Influence of solar wind dynamic pressure on geomagnetic Dst index during various magnetic storms  

作　　者：ZHAO Hong ZONG QiuGang WEI Yong WANG YongFu 

机构地区：[1]Institute of Space Physics and Applied Technology, Peking University, Beijing 100871, China [2]Center for Atmospheric Research, University of Massachusetts Lowell, MA 01854-3629, USA

出　　处：《Science China(Technological Sciences)》2011年第6期1445-1454,共10页中国科学（技术科学英文版）

基　　金：supported by the Key Project of the National Natural Science Foundation of China (Grant No 40831061)

摘　　要：The Dst index,designed as a proxy of ring current intensity,is known to be also affected by other magnetospheric current systems,e.g.magnetopause current.The pressure-corrected Dst index is obtained by removing the effects of the solar wind dynamic pressure and the quiet time ring current.However,all previous studies treated the correction coefficient as an averaged parameter for storms of different intensity.In this paper,based on the Burton's equations and employing two independent methods,we will show a positive correlation between pressure-correction coefficient b and the intensity of the storms.We divided our storm database(872 storms in total) into three categories according to the intensity of storms.In order to improve the accuracy of calculating,we also used the higher-resolution SYM-H index data instead of Dst index to compute the corrected Dst index during different storms.Furthermore,we are able to provide corrected magnetic storm index with high-time resolution(-1 min).

关 键 词：corrected Dst index pressure correction geomagnetic storms with different intensity 

分 类 号：P353.8[天文地球—空间物理学] TH137.51[天文地球—地球物理学]