Abstract


  NONLINEAR INTERACTION OF 3D KINETIC ALFVEN WAVE AND QUASI-LONGITUDINAL WHISTLER WAVE IN MAGNETIZED PLASMA

  R. Rai, Indian Institute of Technology, rajanraj.rai7@gmail.com

Plasma is an ubiquitous form of matter in the universe and so is the ubiquity of turbulence in space and astrophysical plasmas. Most of the astrophysical objects are in the plasma state. Various plasma theories are being used to explain the different astrophysical phenomena. In this work, we have investigated the coupling of 3D kinetic Alfvén wave (KAW) and obliquely propagating (with respect to the ambient magnetic field) weak whistler wave, in a magnetized plasma. This coupling has been studied numerically to study the transient evolution of localized structures of 3D KAW and whistler wave. The nonlinearity arises due to ponderomotive effects associated with 3D KAW, consequently, the background density gets modified. The weak whistler wave propagating in this modified density gets localized and amplified. The typical transverse scale size of localized 3D KAW is of the order of ion gyroradius and that of the trapped whistler is even less than that. The relevance of the results is also pointed out for solar wind plasmas and magnetospheric plasmas