Optimal masks for g-mode detection in MIDI velocity data

Details Optimal masks for g-mode detection in MIDI velocity data Optimal masks for g-mode detection in MIDI velocity data

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508..115w&link_type=abstract

In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze

Computer Science

2

Sun: Oscillations

Scientific paper

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.

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