OICC Press Journal of Theoretical and Applied Physics 2251-7235 18 1 2024 01 01 Influence of varying magnetic field on ion acoustic solitary waves in dissipative plasma 10.57647/J.JTAP.2024.1801.05 EN H. R. Pakzad Department of Physics, Bojnourd Branch, Islamic Azad University, Bojnourd, Iran U. N. Ghosh Department of Mathematics, K. K. M. College, Jamui, A Constituent unit of Munger University, Bihar-811307 India Journal Article 2024 01 01 In this paper, we study obliquely propagating of small amplitude ion acoustic waves (IAWs) in non-relativistic cold plasma in which the ions are viscous fluid, electrons distribution is Maxwellian and external magnetic field varies in space. Using the reductive perturbation method, a nonlinear equation which complies with Korteweg–de Vries–Burgers (KdVB) equation is derived for this model. It is shown that a new effective dissipative which depends on the ion kinematic viscosity and varying in the magnetic field is appeared in the plasma. We show that the complete set of equations, by considering the varying magnetic field and viscosity effect, create IA waves which radiate energy as oscillatory shock wave during their travelling in the medium.