MHD Turbulence in the Magnetotail Plasma Sheet

Details MHD Turbulence in the Magnetotail Plasma Sheet MHD Turbulence in the Magnetotail Plasma Sheet

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm41c..07e&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM41C-07

Physics

[2744] Magnetospheric Physics / Magnetotail, [2753] Magnetospheric Physics / Numerical Modeling, [2764] Magnetospheric Physics / Plasma Sheet

Scientific paper

Observations indicate that MHD turbulence is an important component of transport in the magnetotail. To help understand MHD turbulence in the magnetosphere we performed idealized global MHD simulations in which there was no turbulence in the solar wind - all fluctuations must be of internal origin. Purely northward and southward IMF conditions were investigated. We computed power spectral densities (PSDs) and probability distribution functions (PDFs) at different locations. These analyses show that the magnetic field and velocity are consistent with turbulence in the plasma sheet. The simulation results show three PSD frequency ranges: the driving range, the inertial range, and the dissipative range. The simulation also shows that there is considerable wave activity along the magnetopause. We will discuss sources of magnetotail turbulence and in particular the relationship between the boundary waves and the turbulence.

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