Hydromagnetic waves driven by velocity shear instability in the magnetospheric boundary layer

Computer Science

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Atmospheric Boundary Layer, Magnetohydrodynamic Waves, Magnetospheric Instability, Plasma Oscillations, Solar Wind, Geomagnetic Pulsations, Group Velocity, High Temperature Plasmas, Plasma Compression, Plasma Equilibrium, Shear Stress

Scientific paper

A theoretical model is proposed to explain the cause of the HM-waves observed in the magnetospheric boundary layer and, in particular, to find out whether HM-waves driven by the velocity shear instability can grow in this layer where the bulk flow has a strong velocity shear. The model ignores inhomogeneities in the ambient field and the mass density which occur at the magnetopause on about the same scale as that of the velocity shear. It is shown that velocity shear instability in the magnetospheric boundary layer is the most probable source of long-period (T equal to or greater than 40 sec) magnetic pulsations.

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