Sawtooth and dune auroras simultaneously driven by waves around the plasmapause  

作　　者：Fei He ZhongHua Yao BinBin Ni Xing Cao ShengYi Ye RuiLong Guo JinXing Li ZhiPeng Ren XinAn Yue YongLiang Zhang Yong Wei XiaoXin Zhang ZuYin Pu 

机构地区：[1]Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [2]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Space Physics,School of Electronic Information,Wuhan University,Wuhan 430072,China [4]Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen 518055,China [5]Institute of Space Sciences,Shandong University,Weihai Shandong 264209,China [6]Department of Atmospheric and Oceanic Sciences,University of California,Los Angeles,California,USA [7]Johns Hopkins University Applied Physics Laboratory,Laurel,Maryland 20723,USA [8]Key Laboratory of Space Weather,National Center for Space Weather,China Meteorological Administration,Beijing 100081,China [9]Institute of Space Physics and Applied Technology,Peking University,Beijing 100871,China

出　　处：《Earth and Planetary Physics》2023年第2期237-246,共10页地球与行星物理（英文版）

基　　金：supported by the National Natural Science Foundation of China(42222408,41931073);supported by the Youth Innovation Promotion Association of the Chinese Academy of Sciences(Y2021027);supported by the Key Research Program of the Institute of Geology&Geophysics,Chinese Academy of Sciences(grant IGGCAS-201904).

摘　　要：The dune aurora,at a scale of~30 kilometers,was reported recently using ground camera.The small-scale dune aurora occurs on the duskside and exhibits a monochromatic oscillation in the auroral emission,implying fundamental energy conversions.However,whether the dune auroras correspond to atmospheric waves or are associated with magnetospheric dynamics should be determined.This paper reports a dune aurora that occurred during a storm;further,we demonstrate that it was the substructure of the sawtooth aurora that was generated by plasmapause surface waves.Conjugate observations in the magnetospheric source region suggest that the exohiss waves,which are periodically modulated by the plasmapause surface wave-excited ultralow frequency wave,might be responsible for the generation of the dune aurora.Most reported dune aurora events have occurred simultaneously with sawtooth auroras,suggesting that both are plasmapause-driven cross-scale auroral structures.

关 键 词：sawtooth aurora dune aurora plasmapause surface wave exohiss 

分 类 号：P427.33[天文地球—大气科学及气象学]