On the formation of postnoon auroral bright spots during weak substorm activity

doi:10.1016/j.asr.2023.12.058

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	On the formation of postnoon auroral bright spots during weak substorm activity
	Zhou, Su 1; Cai YZ(蔡永志)3,4,5 ; Ou, Ping 2; Zhu, Lin 2; Wu, Dan 2
发表期刊	ADVANCES IN SPACE RESEARCH
	2024-03-15
卷号	73 期号:6 页码:3087-3097
DOI	10.1016/j.asr.2023.12.058
产权排序	第3完成单位
收录类别	SCI ; EI
关键词	Postnoon auroral spots Electron acceleration Ionospheric convection Substorm activity
摘要	Postnoon auroral bright spots occurring around 15:00 magnetic local time (MLT) are typically caused by monoenergetic electrons accelerated by quasi-static electric field. In this study, we conduct an analysis of two special auroral spots observed by the Special Sensor Ultraviolet Spectrographic Imager (SSUSI) onboard the Defense Meteorological Satellite Program (DMSP) spacecraft. The first bright spot, observed on 05 June 2010, appears as a south-north aligned arc, while the second case, observed on 19 August 2005, takes the form of a circular patch. They both occurred at the equatorward edge of and are connected to the discrete aurora in the auroral oval. Particle measurements indicate that these two postnoon spots are primarily produced by precipitating electrons experiencing an acceleration process by quasi-static electric field. The average energy and integrated energy flux for the two cases are approximately 1.4 keV (1.5 keV) and 2.3 x 10(12) (1.1 x 10(12)) eV/(cm(2) s sr). It is suggested that the precipitating particles associated with the two cases originate from the boundary plasma sheet located poleward of the central plasma sheet. During the occurrences, the interplanetary magnetic field (IMF) B-y was nearly zero, while the IMF B-z was slightly negative, with values above -3 nT. Additionally, the geomagnetic AL index decreased to -160 and -200 nT, respectively. This indicates a potential relationship between the postnoon auroral spots and week substorm activities. Surprisingly, significant ion flow velocity was found to be nearly orientated with the postnoon spots. This suggests that the convection transports plenty of plasma along the south-north direction, offering sufficient particles for the formation of the postnoon auroral bright spots. (c) 2023 COSPAR. Published by Elsevier B.V. All rights reserved.
资助项目	Guizhou Science and Technology Plan from Guizhou Provincial Department of Science and Technology; Guizhou Provincial Department of Science and Technology
项目资助者	Guizhou Science and Technology Plan from Guizhou Provincial Department of Science and Technology[QKHJC-ZK[2022]YB015] ; Guizhou Provincial Department of Science and Technology
语种	英语
学科领域	天文学
文章类型	Article
出版者	ELSEVIER SCI LTD
出版地	125 London Wall, London, ENGLAND
ISSN	0273-1177
URL	查看原文
WOS记录号	WOS:001180602700001
WOS研究方向	Engineering ; Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences
WOS类目	Engineering, Aerospace ; Astronomy & Astrophysics ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
关键词[WOS]	INTERPLANETARY MAGNETIC-FIELD ; BOUNDARY-LAYER ; LOW-ALTITUDE ; PRECIPITATION ; CONVECTION ; EXCITATION ; STREAMERS
EI入藏号	20240515469664
EI主题词	Flow velocity
EI分类号	481.3.2 Earth Magnetism and Terrestrial Electricity - 631 Fluid Flow - 701.1 Electricity: Basic Concepts and Phenomena - 701.2 Magnetism: Basic Concepts and Phenomena - 932.3 Plasma Physics - 943.2 Mechanical Variables Measurements
引用统计
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/26512
专题	南方基地中国科学院天体结构与演化重点实验室
作者单位	1.School of Science, Guiyang University, Guiyang, China; 2.School of Electronics and Information Engineering, Guiyang University, Guiyang, China; 3.Yunnan Observatories, Chinese Academy of Sciences, Kunming, China; 4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China; 5.International Centre of Supernovae, Yunnan Key Laboratory, Kunming, China
推荐引用方式 GB/T 7714	Zhou, Su,Cai YZ,Ou, Ping,et al. On the formation of postnoon auroral bright spots during weak substorm activity[J]. ADVANCES IN SPACE RESEARCH,2024,73(6):3087-3097.
APA	Zhou, Su,蔡永志,Ou, Ping,Zhu, Lin,&Wu, Dan.(2024).On the formation of postnoon auroral bright spots during weak substorm activity.ADVANCES IN SPACE RESEARCH,73(6),3087-3097.
MLA	Zhou, Su,et al."On the formation of postnoon auroral bright spots during weak substorm activity".ADVANCES IN SPACE RESEARCH 73.6(2024):3087-3097.

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