Interaction of solitary waves in longitudinal magnetic field in two-fluid MHD

5th International Conference on "Problems of Mathematical and Theoretical Physics and Mathematical Modelling"

物理学;数学

Gavrikov, M.B.^1 ; Savelyev, V.V.^1,2

Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Miusskaya sq. 4, Moscow

125047, Russia^1

National Research Nuclear University (MEPhI), Kashirskoe highway, 31, Moscow

115409, Russia^2

关键词: Cold plasmas;    Longitudinal magnetic fields;    Model equations;    Natural generalization;    Plasmoids;    Two-fluid;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/788/1/012014/pdf
DOI  :  10.1088/1742-6596/788/1/012014

来源: IOP

【 摘 要 】

The interaction of solitary waves in a model of two-fluid MHD is studied analytically and numerically in the most general case of waves in cold plasma in longitudinal magnetic field. The distinctive feature of this work is the use of "exact" equations rather than an approximate approach (a model equation). Numerical analysis of the solutions of this system of eight partial differential equations shows that the the interaction of solitary waves found in this case is the same (with great accuracy) as that of solitons, i.e., solitary waves that are solutions of various model equations. The solitary waves considered here transport plasmoids with velocities of the order of the Alfven velocity. The main finite-difference method used here for solving the said equations is a natural generalization of the classical two-step Lax-Wendorff scheme.