Distinct MLT asymmetry of auroral kilometric radiation observed by the FAST satellite  

作　　者：JiaWen Tang Sai Zhang FuLiang Xiao HongMing Yang Si Liu YiHua He Chang Yang YuYue Jin ZhouKun Deng Ping Li Archie James Johnston 

机构地区：[1]School of Physics and Electronic Sciences,Changsha University of Science and Technology,Changsha 410114,China [2]Hunan Province Higher Education Key Laboratory of Modeling and Monitoring on the Near-Earth Electromagnetic Environments,Changsha University of Science and Technology,Changsha 410114,China [3]School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China

出　　处：《Earth and Planetary Physics》2025年第1期188-193,共6页地球与行星物理（英文版）

基　　金：supported by the National Natural Science Foundation of China grants 42230209,42374215,42304183,72342001,71931003 and 72061147004;the Scientific Research Fund of Hunan Provincial Education Department grants 21A0212;the Science and Technology Innovation Program of Hunan Province under Grants 2022RC4025,2023JJ50312,2023JJ50010.

摘　　要：Auroral Kilometric Radiation (AKR) is a common radio emission,which can contribute to the magnetosphere-ionosphereatmosphere co u pling.Similar emissions have been observed in all magnetic planet magnetospheres of the solar system.In this study,using observations from the FAST satellite from 30 August 1996 to 9 September 2001,the distribution of AKR in altitude=500-4500 km and invariant latitude (|ILAT|)=60°-80°has been analyzed.63045 AKR samples have been identified with~48%(52%) samples on the dayside (nightside).Of considerable interest,there is a distinct MLT asymmetry with the high occurrence rate in MLT=05-08 and 18-22(02-05 and 12-17) in the northern (southern) hemisphere.The distinct MLT asymmetry is associated with the direction of Bxof the interplaneta ry magnetic field.In addition,the occurrence rate on the nightside clearly increases as the AE^(*) index increases.This study further enriches the information and understanding of AKR in the magnetosphere as well as other similar radio emissions.

关 键 词：asymmetry auroral kilometric radiation interplanetary magnetic field 

分 类 号：P353.6[天文地球—空间物理学]