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We investigated the behavior of the spectral slope of interplanetary magneticfield fluctuations at proton scales for selected high resolution time intervalsfrom WIND and MESSENGER spacecraft at $1$ AU and $0.56$ AU, respectively. Theanalysis was performed within the profile of high speed streams, moving fromfast to slow wind regions. The spectral slope showed a large variabilitybetween $-3.75$ and $-1.75$ and a robust tendency for this parameter to besteeper within the trailing edge where the speed is higher and to be flatterwithin the subsequent slower wind, following a gradual transition between thesetwo states. The value of the spectral index seems to depend firmly on the powerassociated to the fluctuations within the inertial range, higher the powersteeper the slope. Our result support previous analyses suggesting that theremust be some response of the dissipation mechanism to the level of the energytransfer rate along the inertial range.

Spectral Slope Variation at Proton Scales from Fast to Slow Solar Wind