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The fundamental parametric decay processes of kinetic Alfvén waves (KAW) have been reexamined by employing the nonlinear gyrokinetic equations. Dispersion relations, valid for arbitrary k ⊥ ρi, are derived for parametric decays to KAW and ion sound waves. Here, k ⊥ and ρi are, respectively, the wave number perpendicular to the magnetic field and the ion Larmor radius. It is found that, contrary to the small k ⊥ ρi drift-kinetic results, nonlinear ion Compton scatterings also contributedoi:10.1209/0295-5075/96/35001 fatcat:itnbgxwlgzgtjoumcqp6qrntoa