DOI: 10.1002/2017JA024956
Scopus记录号: 2-s2.0-85044261949
论文题名: The Role of Storm Time Electrodynamics in Suppressing the Equatorial Plasma Bubble Development in the Recovery Phase of a Geomagnetic Storm
作者: Sripathi S. ; Banola S. ; Emperumal K. ; Suneel Kumar B. ; Radicella S.M.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 3 起始页码: 2336
结束页码: 2350
语种: 英语
英文关键词: Es layers
; equatorial plasma bubbles
; F3 layers
; geomagnetic storms
; ionospheric electrodynamics
; ionospheric irregularities
英文摘要: We investigate the role of storm time electrodynamics in suppressing the equatorial plasma bubble (EPB) development using multi-instruments over India during a moderate geomagnetic storm that occurred on 2 October 2013 where Dst minimum reached ~−80 nT. This storm produced unique signatures in the equatorial ionosphere such that equatorial electrojet strength showed signatures of an abrupt increase of its strength to 150 nT and occurrence of episodes of counter electrojet events. During the main phase of the storm, the interplanetary magnetic field Bz is well correlated with the variations in the equatorial electrojet/counter electrojet suggesting the role of undershielding/overshielding electric fields of magnetospheric origin. Further, observations showed the presence of strong F3 layers at multiple times at multiple stations due to undershielding electric field. Interestingly, we observed simultaneous presence of F3 layers and suppression of EPBs in the dusk sector during the recovery phase. While strong EPBs were observed before and after the day of the geomagnetic storm, suppression of the EPBs on the storm day during “spread F season” is intriguing. Our further analysis using low-latitude station, Hyderabad, during the time of prereversal enhancement suggests that intense Esb layers were observed on the storm day but were absent/weak on quiet days. Based on these results, we suggest that the altitude/latitude variation of disturbance dynamo electric fields/disturbance winds may be responsible for simultaneous detection of F3 layers, occurrence of low-latitude Es layers, and suppression of EPBs during the storm day along the sunset terminator. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114358
Appears in Collections: 气候减缓与适应
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作者单位: Indian Institute of Geomagnetism, New Bombay, India; Also at ICTP, Trieste, Italy; Equatorial Geophysical Research Laboratory, Indian Institute of Geomagnetism, Tirunelveli, India; TIFR Balloon Launch Facility, Hyderabad, India; International Centre for Theoretical Physics, Trieste, Italy
Recommended Citation:
Sripathi S.,Banola S.,Emperumal K.,et al. The Role of Storm Time Electrodynamics in Suppressing the Equatorial Plasma Bubble Development in the Recovery Phase of a Geomagnetic Storm[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)