极地研究

极地研究 ›› 1999, Vol. 10 ›› Issue (2-English): 149-154.

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Seasonal characteristics of F region in lower solar activity period at Zhongshan Station, Antarctica

 He Longsong1, Liu Ruiyuan1, Liu Shunlin1,2 and Liu Yonghua1   

  1. 1 Polar Research Institute of China, Shanghai 200129, China;
    2 Department of Radio Science and Technology, Wuhan University, Wuhan 430072, China
  • 出版日期:1949-06-30 发布日期:1949-06-30
  • 通讯作者: He Longsong

Seasonal characteristics of F region in lower solar activity period at Zhongshan Station, Antarctica

 He Longsong1, Liu Ruiyuan1, Liu Shunlin1,2 and Liu Yonghua1   

  1. 1 Polar Research Institute of China, Shanghai 200129, China;
    2 Department of Radio Science and Technology, Wuhan University, Wuhan 430072, China
  • Online:1949-06-30 Published:1949-06-30
  • Contact: He Longsong

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摘要：

Based on data of Digisonde Portable Sounder-4 (DPS-4 ) in 1995 -1997. we have analyzed the seasonal variations of F region at Zhongshan Station (69. 4°S,76. 4°E ). During the summer of Zhongshan Station, F region ionization is mainly controlled by the solar ultraviolet radiation. Similar to the phenomena in mid-latitude area, the value f0F2 is changed with local time. During equinox scasons, soft electron precipitation from the cusp/cleft region seems significant, f0F2 is changed with rnagnetic local time, and shows the magnetic noon phenomenon. In winter, the effect of the solar radiation on the F region is less than that of summer. Instead, F region is affected by particle precipitation from cusp/cleft region as well as polar plasma convection, therefore, the diurnal variation of f0F2 is more complex and shows two peaks. F region occurs all day in summer. and seldom appears at midnight in equinox. In winter, F region shows two minimums, one is at midnight and the other is at afternoon cusp. Further analysis of the F region spread indicates that in winter the aurora oval passes over the Zhongshan Station is at 1 100 UT - 1 500 UT.

关键词: F region, magnetic noon phenomenon, F regin irregularity zone, Zhongshan Station

Abstract:

Based on data of Digisonde Portable Sounder-4 (DPS-4 ) in 1995 -1997. we have analyzed the seasonal variations of F region at Zhongshan Station (69. 4°S,76. 4°E ). During the summer of Zhongshan Station, F region ionization is mainly controlled by the solar ultraviolet radiation. Similar to the phenomena in mid-latitude area, the value f0F2 is changed with local time. During equinox scasons, soft electron precipitation from the cusp/cleft region seems significant, f0F2 is changed with rnagnetic local time, and shows the magnetic noon phenomenon. In winter, the effect of the solar radiation on the F region is less than that of summer. Instead, F region is affected by particle precipitation from cusp/cleft region as well as polar plasma convection, therefore, the diurnal variation of f0F2 is more complex and shows two peaks. F region occurs all day in summer. and seldom appears at midnight in equinox. In winter, F region shows two minimums, one is at midnight and the other is at afternoon cusp. Further analysis of the F region spread indicates that in winter the aurora oval passes over the Zhongshan Station is at 1 100 UT - 1 500 UT.

Key words: F region, magnetic noon phenomenon, F regin irregularity zone, Zhongshan Station