Fig. 1.

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Spatial turbulent spectrum and turbulent frequency. Left: Spatial turbulent spectrum, Eiso(k), extracted from solar observations (solid blue line). The spectrum comprises roughly three sections, each with a different power law in kα. The dashed orange line shows the best fit of the data to a three-piece-wise power law. The exponents and the boundaries between the three regimes are indicated on the plot. Right: Turbulent frequency ωk ≡ kuk as a function of wavenumber, k, where uk is the typical velocity of the turbulent eddies of inverse size k, given by Eq. (47).
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