Imperial College London

Dr Jonathan P. Eastwood

Faculty of Natural SciencesDepartment of Physics

Senior Lecturer



+44 (0)20 7594 8101jonathan.eastwood Website




6M63Blackett LaboratorySouth Kensington Campus






BibTex format

author = {Trenchi, L and Coxon, JC and Fear, RC and Eastwood, JP and Dunlop, MW and Trattner, KJ and Gershman, DJ and Graham, DB and Khotyaintsev, Y and Lavraud, B},
doi = {10.1029/2018ja026126},
journal = {Journal of Geophysical Research: Space Physics},
pages = {8600--8616},
title = {Signatures of magnetic separatrices at the borders of a crater flux transfer event connected to an active Xline},
url = {},
volume = {124},
year = {2019}

RIS format (EndNote, RefMan)

AB - 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 “craterFTEs” 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 craterFTE reported for the first time in this paper, sustain the fieldaligned 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.
AU - Trenchi,L
AU - Coxon,JC
AU - Fear,RC
AU - Eastwood,JP
AU - Dunlop,MW
AU - Trattner,KJ
AU - Gershman,DJ
AU - Graham,DB
AU - Khotyaintsev,Y
AU - Lavraud,B
DO - 10.1029/2018ja026126
EP - 8616
PY - 2019///
SN - 2169-9380
SP - 8600
TI - Signatures of magnetic separatrices at the borders of a crater flux transfer event connected to an active Xline
T2 - Journal of Geophysical Research: Space Physics
UR -
UR -
UR -
VL - 124
ER -