Low-latitude Pi 1-2 magnetic pulsations of the August 28, 1986 substorm event

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概要

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• An isolated substorm occurred at 1153 UT on August 28,1986 provides an opportunity for studying a relation between low-latitude Pi 1-2 magnetic pulsations in the conjugate area around L=1.3-2.1 on the ground and a substorm-associated variation at geocentric distance of 8 R_E near the midplane of the magnetotail. The low-latitude Pi activities on the ground started ∿60 s after the onset time of the substorm-associated dipolarization with a possible formation of an X-type neutral line at AMPTE/CCE. The ground H-component pulsation showed a discrete frequency and an amplitude of nearly the same magnitude in a wide area around L=1.3-2.1,and its phase propagation was poleward and westward (m 〜1.7) during premidnight. The D-component odd-mode oscillation localized at L 〜2.1 on the ground had the same quasi-monochromatic period 〜13 s) as a compressional wave at AMPTE/CCE. These H-component global eigen mode and D-component localized mode may have been associated with a poloidal magnetic oscillation (including the "magnetosphere" cavity resonance mode) and a toroidal standing field-line oscillation excited by the compressional waves with impulsive and quasi-monochromatic components at AMPTE/CCE, respectively.

• 国立極地研究所の論文

著者

• Tanaka Yoichi

  Geosystems Inc.

• Saito Takao

  Onagawa Magnetic Observatory and Geophysical Institute, Tohoku University

• Tanaka Yoshihito

  Research Institute Of Atmospherics Nagoya University

• Yumoto Kiyohumi

  Research Institute Of Atmospherics Nagoya University

• Menk F.w.

  Department Of Physics University Of Newcastle

• Tanaka Yoichi

  Research Institute Of Atmospherics Nagoya University

• Takahashi Kazue

  Applied Physics Laboratory, The Johns Hopkins University

• Menk Fred

  Department of Physics, University of Newcastle

• Fraser Brian

  Department of Physics, University of Newcastle

• Fraser B.j.

  Department Of Physics University Of Newcastle

• Saito T

  Onagawa Magnetic Observatory And Geophysical Institute Tohoku University

• Takahashi Kazue

  Applied Physics Laboratory The Johns Hopkins University

• Tanaka Yoshihito

  Research Institute Of Atmospherics Nagaya University

• Saito Takao

  Onagawa Magnetic Observatory And Geophysical Institute Tohoku University

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