scholarly journals Lower hybrid drift instability at a dipolarization front

2015 ◽  
Vol 120 (2) ◽  
pp. 1124-1132 ◽  
Author(s):  
A. Divin ◽  
Yu. V. Khotyaintsev ◽  
A. Vaivads ◽  
M. André
Keyword(s):  
Lower Hybrid ◽  
Dipolarization Front ◽  
Drift Instability

Statistical Investigation of Fluctuations around the Lower Hybrid Frequency at the Dipolarization Front in the near-Earth Magnetotail

2021 ◽  
Author(s):  
Martin Hosner ◽  
Rumi Nakamura ◽  
Takuma Nakamura ◽  
Evgeny Panov ◽  
Daniel Schmid ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Power Spectra ◽  
Statistical Investigation ◽  
Lower Hybrid ◽  
Wave Power ◽  
Dipolarization Front ◽  
Hybrid Frequency ◽  
Field Fluctuations ◽  
Drift Instability ◽  
Propagation Properties

<p>At the leading edges of reconnection jets in the magnetotail, commonly referred to as Dipolarization Fronts (DF), strong fluctuations in the electric field δE and the magnetic field δB are observed. Recent results from a fully kinetic PIC simulation (Nakamura et al., 2019) demonstrate that a Lower Hybrid Drift Instability-driven (LHDI) disturbance at the DF front region can be responsible for these electric and magnetic field fluctuations. These findings are well in line with an observed event (Liu at al., 2018), comparable to the simulated plasma conditions. However, a general experimental validation under a wider range of conditions yet remains absent. The present work experimentally investigates δE and δB fluctuations for a selection of DF events between July 2017 and September 2018 using Magnetospheric Multiscale (MMS) mission data. Aiming for a statistical approach, the analysis consists of a quantitative evaluation of dynamic wave power spectra of both δE and δB in the lower hybrid frequency range. Furthermore, propagation properties of associated wave structures are analyzed and related to present plasma conditions. Findings include the identification of peak wave power occurrence times relative to the magnetic DF structure and the associated density gradient.</p>

Disturbance of the front region of magnetic reconnection outflow jets due to the lower-hybrid drift instability

2020 ◽  
Author(s):  
Takuma Nakamura ◽  
Takayuki Umeda ◽  
Rumi Nakamura ◽  
Huishan Fu ◽  
Mitsuo Oka
Keyword(s):  
Energy Dissipation ◽  
Magnetic Reconnection ◽  
Solar Flares ◽  
Magnetic Energy ◽  
Substantial Effect ◽  
Lower Hybrid ◽  
Dipolarization Front ◽  
The Earth ◽  
Reconnection Region ◽  
Drift Instability

<p>Magnetic reconnection is a key process in collisionless plasmas that converts magnetic energy to plasma kinetic energies through changes in the magnetic field topology. The energy conversion in this process is believed to cause various explosive phenomena in space such as auroral substorms in the Earth’s magnetosphere and solar flares. Here, a 3D fully kinetic simulation shows that the lower-hybrid drift instability (LHDI) disturbs the front of magnetic reconnection outflow jets and additionally causes the energy dissipation. The peak energy dissipation at the jet fronts is comparable to the values seen near the center of the reconnection region where the topology change during reconnection occurs, indicating that the LHDI turbulence has a substantial effect on the energetics of reconnection. The result is well consistent with a disturbance observed at the dipolarization front (DF) in the Earth’s magnetotail by the Magnetospheric Multiscale (MMS) mission. A fully kinetic dispersion relation solver, validated by the MMS observations, further predicts that the disturbance of the reconnection jet front could occur over different parameter regimes in space plasmas including the Earth’s DF and solar flares.</p>

Growth of the lower hybrid drift instability in the plume of a magnetically shielded Hall thruster

2021 ◽  
Vol 129 (19) ◽  
pp. 193301
Author(s):  
Ioannis G. Mikellides ◽  
Alejandro Lopez Ortega
Keyword(s):  
Hall Thruster ◽  
Lower Hybrid ◽  
Drift Instability

Obliquely propagating generalized lower-hybrid drift instability with nonlocal two-fluid theory in current sheet equilibrium

2010 ◽  
Vol 17 (10) ◽  
pp. 102102 ◽  
Author(s):  
Dandan Zou ◽  
Weihong Yang ◽  
Yinhua Chen ◽  
P. H. Yoon
Keyword(s):  
Current Sheet ◽  
Lower Hybrid ◽  
Fluid Theory ◽  
Drift Instability ◽  
Two Fluid

scholarly journals Anomalous Transport in Current Sheets

1985 ◽  
Vol 107 ◽  
pp. 315-328
Author(s):  
J. D. Huba
Keyword(s):  
Anomalous Transport ◽  
Lower Hybrid ◽  
Diffusion Region ◽  
Transport Mechanisms ◽  
Current Sheets ◽  
Nonlinear Properties ◽  
Acoustic Instability ◽  
Ion Acoustic ◽  
Linear And Nonlinear ◽  
Drift Instability

A review of several microinstabilities that have been suggested as possible anomalous transport mechanisms in current sheets is presented. The specific application is to a ‘field reversed plasma’ which is relevant to the so-called ‘diffusion region’ of a reconnection process. The linear and nonlinear properties of the modes are discussed, and each mode is assessed as to its importance in reconnection processes based upon these properties. It is concluded that the two most relevant instabilities are the ion acoustic instability and the lower-hybrid-drift instability. However, each instability has limitations as far as reconnection is concerned, and more research is needed in this area.

scholarly journals Evolution of the lower hybrid drift instability at reconnection jet front

2015 ◽  
Vol 120 (4) ◽  
pp. 2675-2690 ◽  
Author(s):  
A. Divin ◽  
Yu. V. Khotyaintsev ◽  
A. Vaivads ◽  
M. André ◽  
S. Markidis ◽  
...  
Keyword(s):  
Lower Hybrid ◽  
Drift Instability
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