Broadband noise in auroral region is related to an interesting coupled mode, namely, electron-acoustic and kinetic Alfven coupled mode, which are derived from a set of nonlinear equations for low-frequency short wavelength electromagnetic waves in a nonuniform magnetized plasma with sheared plasma flows. In the linear limit it is found that sheared equilibrium flow can be the cause of instability of Alfven-like electromagnetic waves and electron-acoustic waves in magnetospheric measurements. It is also shown that possible stationary solutions of the nonlinear equations without dissipation can be represented in the form of novel electron-acoustic street vortices.
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