Optimal masks for g-mode detection in MDI velocity data

R. Wachter, J. Schou, A. Kosovichev, P. H. Scherrer

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


We are applying spatial masks to MDI velocity data that are optimized for revealing g-modes in the frequency range 50 through 500 μHz. These masks take into account the horizontal component of g-mode velocity eigenfunctions as well as the time dependent mode projection properties due to the changing solar B angle, and the varying noise level across the solar disk. The solar noise, which is likely to be caused by supergranulation in this frequency range is assumed to be uniformly distributed over the solar surface, consisting of a dominant horizontal component and a small radial component. The resulting time series are examined for possible g-mode candidates and new upper limits for the surface amplitude of g-modes are obtained.

Original languageEnglish (US)
Pages (from-to)115-118
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


  • Oscillations
  • Sun


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