Finite Element Modeling of Dispersive Field Line Resonances in Dipolar and Stretched Magnetic Fields

Details Finite Element Modeling of Dispersive Field Line Resonances in Dipolar and Stretched Magnetic Fields Finite Element Modeling of Dispersive Field Line Resonances in Dipolar and Stretched Magnetic Fields

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11a0788l&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11A-0788

Physics

2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2447 Modeling And Forecasting, 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling

Scientific paper

Using a two-dimensional finite element code, we investigate the nonlinear interaction of shear Alfven wave (SAW) field line resonances (FLRs) and ion acoustic waves in Earth's magnetosphere. An important contribution of this analysis is that it accounts for a full set of reduced MHD equations self consistently. This is in contrast to previous studies in which a set of linearized equations was considered. The MHD model includes the effects of electron inertia and electron thermal pressure. Two geomagnetic field geometries are condisered: a dipolar magnetic field and a stretched magnetic field from Tsyganenko 90 model. To understand the behavor of standing SAWs under varying ambient conditions, we present a parametric study for plasma β and the ratio of ion and electron temperatures. A detailed discussion to the characteristics of density cavity, parallel velocity, field-aligned current, magnetic and electric fields are given. It is shown that the numerical model of dispersive FLRs reproduces the main observational features of discrete auroral arcs.

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