What Causesp‐Mode Asymmetry Reversal?

The solar acoustic p-mode line profiles are asymmetric. Velocity spectra havemore power on the low-frequency sides, whereas intensity profiles show theopposite sense of asymmetry. Numerical simulations of the upper convection zonehave resonant p-modes with the same asymmetries and asymmetry reversal as theobserved modes. The temperature and velocity power spectra at optical depth$\tau_{\rm cont} = 1$ have the opposite asymmetry as is observed for theintensity and velocity spectra. At a fixed geometrical depth, corresponding to$<\tau_{\rm cont}>=1$, however, the temperature and velocity spectra have thesame asymmetry. This indicates that the asymmetry reversal is produced byradiative transfer effects and not by correlated noise.Comment: 16 pages, 10 figures, submitted to Astrophysical Journa