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Distribution of Field-Aligned Electron Events in the High-Altitude Polar Region: Cluster Observations

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Title: Distribution of Field-Aligned Electron Events in the High-Altitude Polar Region: Cluster Observations
Authors: Shi, J
Zhang, Z
Torkar, K
Cheng, Z
Farzakeley, A
Dunlop, M
Carr, C
Item Type: Journal Article
Abstract: Field-aligned electrons (FAEs) are important for the energy transport in the solar wind-magnetosphere-ionosphere coupling. However, the distribution of FAEs and the concerning physical mechanism in different altitudes of the polar region are still unclear. In this paper, data from the Cluster spacecraft were used to study the characteristics of FAEs in high-altitude polar region. We selected FAE events with a flux higher than 3 × 10 8 (cm 2 s) -1 for our analysis. Their distribution was double peaked around the auroral oval. The main peak occurred around the cusp region (magnetic local time (MLT) 0700-1500) which leaned to the dawnside. The other peak appeared in the evening sector with MLT 2100-2300 just before midnight. The durations of the FAE events covered a wide range from 4 to 475 s, with most of the FAE events lasting less than 40 s. The possible physical mechanisms are discussed, namely, that the downward FAEs may consist of decelerated solar wind and reflected up flowing ionospheric electrons in the potential drops, whereas the upward ones may be mirrored solar wind electrons and accelerated ionospheric up flowing electrons.
Issue Date: 14-Nov-2017
Date of Acceptance: 24-Oct-2017
URI: http://hdl.handle.net/10044/1/54634
DOI: https://dx.doi.org/10.1002/2017JA024360
ISSN: 2169-9380
Publisher: Wiley
Start Page: 11245
End Page: 11255
Journal / Book Title: Journal of Geophysical Research: Space Physics
Volume: 122
Issue: 11
Copyright Statement: ©2017 American Geophysical Union. All Rights Reserved. An edited version of this paper was published by AGU. Shi, J., Zhang, Z., Torkar, K., Cheng, Z., Farzakeley, A., Dunlop, M., & Carr, C. (2017). Distribution of field-aligned electron events in the high-altitude polar region: Cluster observations. Journal of Geophysical Research: Space Physics, 122. https://doi.org/10.1002/2017JA024360
Sponsor/Funder: European Space Agency / Estec
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Funder's Grant Number: RES-PSS/NR/039-2008
ST/K001051/1
ST/N002784/1
ST/P003427/1
Publication Status: Published
Appears in Collections:Space and Atmospheric Physics
Physics
Faculty of Natural Sciences



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