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Structure of the separatrix region close to a magnetic reconnection X-line: Cluster observations

Retino, A; Vaivads, A; Andre, M; Sahraoui, F; Khotyaintsev, Y; Pickett, JS; Cattaneo, MBB; ... Cornilleau-Wehrlin, N; + view all (2006) Structure of the separatrix region close to a magnetic reconnection X-line: Cluster observations. Geophysical Research Letters , 33 (6) , Article L06101. 10.1029/2005GL024650. Green open access

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Abstract

We use Cluster spacecraft observations to study in detail the structure of a magnetic reconnection separatrix region on the magnetospheric side of the magnetopause about 50 ion inertial lengths away from the X-line. The separatrix region is the region between the magnetic separatrix and the reconnection jet. It is several ion inertial lengths wide and it contains a few subregions showing different features in particle and wave data. One subregion, a density cavity adjacent to the separatrix, has strong electric fields, electron beams and intense wave turbulence. The separatrix region shows structures even at smaller scales, for example, solitary waves at Debye length scale. We describe in detail electron distribution functions and electric field spectra in the separatrix region and we compare them to a numerical simulation. Our observations show that while reconnection is ongoing the separatrix region is highly structured and dynamic in the electric field even if the X-line is up to 50 ion inertial lengths away.

Type: Article
Title: Structure of the separatrix region close to a magnetic reconnection X-line: Cluster observations
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2005GL024650
Publisher version: http://dx.doi.org/10.1029/2005GL024650
Language: English
Additional information: Copyright 2006 by the American Geophysical Union
Keywords: Magnetopause, Waves
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/167819
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