伴随磁层稳态对流的磁暴及磁暴期间环电流的特征  

Magnetic Storms Accompanied with Steady Magnetospheric Convection and Characteristics of the Ring Current during the Storms

作　　者：提烁 沈超 陈涛 曾刚 TI Shuo;SHEN Chao;CHEN Tao;ZENG Gang(State Key Laboratory of Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049;School of Science,Harbin Institute of Technology(Shenzhen),Shenzhen 518005;School of Mathematics and Physics,Jingchu University of Technology,Jingmen 448000)

机构地区：[1]中国科学院国家空间科学中心空间天气学国家重点实验室,北京100190 [2]中国科学院大学,北京100049 [3]哈尔滨工业大学(深圳)理学院,深圳518005 [4]荆楚理工学院数理学院,荆门448000

出　　处：《空间科学学报》2021年第3期384-391,共8页Chinese Journal of Space Science

基　　金：中国科学院空间科学战略性先导科技专项(XDA17010301,XDA17040102,XDA15052500,XDA15350201);国家自然科学基金项目(41874190,41904148)共同资助。

摘　　要：参考活跃的磁层稳态对流标准,选取了 2001-2017年12个伴随磁层稳态对流的磁暴,研究发现这些磁暴存在以下共性:有长达约10 h的漫长主相;其SYM-H存在一个最小值的平台期,约持续3~10h;这些磁暴发生时,部分环电流持续位于昏侧,其持续时间和行星际磁场分量B_(z)的稳定南向驱动时间相等.此外,这些磁暴发生时,其平台期的环电流离子的寿命为2.4~5.5 h,比一般的大磁暴事件中离子寿命长,且其寿命与平台期长短没有明显关系.伴随稳态对流的大磁暴发生时,环电流离子寿命长,环电流衰减慢,推测是稳态对流期间能量持续而稳定注入磁层导致的.In this paper,12 magnetic storms accompanied with Steady Magnetospheric Convection(SMC)were selected from 2001 to 2017 based on our new criterion.It was found that these magnetic storms have the same characteristics:a long main phase up to about 10 hours;a minimum platform period for each of their SYM-H,which lasts about 3 to 10 hours;when these magnetic storms occur,the partial ring current is located at the dusk-side constantly,and its duration is equal to the stable southward driving time of the B_(z) component of IMF.In addition,the ion loss time during its platform period was calculated,though there were some differences in the lifetime of the ions in different events,the lifetime of the ions in our events is much longer than models.And there is no obvious relationship between the lifetime of the ions and the length of the platform period.Based on our study,the decay of ring current is slowed down as the the SMC event during the magnetic storm brings more energy.

关 键 词：磁层稳态对流 磁暴 环电流 

分 类 号：P353[天文地球—空间物理学]