Inverse and Forward Alfvenic Kármán Vortex and Magnetospheric Coherent Turbulent Structures in 3D Global MHD Simulations

Magnetospheric coherent structures related to the dynamics of the dayside magnetopause frontier for a northward IMF configuration, are analyzed using global 3D MHD simulations. The main goal is to reach a synthetic scenario on the formation of 3D unstable/stable structures developed in different steps from the dayside to the night side. They are: (i) the Kelvin-Helmholtz (K-H) vortexes are generated along and outside the magnetopause near the dayside region, while other K-H vortexes are generated along and inside the magnetopause;  (ii) Those vortexes frozen to the magnetic field  at the inner sides of the magnetopause at both dusk/dawn sides extend towards the north and south.  They face each other near the north and south ionosphere with counter inverse rotation to form the so-called “inverse” Karman vortexes; (iii) both rows of vortexes are shed off soon from the magnetopause; (iii) these vortexes are unstable in one each row, adjust, and evolve into a marginal stable Kármán vortex street; (iv) these Kármán vortexes soon are reformed into stable longitudinal (stream-wise) coherent vortexes and survive for long time over large distances x~-130 to -140Re in the magnetotail. All these processes lead to the formation of magnetospheric coherent turbulent structures.