Characteristics of Pc 3 magnetic pulsations in conjugate area around L=1.3-2.1

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概要

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• In order to establish both our theoretical and experimental researches on low-latitude Pc 3 magnetic pulsations, we carried out the Japan-Australia magnetic conjugate observations at Asahikawa (ASH; λ=142.2°, φ=43.93°, L=1.55), Onagawa (ONW; 141.48°, 38.43°, 1.30) in Japan and Birdsville (BSV; 139.3°, -25.83°, 1.55), i. e., the conjugate point of ASH, Dalby (DAL; 151.2°, -27.18°, 1.56) and St. Kilda (SKD; 138.5°, -34.7°, 2.11) in Australia during the period from 20 July to 16 September 1986. From the analysis of these conjugate-station data, occurrence and polarization characteristics of low-latitude Pc 3 pulsations are found as follows; (1) The average amplitudes at SKD (L=2.1) is about 2.5 times of that at BSV (1.55). (2) The H-component amplitude at BSV in the winter hemisphere is larger than that at ASH in the summer hemisphere. (3) The polarizations at all northern (soushern) stations switch statistically from left- (right-) handed in the morning to right- (left-) handed in the afternoon. Where polarization senses are given by a view looking down onto the earth in each hemisphere. (4) However, the switch from L-H (R-H) to R-H (L-H) polarization at the conjugate northern (southern) stations (L=1.55) is found not to be always occurring near local noon, and sometimes occur at 〜5 and 〜17h local time. (5) The abrupt changes of major axis orientations of Pc 3 polarization ellipses appear to coincide with the E-layer ionization enhancement and depression, associated with local sunrise and sunset, respectively.

• 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

• Menk F.w.

  Department Of Physics University Of Newcastle

• Lynn K.j.w.

  Electronics Research Laboratory Defence Research Centre

• Tanaka Yoichi

  Research Institute Of Atmospherics Nagoya University

• Fraser B.J.

  Department of Physics, The University of Newcastle

• Fraser B.j.

  Department Of Physics University Of Newcastle

• 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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