Study and observation of the great solar event in July 2000 at cusp latitude

极地研究 ›› 2001, Vol. 12 ›› Issue (2-English): 145-152.

Study and observation of the great solar event in July 2000 at cusp latitude

Liu Yonghua, Liu Ruiyuan, Hu Hongqiao and Xu Zhonghua

Polar Research Institute of China, Shanghai 200129, China

出版日期:1951-06-30 发布日期:1951-06-30
通讯作者: Liu Yonghua

Study and observation of the great solar event in July 2000 at cusp latitude

Liu Yonghua, Liu Ruiyuan, Hu Hongqiao and Xu Zhonghua

Polar Research Institute of China, Shanghai 200129, China

Online:1951-06-30 Published:1951-06-30
Contact: Liu Yonghua

摘要/Abstract

摘要：

A series of solar flare and coronal mass ejection (CME) event occurred in July 2000, particularly the largest flare (X5.7/3B) with CME on 14th of July since 1989, which stimulated a great geomagnetic storm with D_st index reaching -300 nT. A number of data have been obtained from the Chinese Antarctic Zhongshan Station (ZHS, INT Lat. 74.5°, L≈14), which is located at cusp latitude, and from the ACE satellite. After analyzing these data we have got the results as follows: a lot of solar high energy particles penetrated into the polar ionosphere and ionized it, which significantly increased the cosmic noise absorption (CNA) and blanked the DPS-4 data for more than two days. The magnetic pulsation in Pc 3/5 frequency band on the ground has a high relation with the fluctuation of interplanetary magnetic field (IMF) B_z, which shows the contribution of interplanetary magnetohydrodynamical (MHD) waves to the Pc 3/5 pulsation on the ground. The Pc 3/5 pulsation was intensified much during the great magnetic storm. The H component of the magnetic field at ZHS varied with the southern value of IMF B z but lagged behind for about 8-10 h. While D_st index responded to the variation of the IMF B_z very quickly, which suggested that the magnetic storm occurred at low latitude firstly and then effected the ionospheric current at high latitude.

关键词: flare, CME event, geomagnetic storm, cusp, Zhongshan Station

Abstract:

Key words: flare, CME event, geomagnetic storm, cusp, Zhongshan Station

Liu Yonghua, Liu Ruiyuan, Hu Hongqiao, Xu Zhonghua. Study and observation of the great solar event in July 2000 at cusp latitude[J]. 极地研究, 2001, 12(2-English): 145-152.

Liu Yonghua, Liu Ruiyuan, Hu Hongqiao, Xu Zhonghua. Study and observation of the great solar event in July 2000 at cusp latitude[J]. ADVANCES IN POLAR SCIENCE, 2001, 12(2-English): 145-152.

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Study and observation of the great solar event in July 2000 at cusp latitude

Study and observation of the great solar event in July 2000 at cusp latitude

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