DOI: 10.1002/2017JA024577
Scopus记录号: 2-s2.0-85042300731
论文题名: Distinguishing Subauroral Ion Drifts From Birkeland Current Boundary Flows
作者: Archer W.E. ; Knudsen D.J.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 1 起始页码: 819
结束页码: 826
语种: 英语
英文关键词: BCBF
; ionosphere
; SAID
; satellite
; subauroral
; Swarm
英文摘要: The Swarm satellites regularly observe latitudinally narrow ion velocity jets exceeding 1 km/s relative to the surrounding plasma at high latitude. Two distinct categories of duskward directed flow channels are observed. The most common are situated between the Region 1 and Region 2 currents, are observed primarily during quiet geomagnetic conditions, and are called Birkeland current boundary flows. During active conditions, a second type of duskward directed ion velocity jet is observed at the equatorward edge of the Region 2 currents, colocated with a sharp poleward directed plasma density gradient, consistent with subauroral ion drifts. Pedersen current and electric field estimates from the Swarm satellites show both types of flow channel to be associated with low height-integrated Pedersen conductivity relative to the surrounding plasma. In this study we show two cases in which the Swarm satellites passed through both types of event on the same orbit, as well as the average ion velocity, field-aligned current, and plasma density surrounding 57 of these events. Some field-aligned current morphologies previously associated with subauroral ion drifts suggest that they may have instead been Birkeland current boundary flows. In this study we provide a comparative description of both phenomena to facilitate their distinction in future studies. ©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/114771
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK, Canada; Department of Physics and Astronomy, University of Calgary, Calgary, AB, Canada
Recommended Citation:
Archer W.E.,Knudsen D.J.. Distinguishing Subauroral Ion Drifts From Birkeland Current Boundary Flows[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)