On the formation of postnoon auroral bright spots during weak substorm activity
文献类型：期刊论文
| 作者 | Zhou, Su5; Cai YZ(蔡永志)1,2,3 ; Ou, Ping4; Zhu, Lin4; Wu, Dan4
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| 刊名 | ADVANCES IN SPACE RESEARCH
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| 出版日期 | 2024-03-15 |
| 卷号 | 73期号:6页码:3087-3097 |
| ISSN号 | 0273-1177 |
| 关键词 | Postnoon auroral spots Electron acceleration Ionospheric convection Substorm activity |
| DOI | 10.1016/j.asr.2023.12.058 |
| 产权排序 | 第3完成单位 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| 学科主题 | 天文学 |
| URL标识 | 查看原文 |
| 出版地 | 125 London Wall, London, ENGLAND |
| WOS关键词 | INTERPLANETARY MAGNETIC-FIELD ; BOUNDARY-LAYER ; LOW-ALTITUDE ; PRECIPITATION ; CONVECTION ; EXCITATION ; STREAMERS |
| 资助项目 | Guizhou Science and Technology Plan from Guizhou Provincial Department of Science and Technology; Guizhou Provincial Department of Science and Technology |
| WOS研究方向 | Engineering ; Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCI LTD |
| WOS记录号 | WOS:001180602700001 |
| 资助机构 | Guizhou Science and Technology Plan from Guizhou Provincial Department of Science and Technology[QKHJC-ZK[2022]YB015] ; Guizhou Provincial Department of Science and Technology |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/26512]  |
| 专题 | 云南天文台_丽江天文观测站（南方基地） 云南天文台_中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.International Centre of Supernovae, Yunnan Key Laboratory, Kunming, China 2.Yunnan Observatories, Chinese Academy of Sciences, Kunming, China; 3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China; 4.School of Electronics and Information Engineering, Guiyang University, Guiyang, China; 5.School of Science, Guiyang University, Guiyang, 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. |
入库方式： OAI收割
来源：云南天文台
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