Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh43c1982w&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH43C-1982
Physics
Plasma Physics
[2164] Interplanetary Physics / Solar Wind Plasma, [7827] Space Plasma Physics / Kinetic And Mhd Theory, [7863] Space Plasma Physics / Turbulence
Scientific paper
A well known feature of turbulence is the existence of intermittency, a feature which has been widely studied in solar wind. The issue of intermittency is investigated by studying the behavior of scale-dependent kurtosis 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 (MHD) spectral simulations. Kurtosis increases with filter 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.
Matthaeus William H.
Osman K.
Wan Michael
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