摘要
世界时间2017年5月27日15:37,地磁场开始发生强烈扰动,达到大磁暴水平.分析显示, 5月23日的日冕物质抛射(CME)在行星际空间形成磁云,其携带的行星际磁场南向分量持续12 h小于-10 nT,最小达到-20.71 nT.长时间强南向磁场分量与磁层顶地磁场相互作用,地磁场发生强扰动, SYM-H指数最小达到-142 nT.全球多个电离层台站监测到电离层扰动.综合电离层测高仪、TIMED-GUVI观测和模式同化TEC数据分析表明,此次电离层暴具有南北半球不对称性,大气成分(N2, O2)扰动很可能是此次电离层负暴的主要原因,赤道向热层风抬升或者O/N2的升高是正暴的可能原因.磁暴期间热层大气密度增加,引起低轨道航天器从29~30日开始轨道衰减速度显著加快,与HPI有很好的对应关系.
Strong geomagnetic storm occurred since 15:37 UT May 27 th,2017.The analysis result showed that,the corona mass ejection(CME)on May 23 rd transformed into magnetic cloud while travelling towards the Earth,the Bzcomponent of which stayed continually below-10 nT,and reached minimum value of-20.71 nT.Under effect of the interaction between the Bzcomponent and the magnetic field in the magnetopause,the minimum value of SYM-H index reached-142 nT.Plenty of the global ionosonde stations observed ionospheric disturbances.Comprehensive study of the ionosonde,TIMED-GUVI observation and TEC assimilation data revealed that,such ionospheric storm showed apparent hemispheric asymmetries,neutral composition(N2,O2)disturbance may be the primary cause of the negative storm,while the positive storm may be caused by the upward effect of equatorward thermospheric wind or the increase of the neutral density ratio O/N2.The enhancement of the thermospheric atmosphere density during the geomagnetic storm caused the significant acceleration of the altitude decay speed of low orbit satellites,which was in good correspondence with the change of the HPI index.
作者
黄为权
万卫星
薛炳森
HUANG WeiQuan;WAN WeiXing;XUE BingSen(University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Key Laboratory of Space Weather,National Center for Space Weather,China Meteorological Administration,Beijing 100081,China)
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2019年第9期1051-1063,共13页
Scientia Sinica(Technologica)
关键词
磁暴
日冕物质抛射
电离层暴
轨道衰减
geomagnetic storm
corona mass ejection
ionosperic storm
orbit decay
