摘要
大尺度行进式大气扰动(LS-TAD)通常被认为起源于极区高纬,本文报道了一起激发于低纬赤道地区、在北半球向高纬传播的LS-TAD观测事例.2002年8月10日07∶30 UT,CHAMP卫星在30°W磁赤道附近观测到显著的大气密度增强,在随后的2个连续轨道上,该密度增强依次出现在北半球更高纬度上,表现出明显的极向位移,是典型的LS-TAD事件.北美洲的2条地面GNSS子午台链也同时记录到了与之相伴随的大尺度行进式电离层扰动(LS-TID)印记.CHAMP卫星和地面GNSS台站在南半球均没有记录到与上述LS-TAD/TID相关联的前序行扰.我们认为该极向传播的LS-TAD事件起源于赤道低纬地区,突然增强的离子垂直漂移是其可能的激发源.
Large-Scale Travelling Atmospheric Disturbance(LS-TAD)is generally believed to originate from the high-latitude auroral areas and then propagate equatorward.In this paper,we report a case of LS-TAD which was stimulated in low-latitude equatorial regions and propagated toward higher latitudes in the Northern hemisphere.CHAMP spacecraft encountered a remarkable neutral density enhancement at equatorial region during its flight over South America about 07∶30 UT on 10^(th) Aug.2002.The density enhancements were detected during the following 3 flyovers at higher latitude in the Northern Hemisphere.Remarkable latitudinal displacement of the density enhancement suggests presence of a LS-TAD.Meanwhile,evidences of Large-Scale Travelling Ionospheric Disturbance(LS-TID),which is generally accompanied by LS-TAD,was recorded by two ground-based GNSS chains.We find no signatures of travelling disturbances in Southern Hemisphere,which are related to the aforementioned LS-TAD/TID.We suggest that the observed LS-TAD was likely to originate from equatorial region,driven by an abrupt increasement of ion vertical drift.
作者
潘建宏
蔡红涛
谷骏
周康俊
罗逸楠
高顺组
PAN JianHong;CAI HongTao;GU Jun;ZHOU KangJun;LUO YiNan;GAO ShunZu(Electronic Information School,Wuhan University,Wuhan 430072,China)
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第3期853-861,共9页
Chinese Journal of Geophysics
基金
科技部重大研发计划(2018YFF01013702)
国家自然科学基金项目(42074185)共同资助。
