极地研究

极地研究 ›› 1999, Vol. 10 ›› Issue (2-English): 133-140.

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Ionospheric absorption at Zhongshan Station, Antarctica during magnetic storms in early May, 1998

 Liu Ruiyuan1, He Longsong1, Hu Hongqiao1,2 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: Liu Ruiyuan

Ionospheric absorption at Zhongshan Station, Antarctica during magnetic storms in early May, 1998

 Liu Ruiyuan1, He Longsong1, Hu Hongqiao1,2 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: Liu Ruiyuan

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摘要：

In the paper the high latitude ionospheric absorption events, monitored by an imaging riometer at Zhongshan Station, Antarctica, are examined during magnetic storms in early May, 1998. The storm absorption at ~0 639 UT on May 2 was mainly an equatorward progressing absorption event, which were associated with a strong negative bay of the magnetic H component and with a large Pc3 range pulsation. There was a time lag of about 1. 5 hours between the onset of the ionospheric disturbance and the IMF southward turning in the solar wind. The event at 2 222 UT on May 2 was a typical midnight absorption spike event. The absorption region took the form of an elongated strip with the length of 100 - 150 km and the width of 30 - 40 km. The absorption during 0 830-1 200 UT on May 6 was a polar cap absorption (PCA) event,caused by intense precipitation of high-energy protons erupted after a large solar flare explosion.

关键词: ionospheri absorption, magnetic storms, riometer, Zhongshan Station, Antarctica

Abstract:

In the paper the high latitude ionospheric absorption events, monitored by an imaging riometer at Zhongshan Station, Antarctica, are examined during magnetic storms in early May, 1998. The storm absorption at ~0 639 UT on May 2 was mainly an equatorward progressing absorption event, which were associated with a strong negative bay of the magnetic H component and with a large Pc3 range pulsation. There was a time lag of about 1. 5 hours between the onset of the ionospheric disturbance and the IMF southward turning in the solar wind. The event at 2 222 UT on May 2 was a typical midnight absorption spike event. The absorption region took the form of an elongated strip with the length of 100 - 150 km and the width of 30 - 40 km. The absorption during 0 830-1 200 UT on May 6 was a polar cap absorption (PCA) event,caused by intense precipitation of high-energy protons erupted after a large solar flare explosion.

Key words: ionospheri absorption, magnetic storms, riometer, Zhongshan Station, Antarctica