ИСТИНА

It is well known that charge-exchange with H atoms can strongly affect the space plasma flows. In this presentation, we will consider two examples of the charge-exchange effects on the plasma flows in the post-shock boundary layers. The first case is an astrosphere where the stellar wind interacts with the partially ionized interstellar medium. We formulate the problem in dimensionless form and will present how the solution depends on dimensionless parameters, and, specifically on Knudsen number that is responsible for the strength of neutral-plasma coupling. The Knudsen number varies from very small values to infinity in our consideration. Another considered problem is the interaction of stellar wind with the neutral atmosphere of non-magnetized plasmas. In this case, the Knudsen number changes significantly with the distance from the planet. Numerical solution of this problem will be presented in the dimensionless form. Specific numerical aspects of the problem will be discussed.