Japan Geoscience Union Meeting 2016

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Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM17] Space Plasma Physics: Theory and Simulation

Wed. May 25, 2016 9:00 AM - 10:30 AM 302 (3F)

Convener:*Takayuki Umeda(Institute for Space-Earth Environmental Research, Nagoya University), Takanobu Amano(Department of Earth and Planetary Science, University of Tokyo), Yasuhiro Nariyuki(Faculty of Human Development, University of Toyama), Tadas Nakamura(Fukui Prefectural University), Tooru Sugiyama(Japan Agency for Marine-Earth Science and Technology Center for Earth Information Science and Technology), Chair:Yasuhiro Nariyuki(Faculty of Human Development, University of Toyama), Shinji Saito(Graduate School of Science, Nagoya University)

9:45 AM - 10:00 AM

[PEM17-16] Effects of the equilibrium velocity distribution function with the apparent temperature on nonlinear evolution of Alfven waves

*Yasuhiro Nariyuki1 (1.Faculty of Human Development, University of Toyama)

Keywords:Alfven waves, solar wind, MHD

Finite amplitude Alfvenic fluctuations are ubiquitously observed in the solar wind plasma. When we model the low-frequency phenomena of the solar wind plasma using one-fluid magnetohydro-dynamic (MHD) system, the fluctuations and the non-equilibrium components of ions are mixed into the pressure tensor (e.g., Chen et al, 770, 125 (2013); Nariyuki et al, POP, 22, 124502 (2015)). It is noteworthy that the local equilibrium velocity distribution function in the one-fluid MHD system can include the effects of the fluctuations as the apparent temperature. In the present study, nonlinear evolution of Alfven waves with the background (equilibrium) VDF including the apparent temperature is discussed by using the classical theoretical method such as the reductive perturbation method. If the isotropic equilibrium VDF is assumed, the apparent temperature can appear as the linear term in the triple-degenerated derivative nonlinear Schrodinger (TDNLS) system. The relationship between the apparent temperature and the Reynolds stress is also discussed.