Physics – Geophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh51d1717s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH51D-1717
Physics
Geophysics
[2149] Interplanetary Physics / Mhd Waves And Turbulence, [2159] Interplanetary Physics / Plasma Waves And Turbulence, [4490] Nonlinear Geophysics / Turbulence
Scientific paper
In the interplanetary medium, fluctuations in velocity and magnetic field show evidence of turbulent energy cascades. Near 1 AU, Advanced Compositional Explorer (ACE) plasma and magnetic field data have been used by us to compute third-order moments. The cascade rate can be directly evaluated from these moments, and the results are in agreement with rate needed to account for proton heating. Assuming homogeneous shear flow, the total velocity can be split into the sum of a fluctuation and shear part. This approach can be taken to examine the role of velocity shear which at large scales is an important driver of the turbulence at 1 AU. We present results from a linear detrending of velocity for 12 hour samples and provide estimates of the various contributing third-order moments for the fluctuating and shear components. We find that the cascade rate can be recovered with an inferred anisotropy of the fluctuations due to velocity shear.
Forman Miriam A.
Smith Walter C.
Stawarz Joshua E.
Vasquez Bernard J.
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