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题名: Dynamics of ionospheric disturbances during the 17-19 March 2015 geomagnetic storm over East Asia
作者: Polekh, N.; Zolotukhina, N.; Kurkin, V.; Zherebtsov, G.; Shi, J.; Wang, G.; Wang, Z.
作者部门: 空间科学部
通讯作者: Polekh, N (reprint author), RAS, SB, Inst Solar Terr Phys, Irkutsk, Russia.
关键词: Magnetic storm ; Critical frequency ; Total electron content ; Storm-related ionospheric disturbances
刊名: ADVANCES IN SPACE RESEARCH
ISSN号: 0273-1177
出版日期: 2017
卷号: 60, 期号:11, 页码:2464-2476
收录类别: SCI ; EI
项目资助者: Russian Foundation for Basic Research [16-55-53003] ; RF President Grant of Public Support for RF Leading Scientific Schools [NSh-6894.2016.5]
英文摘要: Based on vertical sounding data from nine ionosondes located at 19-66 degrees N, 100-130 degrees E we investigated the latitude-temporal dynamics of ionospheric disturbances during the 17-19 March 2015 severe two-step geomagnetic storm, and compared it with temporal dynamics of total electron content (TEC) profiles along 120 degrees E. The phenomena that accompanied the main and early recovery storm phases were in particular focused on in this study. The distinct storm-related ionospheric disturbances began 2.5, 4 and 5 h after onset of the storm main phase at subauroral, middle and low latitudes, respectively. To clarify the main mechanisms causing the disturbances at different latitudes we compared the changes in ionospheric parameters and TEC profiles with changes in the northern polar cap index and geomagnetic field in the vicinity of 120 degrees E. The equatorward shift of the main ionospheric trough (MIT) and diffuse precipitations zone accompanied by an increase in precipitating particle flux was found to have a substantial influence on the subauroral ionosphere during the main and early recovery phases. The thermosphere Joule heating due to westward and" polarized jets led to an increase in neutral wind velocity and generation of disturbed dynamo electric field. The strengthened wind was the main reason of the positive ionospheric disturbance observed at middle latitudes in the evening on 17 March. The further enhancement of magnetospheric convection caused the displacement of MIT and its associated negative ionospheric disturbance to middle latitudes. At low latitudes superposition of prompt penetration and disturbed dynamo electric fields play the decisive role in the ionosphere behavior till the end of the early recovery phase. (C) 2017 COSPAR. Published by Elsevier Ltd. All rights reserved.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6112
Appears in Collections:空间科学部_期刊论文

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