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Kinetic Alfven wave turbulence in solar wind is considered and it is shownthat non-Maxwellian electron distribution function has a significant effect onthe dynamics of the solar wind plasmas. Linear Landau damping leads to theformation of a plateau in the parallel electron distribution function whichdiminishes the Landau damping rate significantly. Nonlinear scattering of wavesby plasma particles is generalized to short wavelengths and it is found thatfor the solar wind parameters this scattering is the dominant process ascompared to three wave decay and coalescence in the wave vector range .Incorporation of these effects lead to the steepening of the wave spectrumbetween the inertial and the dissipation ranges with a spectral index between 2and 3. This region can be labeled as the scattering range. Such steepening hasbeen observed in the solar wind plasmas.

Linear and Non-Linear Landau Resonance of Kinetic Alfv\'en Waves: Consequences for Electron Distribution and Wave Spectrum in the Solar Wind