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We search for signatures of high-frequency oscillations in the upper solarphotosphere and low chromosphere in the context of acoustic heating of outerstellar atmospheres. We use ultraviolet image sequences of a quiet center-diskarea from the Transition Region and Coronal Explorer (TRACE) mission which weretaken with strict cadence regularity. The latter permits more reliablehigh-frequency diagnosis than in earlier work. Spatial Fourier power maps,spatially averaged coherence and phase-difference spectra, and spatio-temporalk-f decompositions all contain high-frequency features that at first sight seemof considerable intrinsic interest but actually are more likely to representartifacts of different nature. Spatially averaged phase difference measurementprovides the most sensitive diagnostic and indicates the presence of acousticmodulation up to f=20 mHz (periods down to 50 seconds) in internetwork areas.

Dynamics of the solar chromosphere. V. High-frequency modulation in ultraviolet image sequences from TRACE