scholarly journals Electron thermal effects in standing shear Alfvén waves

2008 ◽  
Vol 113 (A9) ◽  
pp. n/a-n/a ◽  
Author(s):  
P. A. Damiano ◽  
A. N. Wright
Keyword(s):  
Thermal Effects ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Shear Alfven Waves

Anomalous Transport Due to Shear Alfvén Waves

1981 ◽  
Vol 46 (26) ◽  
pp. 1675-1678 ◽  
Author(s):  
W. W. Lee ◽  
M. S. Chance ◽  
H. Okuda
Keyword(s):  
Alfven Waves ◽  
Anomalous Transport ◽  
Alfvén Waves ◽  
Shear Alfven Waves

scholarly journals 2D continuous spectrum of shear Alfvén waves in the presence of a magnetic island

2011 ◽  
Vol 53 (2) ◽  
pp. 025009 ◽  
Author(s):  
Alessandro Biancalani ◽  
Liu Chen ◽  
Francesco Pegoraro ◽  
Fulvio Zonca
Keyword(s):  
Continuous Spectrum ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Magnetic Island ◽  
Shear Alfven Waves

scholarly journals High-n ideal and resistive shear Alfvén waves in tokamaks

1985 ◽  
Vol 161 (1) ◽  
pp. 21-47 ◽  
Author(s):  
C.Z Cheng ◽  
Liu Chen ◽  
M.S Chance
Keyword(s):  
Alfven Waves ◽  
Alfvén Waves ◽  
Shear Alfven Waves

Kinetic simulations of electron response to shear Alfvén waves in magnetospheric plasmas

2004 ◽  
Vol 11 (4) ◽  
pp. 1277-1284 ◽  
Author(s):  
C. E. J. Watt ◽  
R. Rankin ◽  
R. Marchand
Keyword(s):  
Alfven Waves ◽  
Alfvén Waves ◽  
Shear Alfven Waves

Theory of shear Alfvén waves in toroidal plasmas

1995 ◽  
Vol T60 ◽  
pp. 81-90 ◽  
Author(s):  
Liu Chen ◽  
Fulvio Zonca
Keyword(s):  
Alfven Waves ◽  
Alfvén Waves ◽  
Toroidal Plasmas ◽  
Shear Alfven Waves

Theory of Cowling channel formation by reflection of shear Alfven waves from the auroral ionosphere

2013 ◽  
Vol 118 (10) ◽  
pp. 6416-6425 ◽  
Author(s):  
A. Yoshikawa ◽  
O. Amm ◽  
H. Vanhamäki ◽  
A. Nakamizo ◽  
R. Fujii
Keyword(s):  
Alfven Waves ◽  
Alfvén Waves ◽  
Auroral Ionosphere ◽  
Channel Formation ◽  
Shear Alfven Waves

scholarly journals Large-amplitude electromagnetic waves in magnetized relativistic plasmas with temperature

2014 ◽  
Vol 21 (1) ◽  
pp. 217-236 ◽  
Author(s):  
V. Muñoz ◽  
F. A. Asenjo ◽  
M. Domínguez ◽  
R. A. López ◽  
J. A. Valdivia ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thermal Effects ◽  
Large Amplitude ◽  
Plasma Frequency ◽  
Plasma Temperature ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Background Magnetic Field ◽  
Cold Case ◽  
Effective Plasma Frequency

Abstract. Propagation of large-amplitude waves in plasmas is subject to several sources of nonlinearity due to relativistic effects, either when particle quiver velocities in the wave field are large, or when thermal velocities are large due to relativistic temperatures. Wave propagation in these conditions has been studied for decades, due to its interest in several contexts such as pulsar emission models, laser-plasma interaction, and extragalactic jets. For large-amplitude circularly polarized waves propagating along a constant magnetic field, an exact solution of the fluid equations can be found for relativistic temperatures. Relativistic thermal effects produce: (a) a decrease in the effective plasma frequency (thus, waves in the electromagnetic branch can propagate for lower frequencies than in the cold case); and (b) a decrease in the upper frequency cutoff for the Alfvén branch (thus, Alfvén waves are confined to a frequency range that is narrower than in the cold case). It is also found that the Alfvén speed decreases with temperature, being zero for infinite temperature. We have also studied the same system, but based on the relativistic Vlasov equation, to include thermal effects along the direction of propagation. It turns out that kinetic and fluid results are qualitatively consistent, with several quantitative differences. Regarding the electromagnetic branch, the effective plasma frequency is always larger in the kinetic model. Thus, kinetic effects reduce the transparency of the plasma. As to the Alfvén branch, there is a critical, nonzero value of the temperature at which the Alfvén speed is zero. For temperatures above this critical value, the Alfvén branch is suppressed; however, if the background magnetic field increases, then Alfvén waves can propagate for larger temperatures. There are at least two ways in which the above results can be improved. First, nonlinear decays of the electromagnetic wave have been neglected; second, the kinetic treatment considers thermal effects only along the direction of propagation. We have approached the first subject by studying the parametric decays of the exact wave solution found in the context of fluid theory. The dispersion relation of the decays has been solved, showing several resonant and nonresonant instabilities whose dependence on the wave amplitude and plasma temperature has been studied systematically. Regarding the second subject, we are currently performing numerical 1-D particle in cell simulations, a work that is still in progress, although preliminary results are consistent with the analytical ones.

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