Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..209r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Feb. 1992, p. 209-215.
Physics
Atmospheric Physics, Earth Magnetosphere, Geomagnetic Micropulsations, Magnetohydrodynamic Waves, Nonuniform Plasmas, Plasma Waves, High Temperature Plasmas, Wave Equations, Wave Propagation
Scientific paper
Hydromagnetic waves generated in the magnetosphere propagating along the magnetic lines to the ground travel through a medium in which the Alfven velocity increases along the radial direction more rapidly than the variation along the wave vector. The effect of the inhomogeneity perpendicular to the field line on the polarization properties of the magnetic variations of various types of waves is studied, as the field lines corresponding to lower shells are excited by the impulse transmitted from the higher shell field lines. Even though the magnetic variation is predominantly longitudinal at the generation point, after a short distance in the equatorial plane, a transverse component will develop as a result of the plasma inhomogeneity in the direction normal to the magnetic field. This may be connected to the observed phenomenon that micropulsations detected on the ground at different latitudes have different polarization characteristics.
Roy Mou
Tajima Toshiki
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