Role of localized structures and turbulence generation at magnetopause reconnection region

Kinetic Alfvén wave and whistler wave play a key role in the framework of turbulence and reconnection. There are lot of observations of these wave in the magnetopause region. The present work deals with the nonlinear evolution of KAW and a weak whistler wave through the pre-existing magnetic reconnection site. For this study the dynamical evolution equations are derived by taking into account the ponderomotive force driven density modification and magnetic field fluctuations due to shear field modelled by the Harris sheet. Furthermore, these equations have been solved numerically as well as semi-analytically. For numerical integrations we have used the pseudospectral method and finite difference method and for semi-analytically Runge Kutta method. Simulated results have shown the evolution of coherent structures or current sheets, which are capable to energy transfer efficiently. These structures give the signature of turbulence generation. Therefore, the magnetic power spectrum with scaling is also presented and their relevance with the observed spectrum is also pointed out. (author)