空间科学学报2017，Vol.37Issue(6)：659-666,8.DOI:10.11728/cjss2017.06.659
太阳风动压脉冲结构与地磁急始关系研究
Relationship between Dynamic Pressure Pulse and Geomagnetic Sudden Commencement
摘要
Abstract
A deep understanding of the relationship between geomagnetic SC (Sudden Commencement) and DPP (Dynamic Pressure Pulse) is important for comprehensively understanding the response characteristics of geomagnetic field to interplanetary disturbance and improving the ability of SC prediction.In this paper,363 SC events observed between 1994 and 2011 are the objectives.Firstly,whether there are corresponding DPP events associated with the SC events or not are determined by using automatic DPP recognition algorithm.Secondly,the characteristics of the DPP events and the SC events as well as their relationship statistically are analyzed.The results are as follows.91％ of the SC events are associated with the DPP events,and 53％ of the SC events are associated with the shocks.The DPP events and the shocks are observed by WIND satellite.This result indicates that DPP is the main cause of SC.Most of the DPP events (70％) that cause the SC events are associated with large scale solar wind structures,such as Interplanetary Coronal Mass Ejections (ICME),Corotating Interaction Region (CIR) and complex projections aused by ICME and/or CIR.And the averaged dynamic pressure amplitude change of the DPP events is 3.9 nPa.Strong DPP events account for 42％ of all the events.There is an obvious relationship between the amplitude of the SC events and the absolute dynamic pressure change as well as the difference of the square root of the dynamic pressure of the DPP events,and the correlation coefficients are 0.79 and 0.82,respectively.The correlations between them are much stronger when the interplanetary magnetic field is southward.Although the duration,speed and amplitude of DPP have a certain influence on the duration of SC respectively,there is no obvious relationship between them.These results contribute to the prediction of SC based on DPP parameters.关键词
太阳风动压脉冲结构/地磁急始/行星际南向磁场Key words
Dynamic pressure pulse/Sudden commencement/Southward interplanetary magnetic field分类
天文与地球科学引用本文复制引用
李玉鑫,解妍琼..太阳风动压脉冲结构与地磁急始关系研究[J].空间科学学报,2017,37(6):659-666,8.基金项目
国家自然科学基金项目资助(41304146) （41304146）
