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This paper presents the numerical verification of an asymptotic analyticalsolution for the nonlinear interaction between counterpropagating Alfven waves,the fundamental building block of astrophysical plasma turbulence. Theanalytical solution, derived in the weak turbulence limit using the equationsof incompressible MHD, is compared to a nonlinear gyrokinetic simulation of anAlfven wave collision. The agreement between these methods signifies that theincompressible solution satisfactorily describes the essential dynamics of thenonlinear energy transfer, even under the weakly collisional plasma conditionsrelevant to many astrophysical environments.

Alfven Wave Collisions, The Fundamental Building Block of Plasma Turbulence II: Numerical Solution