Effect of line asymmetry on determination of high-degree mode frequencies

Johann Reiter, E. J. Rhodes, A. G. Kosovichev, J. Schou, P. H. Scherrer

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

Accurate measurements of frequencies of high-degree p-modes are important for diagnostics of the structure and dynamics of the upper convective boundary layer, and understanding the nature of the solar-cycle variations detected in low- and medium-degree mode frequencies. Neglecting line asymmetry in the peak-bagging approach may lead to systematic errors in the determination of the mode characteristics and, hence, may affect the results of inversions. Here we demonstrate how the p-mode frequencies are systematically changed in the range of ℓ ≤ 1000, ν ≤ 7 mhz when line asymmetry is taken into account in the fitting of the spectral power peaks. The results reported are based upon spectra that were created from observations obtained from the MDI Full-Disk Program during the 1996 SOHO/MDI Dynamics Run.

Original languageEnglish (US)
Pages (from-to)87-90
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number508
StatePublished - Jun 1 2002
Externally publishedYes
EventSOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO - Davos, Switzerland
Duration: Mar 11 2002Mar 15 2002

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science

Keywords

  • Methods: Data analysis
  • Sun: Oscillations

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