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

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

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

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 1 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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