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We investigate the radial dependence of the spectral break separating theinertial from the dissipation range in power density spectra of interplanetarymagnetic field fluctuations, between $0.42$ and $5.3$ AU, during radialalignments between MESSENGER and WIND for the inner heliosphere and betweenWIND and ULYSSES for the outer heliosphere. We found that the spectral breakmoves to higher and higher frequencies as the heliocentric distance decreases.The radial dependence of the corresponding wavenumber is of the kind$\kappa_b\sim R^{-1.08}$ in good agreement with that of the wavenumber derivedfrom the linear resonance condition for proton cyclotron damping. These resultssupport conclusions from previous studies which suggest that acyclotron-resonant dissipation mechanism must participate into the spectralcascade together with other possible kinetic noncyclotron-resonant mechanisms.

Radial Dependence of the Frequency Break Between Fluid and Kinetic Scales in the Solar Wind Fluctuations