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Role of convective cell in nonlinear interaction of kinetic Alfvén waves
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Gyrokinetic particle simulations show that electrostatic convective cell (CC) can be generated by kinetic Alfvén waves and plays a dominant role in the nonlinear interactions underlying perpendicular spectral cascade. The CC growth rate increases linearly with the field amplitude of the pump waves and has a small but finite threshold, and decreases with the parallel wavevector. The CC growth is proportional to the perpendicular wavevector when there are two pump waves, but proportional to the square of the perpendicular wavevector when there is a single pump wave.
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