Density fluctuations in the presence of slab and quasi-two-dimensional turbulence

Details Density fluctuations in the presence of slab and quasi-two-dimensional turbulence Density fluctuations in the presence of slab and quasi-two-dimensional turbulence

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..471..527g&link_type=abstract

The solar wind nine conference. AIP Conference Proceedings, Volume 471, pp. 527-530 (1999).

Computer Science

Solar Wind Plasma, Sources Of Solar Wind, Magnetohydrodynamics And Plasmas

Scientific paper

Two-dimensional correlation function measurements of solar wind magnetic field fluctuations suggest the presence of two components-fluctuations with their wave vector parallel to the ambient magnetic field (e.g., slab turbulence) and fluctuations with their wave vector perpendicular to the ambient magnetic field (e.g., quasi-two-dimensional turbulence). Two-component correlation patterns can be reproduced from numerical simulation studies in cartesian geometry in either of two ways: First, such patterns can emerge from time averaging the interaction of slab Alfvén waves with velocity-shear or magnetic-shear structures. Alternatively, the pattern can appear if the initial state is composed of slab turbulence and a seed population of large-scale quasi-two-dimensional fluctuations. Here we consider the nature of density fluctuations that are associated with these two distinct types of two-component nonlinear dynamics. Recent theories suggest solar wind density fluctuations may scale according to the Mach number or the square of the Mach number. Analysis of the density fluctuations from 3D MHD simulation studies using two-component initial states may help clarify how these theories relate to the observations.

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