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Signatures of magnetic separatrices at the borders of a crater flux transfer event connected to an active x-line

Signatures of magnetic separatrices at the borders of a crater flux transfer event connected to an active x-line
Signatures of magnetic separatrices at the borders of a crater flux transfer event connected to an active x-line
In this paper, we present Magnetospheric Multiscale (MMS) observations of a flux transfer event (FTE) characterized by a clear signature in the magnetic field magnitude, which shows maximum at the center flanked by two depressions, detected during a period of stable southward interplanetary magnetic field. This class of FTEs are called “crater‐FTEs” and have been suggested to be connected with active reconnection X line. The MMS burst mode data allow the identification of intense fluctuations in the components of the electric field and electron velocity parallel to the magnetic field at the borders of the FTE, which are interpreted as signatures of the magnetic separatrices. In particular, the strong and persistent fluctuations of the parallel electron velocity at the borders of this crater‐FTE reported for the first time in this paper, sustain the field‐aligned current part of the Hall current system along the separatrix layer, and confirm that this FTE is connected with an active reconnection X line. Our observations suggest a stratification of particles inside the reconnection layer, where electrons are flowing toward the X line along the separatrix, are flowing away from the X line along the reconnected field lines adjacent to the separatrices, and more internally ions and electrons are flowing away from the X line with comparable velocities, forming the reconnection jets. This stratification of the reconnection layer forming the FTE, together with the reconnection jet at the trailing edge of the FTE, suggests clearly that this FTE is formed by the single X line generation mechanism.
2169-9380
Trenchi, L.
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Coxon, J.C.
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Fear, R.C.
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Eastwood, J.P.
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Dunlop, M.W.
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Trattner, K. J.
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Gershman, D.J.
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Graham, D.B.
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Khotyaintsev, Y.
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Lavraud, B.
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Trenchi, L.
565a6c2f-9b87-4a3a-a453-ff7cfecbb266
Coxon, J.C.
566baea5-6a30-4855-bde3-a09c115efde4
Fear, R.C.
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Eastwood, J.P.
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Dunlop, M.W.
88ebb777-3e0c-43b2-9684-0ef314439ec5
Trattner, K. J.
16c79a6f-f7b9-4be8-bf69-b64445a72f2c
Gershman, D.J.
00afda5d-e397-4629-b978-12058b1f7c72
Graham, D.B.
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Khotyaintsev, Y.
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Lavraud, B.
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Trenchi, L., Coxon, J.C., Fear, R.C., Eastwood, J.P., Dunlop, M.W., Trattner, K. J., Gershman, D.J., Graham, D.B., Khotyaintsev, Y. and Lavraud, B. (2019) Signatures of magnetic separatrices at the borders of a crater flux transfer event connected to an active x-line. Journal of Geophysical Research: Space Physics. (doi:10.1029/2018JA026126).

Record type: Article

Abstract

In this paper, we present Magnetospheric Multiscale (MMS) observations of a flux transfer event (FTE) characterized by a clear signature in the magnetic field magnitude, which shows maximum at the center flanked by two depressions, detected during a period of stable southward interplanetary magnetic field. This class of FTEs are called “crater‐FTEs” and have been suggested to be connected with active reconnection X line. The MMS burst mode data allow the identification of intense fluctuations in the components of the electric field and electron velocity parallel to the magnetic field at the borders of the FTE, which are interpreted as signatures of the magnetic separatrices. In particular, the strong and persistent fluctuations of the parallel electron velocity at the borders of this crater‐FTE reported for the first time in this paper, sustain the field‐aligned current part of the Hall current system along the separatrix layer, and confirm that this FTE is connected with an active reconnection X line. Our observations suggest a stratification of particles inside the reconnection layer, where electrons are flowing toward the X line along the separatrix, are flowing away from the X line along the reconnected field lines adjacent to the separatrices, and more internally ions and electrons are flowing away from the X line with comparable velocities, forming the reconnection jets. This stratification of the reconnection layer forming the FTE, together with the reconnection jet at the trailing edge of the FTE, suggests clearly that this FTE is formed by the single X line generation mechanism.

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Signatures of Magnetic Separatrices at the Borders of a Crater Flux Transfer Event Connected to an Active X-Line - Accepted Manuscript
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Accepted/In Press date: 28 September 2019
e-pub ahead of print date: 17 October 2019

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Local EPrints ID: 436449
URI: http://eprints.soton.ac.uk/id/eprint/436449
ISSN: 2169-9380
PURE UUID: 8ae07c47-36aa-4e84-b5a3-f926bccb2250
ORCID for J.C. Coxon: ORCID iD orcid.org/0000-0002-0166-6854
ORCID for R.C. Fear: ORCID iD orcid.org/0000-0003-0589-7147

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Date deposited: 11 Dec 2019 17:30
Last modified: 07 Oct 2020 05:10

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Contributors

Author: L. Trenchi
Author: J.C. Coxon ORCID iD
Author: R.C. Fear ORCID iD
Author: J.P. Eastwood
Author: M.W. Dunlop
Author: K. J. Trattner
Author: D.J. Gershman
Author: D.B. Graham
Author: Y. Khotyaintsev
Author: B. Lavraud

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