DOI: 10.1002/2017JA024703
Scopus记录号: 2-s2.0-85042449015
论文题名: On the Nocturnal Downward and Westward Equatorial Ionospheric Plasma Drifts During the 17 March 2015 Geomagnetic Storm
作者: Bagiya M.S. ; Vichare G. ; Sinha A.K. ; Sripathi S.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 2 起始页码: 1618
结束页码: 1626
语种: 英语
英文关键词: 17 March 2015 geomagnetic storm
; disturbance dynamo electric field
; field-aligned integrated Pedersen currents
; storm time distinct bipolar-type equatorial plasma drift variations
英文摘要: During quiet period, the nocturnal equatorial ionospheric plasma drifts eastward in the zonal direction and downward in the vertical direction. This quiet time drift pattern could be understood through dynamo processes in the nighttime equatorial ionosphere. The present case study reports the nocturnal simultaneous occurrence of the vertically downward and zonally westward plasma drifts over the Indian latitudes during the geomagnetic storm of 17 March 2015. After ~17:00 UT (~22:10 local time), the vertical plasma drift became downward and coincided with the westward zonal drift, a rarely observed feature of low latitude plasma drifts. The vertical drift turned upward after ~18:00 UT, while the zonal drift became eastward. We mainly emphasize here the distinct bipolar type variations of vertical and zonal plasma drifts observed around 18:00 UT. We explain the vertical plasma drift in terms of the competing effects between the storm time prompt penetration and disturbance dynamo electric fields. Whereas, the westward drift is attributed to the storm time local electrodynamical changes mainly through the disturbance dynamo field in addition to the vertical Pedersen current arising from the spatial (longitudinal) gradient of the field aligned Pedersen conductivity. ©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/114615
Appears in Collections: 气候减缓与适应
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作者单位: Indian Institute of Geomagnetism (DST), Navi Mumbai, India
Recommended Citation:
Bagiya M.S.,Vichare G.,Sinha A.K.,et al. On the Nocturnal Downward and Westward Equatorial Ionospheric Plasma Drifts During the 17 March 2015 Geomagnetic Storm[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(2)