Vörös
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
M. P. Leubner
Institute of Astrophysics, University of Innsbruck, Innsbruck, Austria
W. Baumjohann
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
Abstract
Several approaches exist to address the problem of intermittency in solar wind turbulence. The traditional explanation based
on spectral transfer of energy between separated scales through sequential steps within a cascade can elucidate scalings and
intermittent emergence of small-scale dissipative structures. A recent point of view connects intermittency mainly with the
occurrence of discontinuities and interaction of flux tube-like coherent structures. In this paper we analyze the interrelationship
between skewness and kurtosis near interplanetary shocks. On the basis of a comparison of our results with the behavior of
skewness and kurtosis in laboratory experiments and numerical simulations we show that large-scale boundaries and/or scalar
gradient fields imposed on solar wind turbulence can lead to a local increase of small-scale intermittency via direct coupling
between separated scales. As each scenario is supported by experiments, they represent a complementary way of looking at intermittency.
Received 18
October
2005;
accepted 30
November
2005;
published 17
February
2006.
Keywords: turbulence;
intermittency;
cross-scale coupling.
Index Terms: 2139 Interplanetary Physics: Interplanetary shocks; 2149 Interplanetary Physics: MHD waves and turbulence (2752, 6050, 7836); 2164 Interplanetary Physics: Solar wind plasma; 2159 Interplanetary Physics: Plasma waves and turbulence.
Read Full Article (file size: 877396 bytes) Cited by
Citation: Vörös, Z., M. P. Leubner, and W. Baumjohann
(2006),
Cross-scale coupling-induced intermittency near interplanetary shocks,
J. Geophys. Res.,
111,
A02102,
doi:10.1029/2005JA011479.
Copyright 2006 by the American Geophysical Union.
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