Correlations between plasmapause evolutions and auroral signatures during substorms observed by Chang'e-3 EUV Camera  

作　　者：XiaoXin Zhang Fei He Bo Chen Chao Shen HuaNing Wang 

机构地区：[1]Key Laboratory of Space Weather, National Center for Space Weather, China Meteorological Administration [2]Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences [3]College of Earth Sciences, University of Chinese Academy of Sciences [4]Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences [5]School of Natural Sciences and Humanity, Harbin Institute of Technology Shenzhen Graduate School [6]National Astronomical Observatories, Chinese Academy of Sciences

出　　处：《Earth and Planetary Physics》2017年第1期35-43,共9页地球与行星物理（英文版）

基　　金：supported by National Natural Science Foundation of China (41674155 and 41274147);Youth Innovation Promotion Association of Chinese Academy of Sciences (No.2017258);Key Research Project of Chinese Academy of Sciences:Application Research on the Scientific Data from Chang’E-3 Mission (KGZD-EW-603)

摘　　要：The plasmapause locations determined from the Chang'e-3(CE-3) Extreme Ultraviolet Camera(EUVC) images and the auroral boundaries determined from the Defense Meteorological Satellite Program(DMSP) Special Sensor Ultraviolet Spectrographic Imager(SSUSI) images are used to investigate the plasmaspheric evolutions during substorms. The most important finding is a nightside pointing plasmaspheric plume observed at 23:05 UT on 21 April 2014 under quiet solar wind and geomagnetic conditions, which drifted from the dusk sector. High correlations between the plasmapause evolutions and the auroral signatures exist during substorms. After substorm onset, the plasmapause erosion and the equatorward expansion of the auroral oval occur almost simultaneously in both MLT and UT, and then both the erosion and the expansion propagate westward and eastward. It is suggested that the plasmaspheric erosion and its MLT propagations are induced by the enhanced earthward plasma convection during substorm period, and the substorm dipolarization causes pitch-angle scattering of plasma sheet electrons and the resulting precipitation excites aurora emissions at the same time.The plasmapause locations determined from the Chang’e-3 （CE-3） Extreme Ultraviolet Camera （EUVC） images and the auroralboundaries determined from the Defense Meteorological Satellite Program （DMSP） Special Sensor Ultraviolet Spectrographic Imager（SSUSI） images are used to investigate the plasmaspheric evolutions during substorms. The most important finding is a nightsidepointing plasmaspheric plume observed at 23：05 UT on 21 April 2014 under quiet solar wind and geomagnetic conditions, which driftedfrom the dusk sector. High correlations between the plasmapause evolutions and the auroral signatures exist during substorms. Aftersubstorm onset, the plasmapause erosion and the equatorward expansion of the auroral oval occur almost simultaneously in both MLTand UT, and then both the erosion and the expansion propagate westward and eastward. It is suggested that the plasmaspheric erosionand its MLT propagations are induced by the enhanced earthward plasma convection during substorm period, and the substormdipolarization causes pitch-angle scattering of plasma sheet electrons and the resulting precipitation excites aurora emissions at thesame time.

关 键 词：PLASMASPHERE Chang’e-3 EUVC minimum L Algorithm SUBSTORM 

分 类 号：P352[天文地球—空间物理学]