Nonlinear evolution of kinetic Alfvén waves and the turbulent spectra

2008 ◽  
Vol 15 (8) ◽  
pp. 082902 ◽  
Author(s):  
R. P. Sharma ◽  
Sachin Kumar ◽  
H. D. Singh
Keyword(s):  
Nonlinear Evolution ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Turbulent Spectra ◽  
Kinetic Alfvén Waves

Landau damped kinetic Alfvén waves and coronal heating

2009 ◽  
Vol 76 (2) ◽  
pp. 239-246 ◽  
Author(s):  
R. P. SHARMA ◽  
SACHIN KUMAR
Keyword(s):  
Solar Corona ◽  
Initial Conditions ◽  
Planck Equation ◽  
Alfven Waves ◽  
Coronal Heating ◽  
Landau Damping ◽  
Alfvén Waves ◽  
Energetic Electrons ◽  
Turbulent Spectra ◽  
Kinetic Alfvén Waves

AbstractSome recent observations of solar corona suggest that the kinetic Alfvén waves (KAWs) turbulence may be responsible for electron acceleration in solar corona and coronal heating. In the present research, we investigate the turbulent spectra of KAW due to filamentation process in the presence of Landau damping and particle energization. We present here the numerical simulation of model equation governing the nonlinear dynamics of the KAW in the presence of Landau damping. When the ponderomotive and Joule heating nonlinearities are incorporated in the KAW dynamics, the power spectra of the turbulent field is evaluated and used for particle heating. Our results reveal the formation of damped coherent magnetic filamentary structures and the turbulent spectra. The effect of Landau damping is to make the turbulent spectra steeper. Two types of scalings k−3.6 and k−4 have been obtained. We have studied the turbulence with different initial conditions. Using the Fokker–Planck equation with the new velocity space diffusion coefficient, we find the distribution function of energetic electrons in these turbulent structures. Landau damped KAWs may be responsible for the acceleration of the energetic electrons in solar corona and coronal heating.

Nonlinear Evolution of Kinetic Alfvén Waves and Filament Formation

Solar Physics ◽  
2005 ◽  
Vol 229 (2) ◽  
pp. 287-304 ◽  
Author(s):  
M. Malik ◽  
R. P. Sharma
Keyword(s):  
Nonlinear Evolution ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Filament Formation ◽  
Kinetic Alfvén Waves

Nonlinear interaction of obliquely propagating Alfvén waves and kinetic Alfvén waves in solar wind plasmas

2013 ◽  
Vol 79 (5) ◽  
pp. 927-931 ◽  
Author(s):  
NITIN YADAV ◽  
R. P. SHARMA
Keyword(s):  
Solar Wind ◽  
Nonlinear Interaction ◽  
Modulational Instability ◽  
Alfven Waves ◽  
Inertial Range ◽  
Alfven Wave ◽  
Alfvén Waves ◽  
Dynamical Equations ◽  
Turbulent Spectra ◽  
Kinetic Alfvén Waves

AbstractThe nonlinear interaction of kinetic Alfvén waves (KAWs) with other possible plasma modes is considered to be responsible for the observed solar wind turbulent spectrum. In the present paper, a new channel of interaction between a KAW and an obliquely propagating Alfvén wave (AW) has been proposed. The governing dynamical equations are derived and the nonlinear interaction between the two wave modes KAW and AW is studied. The growth rate of modulational instability has been calculated. The nonlinear evolution of KAW filamentation and turbulent spectra has also been discussed. In the inertial range, energy cascade follows nearly Kolmogorov scaling, and after inertial range it follows −2.5 scaling in dispersive range. The obtained results indicate that the proposed mechanism may be responsible for transferring the energy from smaller wavenumbers to larger wavenumbers in the solar wind plasmas. The relevance of the present study with recent Cluster spacecraft observations has also been pointed out.

scholarly journals Alfvén waves in space and astrophysical dusty plasmas

2014 ◽  
Vol 21 (2) ◽  
pp. 405-416 ◽  
Author(s):  
V. Jatenco-Pereira ◽  
A. C.-L. Chian ◽  
N. Rubab
Keyword(s):  
Nonlinear Evolution ◽  
Dusty Plasmas ◽  
Alfven Waves ◽  
Space Plasmas ◽  
Alfvén Waves ◽  
Stellar Winds ◽  
Astrophysical Plasmas ◽  
Star Forming ◽  
Star Forming Regions ◽  
Kinetic Alfvén Waves

Abstract. In this paper, we present some results of previous works on Alfvén waves in a dusty plasma in different astrophysical and space regions by taking into account the effect of superthermal particles on the dispersive characteristics. We show that the presence of dust and superthermal particles sensibly modify the dispersion of Alfvén waves. The competition between different damping processes of kinetic Alfvén waves and Alfvén cyclotron waves is analyzed. The nonlinear evolution of Alfvén waves to chaos is reviewed. Finally, we discuss some applications of Alfvén waves in the auroral region of space plasmas, as well as stellar winds and star-forming regions of astrophysical plasmas.

On ion acoustic turbulence and the nonlinear evolution of kinetic Alfvén waves in aurora

1994 ◽  
Vol 21 (17) ◽  
pp. 1831-1834 ◽  
Author(s):  
J.-E. Wahlund ◽  
P. Louarn ◽  
T. Chust ◽  
H. de Feraudy ◽  
A. Roux ◽  
...  
Keyword(s):  
Nonlinear Evolution ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Ion Acoustic ◽  
Kinetic Alfvén Waves

Stability of solitary kinetic Alfvén waves and ion-acoustic waves in a nonthermal plasma

2000 ◽  
Vol 7 (8) ◽  
pp. 3227-3237 ◽  
Author(s):  
Anup Bandyopadhyay ◽  
K. P. Das
Keyword(s):  
Acoustic Waves ◽  
Nonthermal Plasma ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Ion Acoustic Waves ◽  
Ion Acoustic ◽  
Kinetic Alfvén Waves

Kinetic Alfvén Waves Excited in Two-Dimensional Magnetic Reconnection

2018 ◽  
Vol 123 (8) ◽  
pp. 6655-6669 ◽  
Author(s):  
Hongtao Huang ◽  
Yiqun Yu ◽  
Lei Dai ◽  
Tieyan Wang
Keyword(s):  
Magnetic Reconnection ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Two Dimensional ◽  
Kinetic Alfvén Waves

Velocity shear induced transition of magnetohydrodynamic to kinetic Alfvén waves

2005 ◽  
Vol 12 (5) ◽  
pp. 052110 ◽  
Author(s):  
Yao Chen
Keyword(s):  
Alfven Waves ◽  
Velocity Shear ◽  
Alfvén Waves ◽  
Kinetic Alfvén Waves

Effect of Trapped Superthermal Electrons on Dust Acoustic Kinetic Alfven Waves

2018 ◽  
Author(s):  
Kuldeep Singh ◽  
Yashika Ghai ◽  
N. S. Saini
Keyword(s):  
Alfven Waves ◽  
Alfvén Waves ◽  
Superthermal Electrons ◽  
Dust Acoustic ◽  
Kinetic Alfvén Waves
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