极地研究

极地研究 ›› 2002, Vol. 13 ›› Issue (1-English): 29-36.

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Propagation and source of Pc5 frequency range pulsation at cusp latitude

 Liu Yonghua1, He Longsong1, Yang Shaofeng2, Liu Ruiyuan1 and Fraser B. J.3   

  1. 1 Polar Research Institute of China, Shanghai 200129, China;
    2 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China;
    3 University of Newcastle, Newcastle 2308, Australia
  • 出版日期:1952-03-30 发布日期:1952-03-30
  • 通讯作者: Liu Yonghua

Propagation and source of Pc5 frequency range pulsation at cusp latitude

 Liu Yonghua1, He Longsong1, Yang Shaofeng2, Liu Ruiyuan1 and Fraser B. J.3   

  1. 1 Polar Research Institute of China, Shanghai 200129, China;
    2 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China;
    3 University of Newcastle, Newcastle 2308, Australia
  • Online:1952-03-30 Published:1952-03-30
  • Contact: Liu Yonghua

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摘要：

Two induction magnetometers have been installed at Chinese Zhongshan Station and Australia Davis Station, Antarctica respectively. We adopt the cross spectral analysis technique to analyze the data of the two induction magnetometers, in June, September, December 1996 and March 1997, and to investigate Pc5 frequency range pulsation (150-600 s) occurrence and propagation in cusp latitude. The results are summarized as follows: At Zhongshan-Davis Station, the magnetic pulsations in Pc5 frequency band can occurs over a wide time, but more frequently at pre local magnetic noon and pre local magnetic midnight. The Pc5 pulsations have no significant seasonal variation in the amplitude, occurrence and propagation. The amplitude has a small peak at pre local magnetic noon and large value sometimes at pre local magnetic midnight. In daytime, the Pc5 pulsations propagate westward in morning and eastward in afternoon, and reversal at local magnetic noon. In nighttime, the Pc5 pulsations propagate westward before 20:00 MLT and eastward after 20:00 MLT. Near dusk time, the Pc5 pulsations propagate irregularly. These characteristics indicate that the Pc5 pulsations have different source at different local magnetic time.

关键词: cusp latitude, Pc5 pulsations, local magnetic noon, propagation

Abstract:

Two induction magnetometers have been installed at Chinese Zhongshan Station and Australia Davis Station, Antarctica respectively. We adopt the cross spectral analysis technique to analyze the data of the two induction magnetometers, in June, September, December 1996 and March 1997, and to investigate Pc5 frequency range pulsation (150-600 s) occurrence and propagation in cusp latitude. The results are summarized as follows: At Zhongshan-Davis Station, the magnetic pulsations in Pc5 frequency band can occurs over a wide time, but more frequently at pre local magnetic noon and pre local magnetic midnight. The Pc5 pulsations have no significant seasonal variation in the amplitude, occurrence and propagation. The amplitude has a small peak at pre local magnetic noon and large value sometimes at pre local magnetic midnight. In daytime, the Pc5 pulsations propagate westward in morning and eastward in afternoon, and reversal at local magnetic noon. In nighttime, the Pc5 pulsations propagate westward before 20:00 MLT and eastward after 20:00 MLT. Near dusk time, the Pc5 pulsations propagate irregularly. These characteristics indicate that the Pc5 pulsations have different source at different local magnetic time.

Key words: cusp latitude, Pc5 pulsations, local magnetic noon, propagation