Journal ArticleDOI
Kinetic effects of Alfvén wave nonlinearity. I. Ponderomotive density fluctuations
TLDR
In this paper, the second-order perturbed distribution function produced by a nonlinear Alfven wave was obtained for the plasma density perturbation associated with an envelope-modulated wave.Abstract:
The Vlasov theory is used to study kinetic corrections to fluid descriptions of Alfven wave nonlinearity. The method is to obtain an expression for the second‐order perturbed distribution function produced by a nonlinear Alfven wave. From this distribution function a kinetically correct expression is obtained for δn, the plasma density perturbation associated with an envelope‐modulated Alfven wave. This kinetic theory result differs substantially from the fluid expression when the plasma β≳1, and the electron and ion temperatures are approximately equal. This result is of interest because density fluctuations are an observationally accessible indicator of wave nonlinearity in solar system Alfven waves. It also will assist in the determination of properties of Alfven waves in the interstellar medium. Finally, this analysis also yields a kinetically correct expression for u, the magnetic field‐aligned component of the plasma fluid velocity. For parallel‐propagating wave packets, this field‐aligned flow is a major or even predominant contributor to the wave nonlinearity. Therefore these results provide a starting point for a general discussion of kinetic effects on Alfven wave nonlinearity.read more
Citations
More filters
An instability of finite amplitude circularly polarized Alfven waves. [in solar wind and corona
TL;DR: In this paper, a finite-amplitude circularly-polarized Alfven wave is shown to be unstable in a MHD fluid, and the wave decays by a four-wave coupling process in which the daughter waves are forward propagating random density and magnetic fluctuations and a backward-propagating magnetic wave.
Journal ArticleDOI
Ion Cyclotron Wave Dissipation in the Solar Corona: The Summed Effect of More than 2000 Ion Species
TL;DR: In this paper, the dissipation of ion cyclotron resonant Alfven waves in the extended solar corona is examined in detail, and the wave damping arising from more than 2000 low-abundance ion species is taken into account.
Journal ArticleDOI
Soliton approach to magnetic holes
TL;DR: In this article, a mechanism for the maintainance of magnetic holes in an equilibrium plasmas was proposed based on a magnetohydrodynamic plasma description including Hall inertia effects and utilizes the well-developed soliton theory of the Derivative Nonlinear Schrodinger Equation (DNLS).
Journal ArticleDOI
Beat, modulational, and decay instabilities of a circularly polarized Alfven wave
TL;DR: In this paper, the authors presented a series of new analytical approximations to the dispersion relation of a circulary polarized low-frequency electomagnetic pump wave propoagating along an ambient magnetic field.
Journal ArticleDOI
Simulation study of the role of ion kinetics in low‐ frequency wave train evolution
TL;DR: In this paper, it was shown that moderate amplitude (delta B/B less than 1/2) wave trains give instabilities and saturated states which differ completely from pure fluid evolution.
References
More filters
Book
Introduction to Plasma Physics
TL;DR: In this article, the authors define the concept of debye shielding and define a set of criteria for plasmas in terms of temperature, debye Shielding, and debye shielding.
Journal ArticleDOI
Introduction to Plasma Physics
TL;DR: In this article, the authors define the concept of debye shielding and define a set of criteria for plasmas in terms of temperature, debye Shielding, and debye shielding.
Journal ArticleDOI
On the modulational instability of hydromagnetic waves parallel to the magnetic field
TL;DR: In this paper, the stability of circularly polarized waves of finite amplitude propagating parallel to the magnetic field is studied. And the authors show that finite amplitude always promotes stability, while amplitude dependent stability conditions for long waves, previously obtained by the author, are confirmed.
Journal ArticleDOI
Modified Nonlinear Schrödinger Equation for Alfvén Waves Propagating along the Magnetic Field in Cold Plasmas
TL;DR: In this article, the basic nonlinear equation which describes the Alfven waves, with small but finite amplitude propagating along the magnetic field in cold plasmas, is derived modifying the reductive perturbation method proposed by Taniuti and Wei.
Journal Article
Modified Nonlinear Schrodinger Equation for Alfven Waves Propagating along the Magnetic Field in Cold Plasmas
TL;DR: In this paper, the basic nonlinear equation which describes the Alfven waves, with small but finite amplitude propagating along the magnetic field in cold plasmas, is derived modifying the reductive perturbation method proposed by Taniuti and Wei.