Cold ion heating at the dayside magnetopause during magnetic reconnection

被引:34
作者
Toledo-Redondo, S. [1 ,2 ]
Andre, M. [1 ]
Vaivads, A. [1 ]
Khotyaintsev, Yu. V. [1 ]
Lavraud, B. [3 ,4 ]
Graham, D. B. [1 ]
Divin, A. [5 ]
Aunai, N. [6 ]
机构
[1] Swedish Inst Space Phys, Uppsala, Sweden
[2] European Space Agcy, ESAC, Sci & Robot Explorat Directorate, Madrid, Spain
[3] Univ Toulouse UPS, Inst Rech Astrophys & Planetol, Toulouse, France
[4] CNRS, UMR 5277, Toulouse, France
[5] St Petersburg State Univ, Fac Phys, Earth Phys Dept, St Petersburg 199034, Russia
[6] Univ Paris 11, CNRS, Ecole Polytech, Plasma Phys Lab, Paris, France
基金
瑞典研究理事会;
关键词
magnetic reconnection; cold ions; magnetopause; EARTHS MAGNETOSPHERE; STATISTICAL-ANALYSIS; PLASMASPHERIC PLUME; CLUSTER; OUTFLOW; PLASMA; ENERGIZATION; ACCELERATION; SPACECRAFT; FIELD;
D O I
10.1002/2015GL067187
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Cold ions of ionospheric origin are known to be present in the magnetospheric side of the Earth's magnetopause. They can be very abundant, with densities up to 100cm(-3). These cold ions can mass load the magnetosphere, changing global parameters of magnetic reconnection, like the Alfven speed or the reconnection rate. In addition they introduce a new length scale related to their gyroradius and kinetic effects which must be accounted for. We report in situ observations of cold ion heating in the separatrix owing to time and space fluctuations of the electric field. When this occurs, the cold ions are preheated before crossing the Hall electric field barrier. However, when this mechanism is not present cold ions can be observed well inside the reconnection exhaust. Our observations suggest that the perpendicular cold ion heating is stronger close to the X line owing to waves and electric field gradients linked to the reconnection process.
引用
收藏
页码:58 / 66
页数:9
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