Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh54b..03o&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH54B-03
Physics
Plasma Physics
[2134] Interplanetary Physics / Interplanetary Magnetic Fields, [2149] Interplanetary Physics / Mhd Waves And Turbulence, [4490] Nonlinear Geophysics / Turbulence, [7863] Space Plasma Physics / Turbulence
Scientific paper
Multispacecraft measurements in the solar wind are used to determine the sunward and anti-sunward energy cascade rates in magnetohydrodynamic (MHD) inertial range turbulence. The two-point mixed third-order structure functions of Elsasser fluctuations are projected onto a sphere in magnetic field-aligned coordinates, where the radius of the sphere corresponds to the mean spacecraft separation in the plasma frame. In adopting a fully anisotropic form of the integration over the sphere, estimates of the volume integrated heating and cascade rates are obtained that make limited assumptions about the underlying spectral geometry of MHD turbulence. The results are consistent with a direct energy cascade, where the transfer rate is slightly faster for the anti-sunward fluctuations.
Dasso Sergio
Matthaeus William H.
Osman K.
Wan Michael
Weygand James M.
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