Abstract
Using photoelectric observations in the Fe 5576 Å line we obtained line-of-sight velocities at nine different positions on the solar disk, as functions of one horizontal co-ordinate and time. With the help of the Fast Fourier Transform algorithm we calculated two-dimensional power spectra (horizontal wave number and frequency). Special attention was given to the possible existence of horizontal sound waves. We find only very little power in these waves; thus the excitation of the solar atmosphere to oscillations by locally overshooting granules, which should be accompanied by horizontal sound waves with large amplitudes, can play only a minor role.
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Stix, M., Wöhl, H. The center-to-limb variation of the photospheric wave spectrum. Sol Phys 37, 63–74 (1974). https://doi.org/10.1007/BF00157844
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DOI: https://doi.org/10.1007/BF00157844