Asymmetry in the electric and magnetic field polarization of geomagnetic pulsations

Physics

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Scientific paper

Simultaneous measurements of the electric and magnetic field of ULF waves at ground and balloon heights have revealed polarizations of opposite handedness. Magnetosonic wave propagation through a horizontally homogeneous high-latitude ionosphere experiences a polarization change (elliptization and rotation). It is shown that the polarization change continues further through the atmosphere and results in different polarization states for the electric and magnetic fields. The opposite handedness of the Pc5 wave polarization recorded at the South Pole by measurements of the electric and magnetic field components [Bering, E.A., Benbrook, J.R., Byrne, G.J., Liao, B., Theall, J.R., Lanzerotti, L.J., Maclennan, C.G., 1995. Baloon measurements above the South Pole: study of ionospheric transmission of ULF waves. J. Geophys. Res. 100(A5), 7807-7819.] might be explained as a result of an initial left-hand polarization of the ULF wave generated above the ionosphere and by an additional right-hand polarization effect in the ionosphere/atmosphere produced mostly on the wave magnetic field.

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