A theoretical model of nonlinear Alfven waves in expanding accelerating solar wind plasmas

Yasuhiro NARIYUKI

Presentation information

Oral

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

[P-EM30_30PM2] Plasma Astrophysics: turbulence, transport, nonlinear phenomenon

Wed. Apr 30, 2014 4:15 PM - 5:48 PM 503 (5F)

Convener:*Shuichi Matsukiyo(Department of Earth System Science and Technology, Kyushu University), Tadas Nakamura(Fukui Prefectural University), Chair:Kenichi Nagaoka(National Institute for Fusion Science)

5:15 PM - 5:30 PM

[PEM30-09] A theoretical model of nonlinear Alfven waves in expanding accelerating solar wind plasmas

*Yasuhiro NARIYUKI¹ (1.Faculty of Human Development, University of Toyama)

Keywords:solar wind, Alfvenic turbulence

During about forty years, a lot of studies have discussed the linear and nonlinear dynamics of Alfven waves in solar wind plasmas. Although the uniform plasmas are assumed in most past studies, the effects of the inhomogeneity of background plasmas cannot be negligible in the inner heliosphere, in which several future spacecraft missions are planned. In the present study, a nonlinear evolution equation of envelope-modulated Alfven waves is derived from the magnetohydrodynamic accelerating expanding box model by using the reductive perturbation method. The effects of the acceleration of solar wind to nonlinear evolution are discussed in detail.