Physics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517..223b&link_type=abstract
In: Proceedings of SOHO 12 / GONG+ 2002. Local and global helioseismology: the present and future, 27 October - 1 November 2002,
Physics
1
Sun: Oscillations, Velocity And Intensity Data
Scientific paper
We use the Severino et al. (2001) model for simultaneously fitting four spectra: V (velocity) and I (intensity) power, I-V phase difference and I-V coherence to observational data. We show that this model allows us to reproduce well the observed spectra for l = 15, 20, 25, 30, 35, 40, 45, 50 at low and intermediate frequencies. At high frequencies, the contamination of the spectrum by leaks may prevent fitting the data with the model. A study of the fit parameters as a function of frequency shows the well-known behavior of the mode amplitude and width, but additional modes are needed for a physical interpretation of all fit parameters. Comparing the oscillation parameters from the multi-spectral fitting and from using only the V spectra shows that the oscillation frequency differs by at most 0.1 μHz.
Barban Caroline
Hill F. F.
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