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

元データ 国立極地研究所

概要

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.

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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