Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-12-20
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
27 pages, 5 figures, to be submitted to ApJ
Scientific paper
In a power spectrum of the Sun's acoustic waves, the p modes have distinctly skewed frequency profiles. Furthermore, the asymmetry is observed to have the opposite sign in power spectra made from line-of-sight velocity and continuum intensity. The asymmetry and its reversal in sign has previously been explained using a combination of mechanisms that involve the acoustic source. A localized acoustic source within an acoustic cavity naturally generates asymmetric profiles through wave interference; however, the sign of the asymmetry due to this mechanism is identical for all observables. The reversal of the asymmetry between velocity and intensity observations has been attributed to the visibility of the source itself (i.e., "correlated noise"). In this paper, I will show that asymmetry generated by a localized source can be interpreted as either a wave interference effect in physical space, or a mode interference effect in spectral space. I advocate a new mode-fitting procedure based on this new interpretation, whereby the complex phases of all the modes determine the mode asymmetries. Further, I suggest that information about the acoustic source function is encapsulated in the amplitude of each mode, and present a scheme by which the source function can be obtained from measured mode amplitudes by standard helioseismic inversion techniques.
No associations
LandOfFree
An Improved Method for Fitting p-Mode Profile Asymmetries does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An Improved Method for Fitting p-Mode Profile Asymmetries, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An Improved Method for Fitting p-Mode Profile Asymmetries will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-58777