Whistlers in the Inhomogeneous Plasma

Details Whistlers in the Inhomogeneous Plasma Whistlers in the Inhomogeneous Plasma

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm43a..05s&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM43A-05

Physics

2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2772 Plasma Waves And Instabilities

Scientific paper

Results from a numerical study of the dynamics of the whistler waves in the magnetospheric plasma are presented. In this study the plasma is considered to be homogeneous in the direction along the ambient magnetic field and strongly inhomogeneous across it. Thus the goal of this investigation is to understand the dynamics of the whistlers inside the plasma chanel (duct) extended along the ambient magnetic field and localized across it. The plasma density inside the duct can be higher (high-density duct) or lower (low-density duct) than the density outside the duct. Analysis of the whistler dispersion relation predicts trapping of the wave inside the duct depending on the parameters of the plasma, ambient magnetic field, and the whistler itself (frequency, perpendicular and parallel wavelength). But because this dispersion relation is derived assuming the validity of the geometrical optic approximation, it does not describe effects of the strong density gradients forming the walls of the duct on the dynamics of the whistler. Numerical simulations of the quasi-longitudinal, electron MHD model, providing a full wave description of the whistler, reveal that these effects can be quite important, particularly when the perpendicular wavelength of the whistler is comparable to the scale-size of the plasma inhomogeneity. In particular, simulations demonstrate how the quality of the high-density duct depends on the scale-size of the transverse inhomogeneity.

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