Horizontal transmission of the polar electric field to the equator

Details Horizontal transmission of the polar electric field to the equator Horizontal transmission of the polar electric field to the equator

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jatp...41..927k&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 41, Sept. 1979, p. 927-936.

Physics

49

Atmospheric Electricity, Electric Fields, Equatorial Atmosphere, Ionospheric Propagation, Polar Regions, Atmospheric Attenuation, Lines Of Force, Midlatitude Atmosphere, Propagation Modes, Waveguides

Scientific paper

The propagation mode which transmits the electric field impressed suddenly on the polar ionosphere to the equator is examined by assuming a two-dimensional plane earth-ionosphere waveguide system. The zeroth-order transverse magnetic waveguide excited by the polar electric field propagates instantaneously to the low-latitude accompanying the electric field with the same direction as the polar field. The geometrical attenuation of the transmitted electric field due to the finite scale of the polar field causes the disappearance of the preliminary reverse impulse (PRI) at low latitudes, but the PRI appears again in the dayside equatorial region because of the enhanced ionospheric conductivity. It is suggested that the direct current flows between the magnetosphere and the equatorial ionosphere via the polar ionosphere when a large scale electric field is generated in the magnetosphere. From the mid-latitude ionospheric part of this current, the electric field may be mapped upward along the magnetic lines of force into the low L-value hydromagnetic region, and thus the penetration of the magnetospheric electric field into the plasmasphere is achieved by the earth-ionosphere waveguide.

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