Skip to Main content Skip to Navigation
Journal articles

Magnetic depression and electron transport in an ion-scale flux rope associated with Kelvin–Helmholtz waves

Abstract : We report an ion-scale magnetic flux rope (the size of the flux rope is ∼ 8.5 ion inertial lengths) at the trailing edge of Kelvin–Helmholtz (KH) waves observed by the Magnetospheric Multiscale (MMS) mission on 27 Septem-ber 2016, which is likely generated by multiple X-line re-connection. The currents of this flux rope are highly filamen-tary: in the central flux rope, the current flows are mainly parallel to the magnetic field, supporting a local magnetic field increase at about 7 nT, while at the edges the current filaments are predominantly along the antiparallel direction, which induce an opposing field that causes a significant magnetic depression along the axis direction (> 20 nT), meaning the overall magnetic field of this flux rope is depressed compared to the ambient magnetic field. Thus, this flux rope, accompanied by the plasma thermal pressure enhancement in the center, is referred to as a crater type. Intense lower hybrid drift waves (LHDWs) are found at the magnetospheric edge of the flux rope, and the wave potential is estimated to be ∼ 17 % of the electron temperature. Though LHDWs may be stabilized by the mechanism of electron resonance broadening , these waves could still effectively enable diffusive electron transports in the cross-field direction, corresponding to a local density dip. This indicates LHDWs could play important roles in the evolution of crater flux ropes.
Document type :
Journal articles
Complete list of metadata

Cited literature [53 references]  Display  Hide  Download
Contributor : Gestionnaire Hal-Upmc <>
Submitted on : Wednesday, July 4, 2018 - 2:26:03 PM
Last modification on : Monday, September 13, 2021 - 4:47:46 PM
Long-term archiving on: : Monday, October 1, 2018 - 1:05:17 PM


Publication funded by an institution


Distributed under a Creative Commons Attribution 4.0 International License



Binbin Tang, Wenya Li, Chi Wang, Lei Dai, Yuri Khotyaintsev, et al.. Magnetic depression and electron transport in an ion-scale flux rope associated with Kelvin–Helmholtz waves. Annales Geophysicae, European Geosciences Union, 2018, 36 (3), pp.879-889. ⟨10.5194/angeo-36-879-2018⟩. ⟨hal-01829964⟩



Record views


Files downloads