Velocity shear generated Alfvén waves in electron–positron plasmas

1996 ◽  
Vol 3 (10) ◽  
pp. 3545-3555 ◽  
Author(s):  
Andria D. Rogava ◽  
S. M. Mahajan ◽  
Vazha I. Berezhiani
Keyword(s):  
Alfven Waves ◽  
Velocity Shear ◽  
Alfvén Waves ◽  
Electron Positron

The effect of microscale random Alfvén waves on the propagation of large-scale Alfvén waves

1983 ◽  
Vol 29 (2) ◽  
pp. 243-253 ◽  
Author(s):  
Tomikazu Namikawa ◽  
Hiromitsu Hamabata
Keyword(s):  
Large Scale ◽  
Ponderomotive Force ◽  
Collisionless Plasma ◽  
Alfven Waves ◽  
Velocity Fields ◽  
Velocity Shear ◽  
Alfvén Waves ◽  
Spectrum Function ◽  
Spatial Derivatives ◽  
Derivatives Of

The ponderomotive force generated by random Alfvén waves in a collisionless plasma is evaluated taking into account mean magnetic and velocity shear and is expressed as a series involving spatial derivatives of mean magnetic and velocity fields whose coefficients are associated with the helicity spectrum function of random velocity field. The effect of microscale random Alfvén waves through ponderomotive and mean electromotive forces generated by them on the propagation of large-scale Alfvén waves is also investigated.

scholarly journals Self-modulation of nonlinear Alfvén waves in a strongly magnetized relativistic electron-positron plasma

2013 ◽  
Vol 88 (2) ◽  
Author(s):  
Rodrigo A. López ◽  
Felipe A. Asenjo ◽  
Víctor Muñoz ◽  
Abraham C.-L. Chian ◽  
J. A. Valdivia
Keyword(s):  
Relativistic Electron ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Electron Positron

Resonant interactions between nonlinear Alfvén waves in electron–positron plasmas

1999 ◽  
Vol 6 (4) ◽  
pp. 1369-1370
Author(s):  
Rodica Ciurea-Borcia ◽  
Margareta Ignat
Keyword(s):  
Alfven Waves ◽  
Alfvén Waves ◽  
Resonant Interactions ◽  
Electron Positron

scholarly journals FRB coherent emission from decay of Alfvén waves

2020 ◽  
Vol 494 (2) ◽  
pp. 2385-2395 ◽  
Author(s):  
Pawan Kumar ◽  
Željka Bošnjak
Keyword(s):  
Magnetic Field ◽  
Wave Packet ◽  
Electric Field ◽  
Static Magnetic Field ◽  
Strong Electric Field ◽  
Alfven Waves ◽  
Alfven Wave ◽  
Alfvén Waves ◽  
Radio Waves ◽  
Electron Positron

ABSTRACT We present a model for fast radio bursts (FRBs) where a large-amplitude Alfvén wave packet is launched by a disturbance near the surface of a magnetar, and a substantial fraction of the wave energy is converted to coherent radio waves at a distance of a few tens of neutron star radii. The wave amplitude at the magnetar surface should be about 1011 G in order to produce an FRB of isotropic luminosity 1044 erg s−1. An electric current along the static magnetic field is required by Alfvén waves with non-zero component of transverse wave vector. The current is supplied by counter-streaming electron–positron pairs, which have to move at nearly the speed of light at larger radii as the plasma density decreases with distance from the magnetar surface. The counter-streaming pairs are subject to two-stream instability, which leads to formation of particle bunches of size of the order of c/ωp, where ωp is the plasma frequency. A strong electric field develops along the static magnetic field when the wave packet arrives at a radius where electron–positron density is insufficient to supply the current required by the wave. The electric field accelerates particle bunches along the curved magnetic field lines, and that produces the coherent FRB radiation. We provide a number of predictions of this model.

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