Investigation of Intermittency in Magnetohydrodynamics and Solar Wind Turbulence: Scale-dependent Kurtosis

Details Investigation of Intermittency in Magnetohydrodynamics and Solar Wind Turbulence: Scale-dependent Kurtosis Investigation of Intermittency in Magnetohydrodynamics and Solar Wind Turbulence: Scale-dependent Kurtosis

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...744..171w&link_type=abstract

The Astrophysical Journal, Volume 744, Issue 2, article id. 171 (2012).

Astronomy and Astrophysics

Astronomy

Magnetohydrodynamics: Mhd, Solar Wind, Turbulence

Scientific paper

The behavior of scale-dependent (or filtered) kurtosis is studied in the solar wind using magnetic field measurements from the ACE and Cluster spacecraft at 1 AU. It is also analyzed numerically with high-resolution magnetohydrodynamic spectral simulations. In each case the filtered kurtosis increases with wavenumber, implying the presence of coherent structures at the smallest scales. This phase coupling is related to intermittency in solar wind turbulence and the emergence of non-Gaussian statistics. However, it is inhibited by the presence of upstream waves and other phase-randomizing structures, which act to reduce the growth of kurtosis.

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