Nonlinear MHD Waves in the Solar Wind Plasma Structures

Details Nonlinear MHD Waves in the Solar Wind Plasma Structures Nonlinear MHD Waves in the Solar Wind Plasma Structures

2001-10-22

arxiv.org/abs/astro-ph/0110494v1

Astronomy and Astrophysics

Astrophysics

Presented at the SOLSPA 2001, Vico Equense, Italy; uses esapub.cls, 4 pages, 7 figures

Scientific paper

We investigate the interaction of magnetohydrodynamic waves with plasma density inhomogeneities. Our numerical study of the full MHD equations shows that: (A) Plasma density inhomogeneities are a source of non-linear generation of transverse compressive waves by a plane Alfven wave, and substantially enhance (by about a factor of 2) the generation of the longitudinal compressive waves. (B) Attained maximal values of the generated transverse compressive waves are insensitive to the strength of the plasma density inhomogeneity and the initial amplitude of the Alfven wave. (C) Efficiency of the generation depends weakly upon the plasma beta parameter. The maximum generated amplitude of transverse compressive wave, up to 32% of the initial Alfven wave amplitude, is reached for about beta=0.5. The results obtained demonstrate that plasma inhomogeneities enhance the efficiency of the non-linear wave coupling.

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