What Causes P-mode Asymmetry Reversal?

Details What Causes P-mode Asymmetry Reversal? What Causes P-mode Asymmetry Reversal?

2002-05-09

arxiv.org/abs/astro-ph/0205141v1

Astrophys.J. 596 (2003) 698-701

Astronomy and Astrophysics

Astrophysics

16 pages, 10 figures, submitted to Astrophysical Journal

Scientific paper

10.1086/377683

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

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