Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh13a0387t&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH13A-0387
Other
7811 Discontinuities (2109), 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7863 Turbulence (4490), 7868 Wave/Wave Interactions
Scientific paper
We present the nonlinear evolution of Alfven waves which propagate at a large distance in the solar wind by Hall MHD simulation. The dissipation processes of Alfven waves are still not well understood due to their strong nonlinearity. The propagation of Alfven waves was investigated by MHD simulations in a long distance (from photosphere to 0.3AU) where the plasma parameters significantly vary [1]. They showed possibilities of the coronal heating and the fast acceleration of the solar wind by the low-frequency Alfven waves. Since they used ideal MHD equations, the dispersive effects of plasma waves which could be important for shorter wave lengths were not considered in their simulations. On the other hand, the nonlinear evolution of Alfven waves with dispersive effects was investigated by Hall MHD simulations [2]. They showed that the soliton solutions of DNLS (Derivative Nonlinear Shrodinger) equation were not stable due to density fluctuations in the frame of the Hall MHD system. In their simulations, the size of simulation region was a few thousands of ion inertial lengths. This size is much smaller than the scale length of the variation of the solar wind parameters. To account for the nonlinear evolution of Alfven waves in the solar wind in a more realistic situation, we adopt one- dimensional radial flux tube of the solar wind and consider a broad simulation region (several solar radii) where the plasma parameters significantly vary. We will show the effects of the dispersion and inhomogeneity on the evolution of the Alfven waves from simulation results. [1] T. K. Suzuki and S. Inutsuka, Solar winds driven by nonlinear low-frequency Alfven waves from the photosphere: Parametric study for fast/slow winds and disappearance of solar winds, JGR 111, A06101 (2006) [2] Buti et al., Nonlinear evolution of Alfvenic wave packets, GRL 25, 13, 2377 (1998)
Ogino Takeshi
Tanaka Sachiko
Umeda Takashi
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