摘要
本文在Hibberd方法的基础上提出了一种分离变化磁场几种主要成分的方法,使用这种方法可以定量地给出每天S_q型变化、D_(st)变化和其他不规则变化。用东亚地磁台链资料进行了检验,结果表明:中低纬度电离层S_q型电流体系的空间结构相当稳定,即使在磁暴期间,该电流体系的结构也无十分明显的变化;磁扰期间复杂的地磁变化主要来自磁层环电流、场向电流和高纬度电离层电流:S_q逐日变化主要表现在幅度上,这反映了电离层发电机电流体系具有较稳定的空间结构和逐日变化的强度。
On the basis of Hibberd's method,a technique is developed for separating main components of the variable geomagnetic field.This technique makes it possible to quantitatively determine the intensity of Sq,Dst and other irregular variations for every day.An examination is made by the use of magnetic data obtained from the stations at the East Asia Meridian Chain.The results show that (1) The spacial structure of the large-scale ionospheric current system at middle and low latitudes is fairly stable,even during disturbed periods; (2) Complicated magnetic variations during disturbed periods are mainly caused by the magnetospheric ring current,field-aligned current and high latitude current; (3) Day-to-day variability of St exhibits mainly in the daily range,that suggests a stable structure and variable intensity of the ionospheric dynamo current system responsible for Sq variation.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第5期497-504,共8页
Chinese Journal of Geophysics
基金
国家自然科学基金
关键词
地球
变化
磁场
电离层
电流体系
Variable geomagnetic field
Sq
Ionospheric current system
Middle and low latitudes
