A new method for measuring frequencies and splittings of high-degree modes

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

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


A novel peak-bagging method is presented that operates by fitting a theoretical profile (symmetric or asymmetric) to the separate peaks of each multiplet within each unaveraged power spectrum. This new approach allows a separate frequency, width, and amplitude to be obtained for each m value at each value of ℓ, n. Hence, the frequency splittings due to solar rotation for each multiplet can be measured directly. We present some of our initial results obtained with this new method in the range 45 ≤ ℓ ≤ 300, ν ≤ 7 mHz when applied to data from the Michelson Doppler Imager (MDI) onboard the Solar and Heliospheric Observatory (SOHO). Also discussed are some instrumental and methodological problems of high-degree mode measurements.

Original languageEnglish (US)
Pages (from-to)91-94
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number508
StatePublished - Jun 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


  • Methods: Data analysis
  • Sun: Oscillations


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