Pc 3 magnetic pulsations observed at low latitudes: A possible model

元データ 国立極地研究所

概要

It is recently demonstrated that Pc 3 magnetic polarizations observed at equatorial latitudes (|φ|<20°) are different from those at low-latitude Japan-Australia conjugate stations (|φ|∿35°). In order to interpret the Pc 3 polarization characteristics at lower latitudes (|φ|≲45°), we propose a probable, new qualitative model in which two (or more) superimposed ionospheric eddy currents, oscillating with slight differences in frequency in the Pc 3 range and in apparent azimuthal wave number, move azimuthally at low latitudes (|φ|≲45°). Near low latitudes of |φ|∿45°ionospheric rotational Hall currents should be induced by field-aligned currents associated with localized shear Alfven waves which are excited by compressional Pc 3 source waves near |φ|∿45°. Near the equatorial region ionospheric Pedersen eddy currents may be caused by inductive electric fields of compressional Pc 3 source waves which would propagate from the outer magnetosphere to the equatorial ionosphere.

著者

Tanaka Yoichi Geosystems Inc.
Yumoto Kiyohumi Onagawa Magnetic Observatory and Geophysical Institute, Tohoku University
Saito Takao Onagawa Magnetic Observatory and Geophysical Institute, Tohoku University
Tanaka Yoshihito Research Institute Of Atmospherics Nagoya University
Tanaka Yoichi Research Institute Of Atmospherics Nagoya University
Yumoto Kiyohumi Onagawa Magnetic Observatory And Geophysical Institute Tohoku University
Saito T Onagawa Magnetic Observatory And Geophysical Institute Tohoku University
Tanaka Yoshihito Research Institute Of Atmospherics Nagaya University
Saito Takao Onagawa Magnetic Observatory And Geophysical Institute Tohoku University

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