Kinetic Alfven waves as a source of plasma transport at the dayside magnetopause

Details Kinetic Alfven waves as a source of plasma transport at the dayside magnetopause Kinetic Alfven waves as a source of plasma transport at the dayside magnetopause

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9917405l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A9, p. 17,405-17,411

Physics

28

Kinetics, Magnetic Field Reconnection, Magnetohydrodynamic Waves, Magnetopause, Mathematical Models, Transport Theory, Coupling, Electric Fields, Magnetic Fields, Plasma Density, Solar Terrestrial Interactions, Solar Wind

Scientific paper

As the shocked solar wind with variable plasma density and magnetic field impinges on the dayside magnetopause, it is likely to generate large-scale Alfven waves at the solar wind magnetosphere interface. However, large gradients in the density and magnetic field at the magnetopause boundary effectively couple large-scale Alfven waves with kinetic Alfven waves may play an important role in plasma transport at the dayside magnetopause and in electron acceleration along field lines. The transport can occur because, unlike the magnetohydrodynamic (MHD) shear Alfven wave, the kinetic Alfven wave has an associated parallel electric field which breaks down the 'frozen-in' condition and decouples the plasma from field lines. We calculate the average deviation of the plasma from the field line from which we estimate the diffusion coefficient associated with these 'bundles' of lead to acceleration of electrons along field lines in the magnetopause boundary and may possibly provide an explanation for observed counterstreaming electron beams characterized by energies of 50-200 eV.

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