Duct propagation of hydromagnetic waves in the upper ionosphere. I - Electromagnetic field disturbances in high latitudes associated with localized incidence of a shear Alfven wave

Details Duct propagation of hydromagnetic waves in the upper ionosphere. I - Electromagnetic field disturbances in high latitudes associated with localized incidence of a shear Alfven wave Duct propagation of hydromagnetic waves in the upper ionosphere. I - Electromagnetic field disturbances in high latitudes associated with localized incidence of a shear Alfven wave

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9314665f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Dec. 1, 1988, p. 14665-14673.

Physics

31

Electromagnetic Fields, Ionospheric Propagation, Magnetohydrodynamic Waves, Polar Regions, S Waves, Upper Ionosphere, E Region, Hall Effect, Ionospheric Currents

Scientific paper

Mode conversion to the fast magnetosonic wave by anisotropic ionospheric currents from a localized incident shear Alfven wave is studied in detail, based on a simple layered model inclusive of an anisotropic conducting sheet (the ionospheric E layer) and an upper ionospheric ducting layer under vertical uniform ambient magnetic field lines. A horizontal profile EM field intensity at the E layer shows a wider spread than that of the incident wave, due to trapping of the fast magnetosonic wave in the ducting layer. Since electrostatic electric field intensity of the incident Alfven wave is dominant in the central region, the eddy Hall current associated with the Alfven wave generates the ground magnetic field variations.

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