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

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概要

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• 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.

• 国立極地研究所の論文

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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