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 = {Escoubet, CP and Hwang, K-J and Toledo-Redondo, S and Turc, L and Haaland, SE and Aunai, N and Dargent, J and Eastwood, JP and Fear, RC and Fu, H and Genestreti, KJ and Graham, DB and Khotyaintsev, YV and Lapenta, G and Lavraud, B and Norgren, C and Sibeck, DG and Varsani, A and Berchem, J and Dimmock, AP and Paschmann, G and Dunlop, M and Bogdanova, YV and Roberts, O and Laakso, H and Masson, A and Taylor, MGGT and Kajdi, P and Carr, C and Dandouras, I and Fazakerley, A and Nakamura, R and Burch, JL and Giles, BL and Pollock, C and Russell, CT and Torbert, RB},
doi = {10.3389/fspas.2019.00078},
journal = {Frontiers in Astronomy and Space Sciences},
pages = {1--21},
title = {Cluster and MMS simultaneous observations of magnetosheath high speed jets and their impact on the magnetopause},
url = {},
volume = {6},
year = {2020}

RIS format (EndNote, RefMan)

AB - When the supersonic solar wind encounters the Earth's magnetosphere a shock, called bow shock, is formed and the plasma is decelerated and thermalized in the magnetosheath downstream from the shock. Sometimes, however, due to discontinuities in the solar wind, bow shock ripples or ionized dust clouds carried by the solar wind, high speed jets (HSJs) are observed in the magnetosheath. These HSJs have typically a Vx component larger than 200 km s−1 and their dynamic pressure can be a few times the solar wind dynamic pressure. They are typically observed downstream from the quasi-parallel bow shock and have a typical size around one Earth radius (RE) in XGSE. We use a conjunction of Cluster and MMS, crossing simultaneously the magnetopause, to study the characteristics of these HSJs and their impact on the magnetopause. Over 1 h 15 min interval in the magnetosheath, Cluster observed 21 HSJs. During the same period, MMS observed 12 HSJs and entered the magnetosphere several times. A jet was observed simultaneously by both MMS and Cluster and it is very likely that they were two distinct HSJs. This shows that HSJs are not localized into small regions but could span a region larger than 10 RE, especially when the quasi-parallel shock is covering the entire dayside magnetosphere under radial IMF. During this period, two and six magnetopause crossings were observed, respectively, on Cluster and MMS with a significant angle between the observation and the expected normal deduced from models. The angles observed range between from 11° up to 114°. One inbound magnetopause crossing observed by Cluster (magnetopause moving out at 142 km s−1) was observed simultaneous to an outbound magnetopause crossing observed by MMS (magnetopause moving in at −83 km s−1), showing that the magnetopause can have multiple local indentation places, most likely independent from each other. Under the continuous impacts of HSJs, the magnetopause is deformed significan
AU - Escoubet,CP
AU - Hwang,K-J
AU - Toledo-Redondo,S
AU - Turc,L
AU - Haaland,SE
AU - Aunai,N
AU - Dargent,J
AU - Eastwood,JP
AU - Fear,RC
AU - Fu,H
AU - Genestreti,KJ
AU - Graham,DB
AU - Khotyaintsev,YV
AU - Lapenta,G
AU - Lavraud,B
AU - Norgren,C
AU - Sibeck,DG
AU - Varsani,A
AU - Berchem,J
AU - Dimmock,AP
AU - Paschmann,G
AU - Dunlop,M
AU - Bogdanova,YV
AU - Roberts,O
AU - Laakso,H
AU - Masson,A
AU - Taylor,MGGT
AU - Kajdi,P
AU - Carr,C
AU - Dandouras,I
AU - Fazakerley,A
AU - Nakamura,R
AU - Burch,JL
AU - Giles,BL
AU - Pollock,C
AU - Russell,CT
AU - Torbert,RB
DO - 10.3389/fspas.2019.00078
EP - 21
PY - 2020///
SN - 2296-987X
SP - 1
TI - Cluster and MMS simultaneous observations of magnetosheath high speed jets and their impact on the magnetopause
T2 - Frontiers in Astronomy and Space Sciences
UR -
UR -
UR -
VL - 6
ER -