Kinetic Simulations of Shear Alfvén Waves in Magnetospheric Plasmas

Details Kinetic Simulations of Shear Alfvén Waves in Magnetospheric Plasmas Kinetic Simulations of Shear Alfvén Waves in Magnetospheric Plasmas

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0466w&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0466

Physics

2411 Electric Fields (2712), 2712 Electric Fields (2411), 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling, 2772 Plasma Waves And Instabilities

Scientific paper

Standing shear Alfvén waves (SAW) are commonly observed in the Earth's magnetosphere. These standing waves excite time-varying electric currents in the direction parallel to the magnetic field. Both observations and numerical studies suggest that low-frequency (a few mHz) standing SAW may produce parallel electric fields in the polar magnetosphere. We extend the linearized perturbation approach of Tikhonchuk and Rankin [Physics of Plasmas, 7, 2630, 2000]. They demonstrated that a kinetic treatment of the non-local electron response to the standing SAW can produce parallel electric fields which are in good agreement with observations, in contrast to the two-fluid treatment, which gives parallel electric fields which are too weak. We solve the full nonlinear coupled Vlasov-Maxwell system in one dimension. In order to avoid numerical problems with the evaluation of E\|=-(∂ A\|/∂ t)-(∂ φ /∂ z) in the electron kinetic equation, we describe the electron distribution function in terms of a spatial coordinate along the field line, the magnetic moment μ, and the canonical momentum p\|=v_\|+(q/m)A_\|. We model SAW with our code and study the resulting parallel electric fields.

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