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Calculations of spectral darkening and visibility functions for thebrightness oscillations of the Sun resulting from global solar oscillations arepresented. This has been done for a broad range of the visible and infraredcontinuum spectrum. The procedure for the calculations of these functionsincludes the numerical computation of depth-dependent derivatives of theopacity caused by p modes in the photosphere. A radiative-transport code wasused for this purpose to get the disturbances of the opacities from temperatureand density fluctuations. The visibility and darkening functions are obtainedfor adiabatic oscillations under the assumption that the temperaturedisturbances are proportional to the undisturbed temperature of thephotosphere. The latter assumption is the only way to explore any opacityeffects since the eigenfunctions of p-mode oscillations have not been obtainedso far. This investigation reveals that opacity effects have to be taken intoaccount because they dominate the violet and infrared part of the spectrum.Because of this dominance, the visibility functions are negative for thoseparts of the spectrum. Furthermore, the darkening functions show awavelength-dependent change of sign for some wavelengths owing to these opacityeffects. However, the visibility and darkening functions under the assumptionsused contradict the observations of global p-mode oscillations, but it isbeyond doubt that the opacity effects influence the brightness fluctuations ofthe Sun resulting from global oscillations.

Calculation of Spectral Darkening and Visibility Functions for Solar Oscillations