3:00 PM - 3:15 PM
[PEM19-06] An analytical model of radial dependence of temperature in the fast solar wind
Keywords:solar wind, magnetohydrodynamics, thermodynamics
On the other hand, one-fluid magnetohydrodynamic models have also been applied to describe large scale phenomena such as radial dependence of temperature in the solar wind. The specific heat ratio/polytropic index in the MHD model is usually assumed to be constant, although kinetic theories show that specific heat ratios depend on wave characteristics. In the present study, an empirical model of the specific heat ratio in the presence of Alfven waves is applied to describe the radial dependence of solar wind temperature. It is shown that the resultant radial dependence is controlled by some parameters such as temperature ratios and can be in good agreement with the observational studies. The other applications of the empirical model are also discussed.