1999/08/23 by M. C. Rabello‐Soares, M. C. Rabello-Soares, Rabello-Soares, M. C. +7
Earth and Planetary Sciences · Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9908250
9 pages, 10 figures. Accepted for publication on A&A
arxiv created 1999/08/23 · openalex publication_date 1999/08/23 · arxiv updated 2009/12/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
Despite the strong evidence that the peaks in the spectrum of solar\noscillations are asymmetric, most determinations of mode frequencies have been\nbased on fits of symmetric Lorentzian profiles to the Fourier or power spectra\nof oscillation time strings. The systematic errors resulting from neglecting\nthe line asymmetry could have serious effects on inversions for the solar\ninternal structure and rotation. Here we analyse artificial data based on\nsimple models of the intrinsic line asymmetry, using GONG mode parameters with\nasymmetries found by one of us (Rosenthal citerosenthal2). By fitting\nLorentzians to the resulting spectra, we estimate the likely properties of the\nerrors introduced in the frequencies. We discuss whether these frequency shifts\nhave a form similar to the near-surface layers uncertainties and are therefore\nsuppressed in the solar structure inversion. We also estimate directly their\ncontribution, if any, in the solar sound-speed and density determinations using\nthe SOLA technique.\n