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At the electron scales the power spectrum of solar-wind magnetic fluctuationscan be highly variable and the dissipation mechanisms of the magnetic energyinto the various particle species is under debate. In this paper we investigatedata from the Cluster mission's STAFF Search Coil magnetometer when the levelof turbulence is sufficiently high that the morphology of the power spectrum atelectron scales can be investigated. The Cluster spacecraft sample a disturbedinterval of plasma where two streams of solar wind interact. Meanwhile, severaldiscontinuities (coherent structures) are seen in the large scale magneticfield, while at small scales several intermittent bursts of wave activity(whistler waves) are present. Several different morphologies of the powerspectrum can be identified: (1) two power laws separated by a break (2) anexponential cutoff near the Taylor shifted electron scales and (3) strongspectral knees at the Taylor shifted electron scales. These differentmorphologies are investigated by using wavelet coherence, showing that in thisinterval a clear break and strong spectral knees are features which areassociated with sporadic quasi parallel propagating whistler waves, even forshort times. On the other hand, when no signatures of whistler waves at 0.1 -0.2fce are present, a clear break is difficult to find and the spectrum isoften more characteristic of a power law with an exponential cutoff.

Variability Of The Magnetic Field Power Spectrum In The Solar Wind At Electron Scales