Computer Science – Numerical Analysis
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apl....16...77l&link_type=abstract
Astrophysical Letters, vol. 16, no. 2, 1975, p. 77-79.
Computer Science
Numerical Analysis
Fourier Analysis, Power Spectra, Solar Spectra, Aperiodic Functions, Fourier Transformation, Numerical Analysis, Spatial Distribution, Spectrum Analysis
Scientific paper
The use and limitations of the Fourier transform for analyzing aperiodic signals is discussed with regard to the solar five-minute oscillations. It is argued that peaks in the observational k-omega power spectra do not necessarily represent the true spectral properties of the underlying physical process which is responsible for the data. Alternative interpretations of these peaks are proposed. It is suggested that the loss of phase information in the power spectra renders them unsuitable for determining any horizontal phase propagation characteristics of the oscillations. The lack of spatial periodicity in the oscillations and loss of phase information in the observational k-omega power spectra make a comparison between these spectra and the solutions of the dispersion equation meaningless.
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