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 = {Phan, TD and Eastwood, JP and Shay, MA and Drake, JF and Sonnerup, BUO and Fujimoto, M and Cassak, PA and Ă˜ieroset, M and Burch, JL and Torbert, RB and Rager, AC and Dorelli, JC and Gershman, DJ and Pollock, C and Pyakurel, PS and Haggerty, CC and Khotyaintsev, Y and Lavraud, B and Saito, Y and Oka, M and Ergun, RE and Retino, A and Le, Contel O and Argall, MR and Giles, BL and Moore, TE and Wilder, FD and Strangeway, RJ and Russell, CT and Lindqvist, PA and Magnes, W},
doi = {10.1038/s41586-018-0091-5},
journal = {Nature},
pages = {202--206},
title = {Electron magnetic reconnection without ion coupling in Earth's turbulent magnetosheath},
url = {},
volume = {557},
year = {2018}

RIS format (EndNote, RefMan)

AB - © 2018 Macmillan Publishers Ltd., part of Springer Nature. Magnetic reconnection in current sheets is a magnetic-to-particle energy conversion process that is fundamental to many space and laboratory plasma systems. In the standard model of reconnection, this process occurs in a minuscule electron-scale diffusion region 1,2 . On larger scales, ions couple to the newly reconnected magnetic-field lines and are ejected away from the diffusion region in the form of bi-directional ion jets at the ion Alfvén speed 3-5 . Much of the energy conversion occurs in spatially extended ion exhausts downstream of the diffusion region 6 . In turbulent plasmas, which contain a large number of small-scale current sheets, reconnection has long been suggested to have a major role in the dissipation of turbulent energy at kinetic scales 7-11 . However, evidence for reconnection plasma jetting in small-scale turbulent plasmas has so far been lacking. Here we report observations made in Earth's turbulent magnetosheath region (downstream of the bow shock) of an electron-scale current sheet in which diverging bi-directional super-ion-Alfvénic electron jets, parallel electric fields and enhanced magnetic-to-particle energy conversion were detected. Contrary to the standard model of reconnection, the thin reconnecting current sheet was not embedded in a wider ion-scale current layer and no ion jets were detected. Observations of this and other similar, but unidirectional, electron jet events without signatures of ion reconnection reveal a form of reconnection that can drive turbulent energy transfer and dissipation in electron-scale current sheets without ion coupling.
AU - Phan,TD
AU - Eastwood,JP
AU - Shay,MA
AU - Drake,JF
AU - Sonnerup,BUO
AU - Fujimoto,M
AU - Cassak,PA
AU - Ă˜ieroset,M
AU - Burch,JL
AU - Torbert,RB
AU - Rager,AC
AU - Dorelli,JC
AU - Gershman,DJ
AU - Pollock,C
AU - Pyakurel,PS
AU - Haggerty,CC
AU - Khotyaintsev,Y
AU - Lavraud,B
AU - Saito,Y
AU - Oka,M
AU - Ergun,RE
AU - Retino,A
AU - Le,Contel O
AU - Argall,MR
AU - Giles,BL
AU - Moore,TE
AU - Wilder,FD
AU - Strangeway,RJ
AU - Russell,CT
AU - Lindqvist,PA
AU - Magnes,W
DO - 10.1038/s41586-018-0091-5
EP - 206
PY - 2018///
SN - 0028-0836
SP - 202
TI - Electron magnetic reconnection without ion coupling in Earth's turbulent magnetosheath
T2 - Nature
UR -
UR -
VL - 557
ER -