Lower hybrid waves at the magnetosheath separatrix region

2020 ◽  
Author(s):  
Binbin Tang ◽  
Wenya Li ◽  
Daniel Graham ◽  
Chi Wang ◽  
Yuri Khotyaintsev ◽  
...  
Keyword(s):  
Lower Hybrid ◽  
Particle Diffusion ◽  
Limited Region ◽  
Guide Field ◽  
Out Of Plane ◽  
Hybrid Waves ◽  
Drift Instability ◽  
The Waves ◽  
Lower Hybrid Waves ◽  
Drift Direction

<div>Lower hybrid waves are investigated at the magnetosheath separatrix region in asymmetric guide-field reconnection at Earth’s magnetopause by using MMS observations. These waves are found in a limited region, depending on the density gradient across the separatrix, and they are driven by the lower hybrid drift instability. Properties of these waves are presented: (1) the waves propagate towards the x-line due to the out-of-plane magnetic field, consistent with the electron drift direction; (2) the wave potential is about 20% of the electron temperature. These drift waves effectively produce cross-field particle diffusion, enabling the entry of magnetosheath electrons into the exhaust region.</div>

scholarly journals Particle acceleration in tangential discontinuities by lower hybrid waves

2002 ◽  
Vol 9 (2) ◽  
pp. 121-124 ◽  
Author(s):  
D. Spicer ◽  
R. Bingham ◽  
J. Huba ◽  
V. D. Shapiro
Keyword(s):  
Wave Turbulence ◽  
Lower Hybrid ◽  
Hybrid Wave ◽  
Lower Hybrid Wave ◽  
Electrons And Ions ◽  
Collisionless Reconnection ◽  
Hybrid Waves ◽  
Drift Instability ◽  
The Waves ◽  
Lower Hybrid Waves

Abstract. We consider the role that the lower-hybrid wave turbulence plays in providing the necessary resistivity at collisionless reconnection sights. The mechanism for generating the waves is considered to be the lower-hybrid drift instability. We find that the level of the wave amplitude is sufficient enough to heat and accelerate both electrons and ions.

scholarly journals Resonant three-wave interaction in the presence of suprathermal electron fluxes

2004 ◽  
Vol 22 (6) ◽  
pp. 2171-2179 ◽  
Author(s):  
C. Krafft ◽  
A. Volokitin
Keyword(s):  
Electron Distribution Function ◽  
Wave Interaction ◽  
Magnetized Plasma ◽  
Lower Hybrid ◽  
Particle Interactions ◽  
Wave Interactions ◽  
Suprathermal Electron ◽  
Hybrid Waves ◽  
The Waves ◽  
Lower Hybrid Waves

Abstract. A theoretical and numerical model is presented which describes the nonlinear interaction of lower hybrid waves with a non-equilibrium electron distribution function in a magnetized plasma. The paper presents some relevant examples of numerical simulations which show the nonlinear evolution of a set of three waves interacting at various resonance velocities with a flux of electrons presenting some anisotropy in the parallel velocity distribution (suprathermal tail); in particular, the case when the interactions between the waves are neglected (for sufficiently small waves' amplitudes) is compared to the case when the three waves follow a resonant decay process. A competition between excitation (due to the fan instability with tail electrons or to the bump-in-tail instability at the Landau resonances) and damping processes (involving bulk electrons at the Landau resonances) takes place for each wave, depending on the strength of the wave-wave coupling, on the linear growth rates of the waves and on the modifications of the particles' distribution resulting from the linear and nonlinear wave-particle interactions. It is shown that the energy carried by the suprathermal electron tail is more effectively transfered to lower energy electrons in the presence of wave-wave interactions.

Production of plasma vortices by lower-hybrid waves

1981 ◽  
Vol 26 (2) ◽  
pp. 359-367 ◽  
Author(s):  
M. Y. Yu ◽  
P. K. Shukla ◽  
H. U. Rahman
Keyword(s):  
Plasma Heating ◽  
Finite Amplitude ◽  
Current Drive ◽  
Lower Hybrid ◽  
Magnetic Fluctuations ◽  
Field Diffusion ◽  
Modulational Instabilities ◽  
Hybrid Waves ◽  
Plasma Vortices ◽  
Lower Hybrid Waves

Nonlinear excitation of electrostatic and magnetostatic zero-frequency modes by finite-amplitude lower-hybrid waves is considered. It is found that modulational instabilities can give rise to enhanced plasma vortices. Dispersion relations, as well as analytical expressions for the growth rates, are obtained. The enhanced vortices may cause anomalous cross-field diffusion which can affect plasma confinement in tokamak devices when lower-hybrid waves are used for plasma heating or current drive. We found that magnetic fluctuations associated with the parametrically driven magnetostatic mode are of particular importance in tokamak plasmas.

scholarly journals Lower hybrid waves at the magnetosheath separatrix region

2020 ◽  
Author(s):  
Binbin Tang ◽  
Wenya Li ◽  
Daniel Bruce Graham ◽  
Chi Wang ◽  
Yuri V. Khotyaintsev ◽  
...  
Keyword(s):  
Lower Hybrid ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

Experimental study of non-thermal electron generation by lower hybrid waves in the ASDEX tokamak

1986 ◽  
Vol 26 (8) ◽  
pp. 1106-1111 ◽  
Author(s):  
R. Bartiromo ◽  
M. Hesse ◽  
F.X. Söldner ◽  
R. Burhenn ◽  
G. Fussmann ◽  
...  
Keyword(s):  
Experimental Study ◽  
Lower Hybrid ◽  
Thermal Electron ◽  
Electron Generation ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

RF heating of plasmas by electron Landau damping of lower-hybrid waves

1979 ◽  
Vol 19 (8) ◽  
pp. 1073-1083 ◽  
Author(s):  
V.S. Chan ◽  
S.C. Chiu ◽  
G.E. Guest ◽  
R.W. Harvey ◽  
T. Ohkawa
Keyword(s):  
Landau Damping ◽  
Lower Hybrid ◽  
Rf Heating ◽  
Hybrid Waves ◽  
Lower Hybrid Waves
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