MMS Observations of a Compressed Current Sheet: Importance of the Ambipolar Electric Field.

  title={MMS Observations of a Compressed Current Sheet: Importance of the Ambipolar Electric Field.},
  author={Ami M DuBois and Chris Crabtree and Gurudas Ganguli and David M. Malaspina and William E. Amatucci},
  journal={Physical review letters},
  volume={129 10},
Spacecraft data reveal a nonuniform ambipolar electric field transverse to the magnetic field in a thin current sheet in Earth's magnetotail that leads to intense E×B velocity shear and nongyrotropic particle distributions. The E×B drift far exceeds the diamagnetic drift and thus drives observed lower hybrid waves. The shear-driven waves are localized to the magnetic field reversal region and are therefore ideally suited for the anomalous dissipation necessary for reconnection. It also reveals… 

Figures from this paper



Lower-Hybrid Drift Waves Driving Electron Nongyrotropic Heating and Vortical Flows in a Magnetic Reconnection Layer.

Measurements of lower-hybrid drift waves driving electron heating and vortical flows in an electron-scale reconnection layer under a guide field reveal a new regime of electron-wave interaction and how this interaction modifies the electron dynamics in the reconnections layer.

Structure of plasma sheet in magnetotail: Double‐peaked electric current sheet

The structure of the plasma sheet in the distant magnetotail observed by the Geotail satellite is examined. We found that the observed structure of the plasma sheet is often different from the

Current Sheets in the Earth Magnetotail: Plasma and Magnetic Field Structure with Cluster Project Observations

Thin current sheets having kinetic scales are an important plasma structure, where the magnetic energy dissipation and charged particle acceleration are the most effective. It is believed that such

Plasma diffusion across inhomogeneous magnetic fields

This paper reports experimental studies on plasma diffusion across inhomogeneous magnetic fields. Plasma created in a multicusp bucket source is allowed to diffuse across inhomogeneous magnetic

Kinetic Equilibrium of Dipolarization Fronts

The unprecedented high-resolution data from the Magnetospheric Multi-Scale (MMS) satellites is revealing the physics of dipolarization fronts created in the aftermath of magnetic reconnection in

Experimental characterization of broadband electrostatic noise due to plasma compression

For a wide variety of laboratory and space plasma environments, theoretical predictions state that plasmas are unstable to inhomogeneous flows over a very broad frequency range. Such sheared flows

Electron Reconnection in the Magnetopause Current Layer

The electron dynamics within thin current sheets plays a key role both for the process of magnetic reconnection and other energy transfer mechanisms but, from an observational point of view, is not

Perpendicular ion heating by velocity‐shear‐driven waves

Perpendicular ion heating resulting from velocity‐shear‐driven ion‐cyclotron waves has been measured for the first time. The experiment was performed in the Naval Research Laboratory's Space Physics

Plasma response to a varying degree of stress.

Experimental evidence of a seamless transition between three distinct modes in a magnetized plasma with a transverse sheared flow as the ratio of the ion gyroradius to the shear scale length is varied confirms the basic theory that plasma is unstable to transverse velocity shear in a broad frequency and wavelength range.

Velocity‐shear‐driven ion‐cyclotron waves and associated transverse ion heating

Recent sounding rocket experiments, such as SCIFER, AMICIST, and ARCS-4, and satellite data from FAST, Freja, DE-2, and HILAT, provide compelling evidence of a correlation between small-scale spatial