The effect of an ionospheric inhomogeneity on magnetic pulsation polarization

Details The effect of an ionospheric inhomogeneity on magnetic pulsation polarization The effect of an ionospheric inhomogeneity on magnetic pulsation polarization

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.1425b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, v. 59, p. 1425-1434.

Physics

2

Scientific paper

The problem of magnetic disturbance polarization on the ground for a dipole source in the inhomogeneous ionosphere is solved for two kinds of an horizontal inhomogeneity. One is the case when the ionosphere is separated into two distinct parts with different conductivities and the other is a meso-scale strip in the ionosphere strip with enhanced conductivity which may be associated with an auroral arc. By using the `method of reflection' an electric potential of the polarization field and a current function of the equivalent ionospheric currents are found for these cases. The distributions of the magnetic disturbance polarization ellipses on the ground have been obtained. It is found that under the certain ionospheric conditions the inhomogeneity can cause a significant (up to 40%) contribution to the magnetic disturbance amplitude on the ground and change essentially its polarization. For the first case the contribution of the inhomogeneity to magnetic variations on the ground is symmetric relative to the boundary. This boundary separates the regions with different rotation sense of the magnetic disturbance vector. For the case of the meso-scale strip, it is found that on the ground the magnetic polarization ellipse distribution becomes asymmetric and complicated. The line separating the regions with different rotation sense becomes curved.

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