极地研究

极地研究 ›› 1997, Vol. 8 ›› Issue (1-English): 8-17.

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Two types of ionospheric disturbances in the auroral region

 Shen Changshou1, Zi Minyun2 and K. Schlegel3   

  1. 1Department of Geophysics, Peking University, Beijing 100871, China 2The Academy of Arts of China, Beijing 100009, China 3Max-Planck-Institut für Aeronomie, D-37191, Germany
  • 出版日期:1947-03-30 发布日期:1947-03-30
  • 通讯作者: Shen Changshou
  • 基金资助:

    This project was supported by National Natural Science Foundation of China.

Two types of ionospheric disturbances in the auroral region

 Shen Changshou1, Zi Minyun2 and K. Schlegel3   

  1. 1Department of Geophysics, Peking University, Beijing 100871, China 2The Academy of Arts of China, Beijing 100009, China 3Max-Planck-Institut für Aeronomie, D-37191, Germany
  • Online:1947-03-30 Published:1947-03-30
  • Contact: Shen Changshou
  • Supported by:

    This project was supported by National Natural Science Foundation of China.

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摘要：

The EISCAT data are used to confirm the important role of precipitation particles in the ionization rate in the auroral region. The height range of the effective ionization is quite different for particles with different energies. On the other hand, an enhancement of magnetospheric convection often results in decreasing of electron density, N, in the F-layer. During January 28~29,1985, the disturbed profiles of N were very typical, in which Nm (E- layer) >> N (F-layer) and N decreased with height above 147 km. This phenomenan is caused by both energetic particles and intensive convection. During the period of February 16~17, 1993, however, the N (F-layer) increased extremely, while N (E-layer) remained low. This is also a typical profile, but is opposite to the former one. In this case,the particles with lower energy (<1 keV) in the magnetosheath enter directly the high latitude ionosphere through the cusp, and can contribute significantly to the F-layer ionization content.

关键词: precipitation particles, magnetospheric convection, cusp, auroral ionosphere

Abstract:

The EISCAT data are used to confirm the important role of precipitation particles in the ionization rate in the auroral region. The height range of the effective ionization is quite different for particles with different energies. On the other hand, an enhancement of magnetospheric convection often results in decreasing of electron density, N, in the F-layer. During January 28~29,1985, the disturbed profiles of N were very typical, in which Nm (E- layer) >> N (F-layer) and N decreased with height above 147 km. This phenomenan is caused by both energetic particles and intensive convection. During the period of February 16~17, 1993, however, the N (F-layer) increased extremely, while N (E-layer) remained low. This is also a typical profile, but is opposite to the former one. In this case,the particles with lower energy (<1 keV) in the magnetosheath enter directly the high latitude ionosphere through the cusp, and can contribute significantly to the F-layer ionization content.

Key words: precipitation particles, magnetospheric convection, cusp, auroral ionosphere