MHD Turbulence in the Earth's Plasma Sheet and Analogies with Laboratory Fluid-Flow Experiments

Details MHD Turbulence in the Earth's Plasma Sheet and Analogies with Laboratory Fluid-Flow Experiments MHD Turbulence in the Earth's Plasma Sheet and Analogies with Laboratory Fluid-Flow Experiments

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm62a04f&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM62A-04

Physics

2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities, 7831 Laboratory Studies, 7863 Turbulence

Scientific paper

The MHD flow turbulence in the Earth's plasma sheet is explored. For three major reasons, the turbulence is not expected to be analogous to the familiar homogeneous turbulence: (1) the proximity of boundaries, (2) the limited range of available MHD wavenumbers, and (3) the presence of dissipation at all wavenumbers owing to M-I coupling. The turbulences in various high-Reynolds-number laboratory fluid experiments are examined to find analogies with the turbulent plasma sheet. Fluid-wake experiments are examined to discern how the turbulence in the plasma sheet might be generated. Fluid-wake experiments are examined to explore the analogy between high-velocity flow bursts in fluid wakes and BBFs in the plasma sheet. Couette-flow experiments are examined to obtain ideas about why the turbulence correlation length is comparable to the thickness of the plasma sheet. Viscoelastic turbulence experiments are examined to predict the effects of M-I coupling on the plasma-sheet turbulence. Fluid-wake and Couette-flow experiments are examined to discern the properties of turbulences with a limited range of available wavenumbers. Finally, turbulent-flow experiments in which long-chain polymers are added to the fluid to suppress the turbulence at small scales are examined to predict the effects of cascading turbulent energy into non-MHD spatial scales smaller than the ion gyroradius in the plasma sheet.

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