Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh53a..09s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH53A-09
Physics
Plasma Physics
[2159] Interplanetary Physics / Plasma Waves And Turbulence, [2164] Interplanetary Physics / Solar Wind Plasma, [7859] Space Plasma Physics / Transport Processes, [7863] Space Plasma Physics / Turbulence
Scientific paper
MHD fluctuations in the presence of large scale background flows are investigated. The background inhomogeneous flows are treated statically, whereas the fluctuations evolve according to MHD turbulence. We find that the large scale inhomogeniety introduces intrinsic compressibility in the evolution of characteristic turbulent fluctuations. Consequently, turbulence is dominated by compressible modes over the Aflvenic fluctuations. Energy cascades are slowed down by the inhomogeneous flows which further lead to the flattening of the turbulent spectra from the usual Kolmogorov-like 5/3 law. Finally, the large scale flows tend to introduce significant deviation from Guassianiaty in the nature of anisotropic and inhomogeneous solar wind MHD turbulence.
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