Inverse of the S/N (top) and its effect on the noise reduction (middle) as well as the estimate of the spectrum of horizontal flows (bottom, as a velocity amplitude per mode) for different approaches. The S/N is clearly scale dependent, in contradiction to assumption (A1). We use ℓ = k R⊙ to convert from wave number into harmonic degree. We do not show results for ℓ = 0 because this corresponds to an arbitrary change in reference frame.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.