Numerical Simulation to Study the Nonlinear Interaction Between Slow Magnetosonic Wave and Ion Acoustic Wave in Solar Wind Plasmas

We have studied the nonlinear interaction between slow magnetosonic waves (SMSW) and ion acoustic waves (IAW) by numerical simulation. Our model assumes that the SMSW as a pump wave and that its density perturbation is due to IAW. If the ponderomotive force components of SMSW are included in the dynamics of IAW, the governing equations for IAW and SMSW are formulated as coupled nonlinear equations. We carried out numerical simulations of these coupled equations and evaluated the localized filamentary structures and the magnetic power spectrum for an angle of propagation θ=70^∘. These intense localized structures and power spectra satisfy the scaling law, k^−s (2≤s≤4), in the dispersive range, which may contribute to the acceleration of particles in the solar wind.