DOI: 10.1029/2018JA025247
Scopus记录号: 2-s2.0-85050813447
论文题名: Effect of Disturbance Electric Fields on Equatorial Electrojet Over Indian Longitudes
作者: Bulusu J. ; Archana R.K. ; Arora K. ; Chandrasekhar N.P. ; Nagarajan N.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 7 起始页码: 5894
结束页码: 5916
语种: 英语
英文关键词: disturbance dynamo
; equatorial electrojet
; geomagnetic storm
; ionospheric disturbance electric field
; prompt penetration
英文摘要: Prompt penetration (PP) and ionospheric disturbance dynamo (Ddyn) are two expressions of the disturbed electric field developed during a geomagnetic storm in the Earth's ionosphere. Earlier investigations treated these two processes independently over longitudinal separation beyond 20°. In the present study, we investigate the conjunction of these phenomena on equatorial electrojet at 520° longitude separations using daytime magnetic field data from three equatorial sites viz., Minicoy, Vencode, and Campbell Bay and three low-latitude sites viz., Alibag, Hyderabad, and Nabagram, located within 20° longitude over Indian region, during three intense storms (Dst <− 150 nT). We propose a statistical method to identify PP signatures from large data set. In addition, we distinguish the signatures of PP and Ddyn during early recovery phase of intense storms and compute pure Ddyn signature in the late recovery phase. It is seen that the effect of PP is similar at the three equatorial sites for each storm. We find that signatures of Ddyn are amplified at Minicoy and Vencode compared to Campbell Bay, and their magnitude decreases toward low-latitude stations, also reflected in the current vector patterns. Our investigations of intense geomagnetic storms show that PP effect dominates the main phase, followed by a combined effect of PP and Ddyn in the early recovery phase. Eventually the Ddyn signature dominates in the late recovery phase with decreasing amplitudes of Ddyn with increasing time. Such investigations can provide new information about variations in ionospheric parameters. ©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/113642
Appears in Collections: 气候减缓与适应
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作者单位: Magnetic Observatory, CSIR-National Geophysical Research InstituteHyderabad, India
Recommended Citation:
Bulusu J.,Archana R.K.,Arora K.,et al. Effect of Disturbance Electric Fields on Equatorial Electrojet Over Indian Longitudes[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(7)