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The Local Time and Altitude Dependences of Long-Lived Nonspecular Meteor Echoes With Weak Magnetic Aspect Sensitivity at Low Latitudes

文献类型：期刊论文

作者Wang, Ye1,3; Li, Guozhu1,2,3; Xiao, Zhuowei1
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
出版日期2022-09-01
卷号127期号:9页码:12
ISSN号2169-9380
关键词meteor trail nonfield-aligned irregularities
DOI10.1029/2022JA030458
英文摘要Long-lived nonspecular meteor echoes backscattered from meteor trail nonfield-aligned irregularities (NFAIs) were observed sporadically at high latitudes. In this study, we employ the observations by the all-sky radar of Meteor and ionospheric Irregularity Observation System (MIOS) at Ledong (18.4 degrees N, 109 degrees E) in October 2018, January, April, and July 2019, to investigate the occurrences of meteor trail NFAIs at low latitudes. A deep learning method was developed to identify long-lived meteor echo events with durations of more than 5 s. The long-lived echo events with triangular shape (a typical feature of nonspecular echo) in radar range-time intensity maps were manually distinguished from those with nontriangular shape. Based on the cutoff magnetic aspect angle 12 degrees of nonspecular meteor echoes from field-aligned irregularities (FAIs), the local time and altitude dependences of meteor NFAIs producing long-lived nonspecular echoes are investigated. A total of 846 meteor events due to the backscatters of NFAIs were observed. These events peak around the morning hours, with the beginning (end) altitudes up to (down to) 120 km (similar to 80 km). Their mean heights are about 2-6 km higher than specular meteor echoes. The occurrence of NFAI echoes peaks on certain days that is likely associated with meteor showers. The ratio of the observed NFAI echo to specular echo events is, on average, less than 1 parts per thousand. Possible factors responsible for the NFAIs at low latitudes are discussed based on the current understanding of meteor dust trail.
WOS关键词RADAR ; TRAILS ; IRREGULARITY
资助项目National Natural Science Foundation of China (NSFC)[41727803] ; Project of Stable Support for Youth Team in Basic Research Field, CAS[YSBR-018] ; NSFC[42020104002]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000858991100001
资助机构National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; NSFC ; NSFC ; NSFC ; NSFC ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; NSFC ; NSFC ; NSFC ; NSFC ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; NSFC ; NSFC ; NSFC ; NSFC ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; Project of Stable Support for Youth Team in Basic Research Field, CAS ; NSFC ; NSFC ; NSFC ; NSFC
源URL[http://ir.iggcas.ac.cn/handle/132A11/108348]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Li, Guozhu
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Ye,Li, Guozhu,Xiao, Zhuowei. The Local Time and Altitude Dependences of Long-Lived Nonspecular Meteor Echoes With Weak Magnetic Aspect Sensitivity at Low Latitudes[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2022,127(9):12.
APA Wang, Ye,Li, Guozhu,&Xiao, Zhuowei.(2022).The Local Time and Altitude Dependences of Long-Lived Nonspecular Meteor Echoes With Weak Magnetic Aspect Sensitivity at Low Latitudes.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,127(9),12.
MLA Wang, Ye,et al."The Local Time and Altitude Dependences of Long-Lived Nonspecular Meteor Echoes With Weak Magnetic Aspect Sensitivity at Low Latitudes".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 127.9(2022):12.

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来源：地质与地球物理研究所

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