On electron trapping in ion sound waves in turbulent plasma

Physica ◽  
1973 ◽  
Vol 64 (3) ◽  
pp. 608-612
Author(s):  
H. Gratzl
1971 ◽  
Vol 6 (2) ◽  
pp. 309-323 ◽  
Author(s):  
André Rogister

The propagation of low-frequency, large-scale (compared to the ion Larmor frequency Ωi and radius Ri), oblique Alfvén waves in a turbulent plasma is investigated in the framework of kinetic theory. The turbulent field is the statistical average of one-dimensional ion-sound waves of very high frequency and short wavelength (ω ≫ ΩiRe≫ λ). In the absence of resonant particle effects, and to first order in a finite Larmor radius expansion, it is shown that the turbulence can lead either to spatial diffusion (damping) or anti-diffusion (growth), with Bohm scaling, of the low frequency wave. Finite Larmor radius and frequency effects in the propagation of oblique Alfvén waves are simultaneously obtained for arbitrary β plasma; the results can easily be generalized, merely by deforming certain integration contours, to obtain the corresponding Landau decrement.


2014 ◽  
Vol 81 (2) ◽  
Author(s):  
V. N. Pavlenko ◽  
V. G. Panchenko ◽  
N. A. Beloshenko

We investigate the transformation process of longitudinal Langmuir wave into the transverse electromagnetic wave in turbulent plasma subjected to an upper hybrid pump. The case, when upper hybrid pump wave decays into daughter and ion – sound waves is considered. The transformation of the Langmuir wave into electromagnetic one is considered as the possible mechanism of energy radiation from the plasma. It is shown that the frequency of such radiation is chosen to be near double electron Langmuir frequency 2ωpe. These results give us the possibility to explain the nature of radiation from the laboratory and cosmic plasmas (particularly, from the solar crown).


1894 ◽  
Vol 70 (25) ◽  
pp. 395-395
Author(s):  
M. Hopkins
Keyword(s):  

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-867-C7-868
Author(s):  
M. P. Brizhinev ◽  
S. V. Egorov ◽  
B. G. Eremin ◽  
A. V. Kostrov ◽  
A. D. Stepanushkin

2009 ◽  
Vol 12 (6) ◽  
pp. 537-548
Author(s):  
Hamzeh M. Duwairi ◽  
Hazim M. Dwairi

2013 ◽  
Vol 38 (3) ◽  
pp. 335-350 ◽  
Author(s):  
Olexa Piddubniak ◽  
Nadia Piddubniak

Abstract The scattering of plane steady-state sound waves from a viscous fluid-filled thin cylindrical shell weak- ened by a long linear slit and submerged in an ideal fluid is studied. For the description of vibrations of elastic objects the Kirchhoff-Love shell-theory approximation is used. An exact solution of this problem is obtained in the form of series with cylindrical harmonics. The numerical analysis is carried out for a steel shell filled with oil and immersed in seawater. The modules and phases of the scattering amplitudes versus the dimensionless wavenumber of the incident sound wave as well as directivity patterns of the scattered field are investigated taking into consideration the orientation of the slit on the elastic shell surface. The plots obtained show a considerable influence of the slit and viscous fluid filler on the diffraction process.


Sign in / Sign up

Export Citation Format

Share Document