Identification of solar acoustic modes of low angular degree and low radial order

L. Bertello, F. Varadi, R. K. Ulrich, C. J. Henney, A. G. Kosovichev, R. A. García, S. Turck-Chièze

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

We present evidence for the detection of low radial order (n < 10) acoustic modes of low angular degree, l = 0-2, in the 759 day long Global Oscillations at Low Frequency and Michelson Doppler Imager time series. We used Random-Lag Singular Cross-Spectrum Analysis, which searches for simultaneous oscillatory components in two or more time series. We have determined 11 modes in the range n = 3-9, of which eight modes confirm the previous measurements by Toutain et al. and three modes of l = 0 and n = 3, 5, and 6 are reliably measured for the first time. The errors of frequency determination are also significantly reduced for several previously identified modes. New sound speed inversion results suggest that the effect of inhomogeneous initial composition of the Sun should be included in the standard solar model.

Original languageEnglish (US)
Pages (from-to)L143-L146
JournalAstrophysical Journal
Volume537
Issue number2 PART 2
DOIs
StatePublished - Jul 10 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Methods: data analysis
  • Sun: oscillations

Fingerprint Dive into the research topics of 'Identification of solar acoustic modes of low angular degree and low radial order'. Together they form a unique fingerprint.

Cite this