Effects of a gap filling method on p-mode parameters

Details Effects of a gap filling method on p-mode parameters Effects of a gap filling method on p-mode parameters

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..347f&link_type=abstract

In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,

Mathematics

Logic

Sun, P-Modes, Gap-Filling

Scientific paper

The quality of helioseismological ground based data strongly depends on the presence of gap in the observational window. In order to address that problem in the case of full disk low p-mode velocity measurements, Fossat et al. (1999) proposed a gap filling method called "Repetitive music". The autocorrelation function of the velocity signal shows a correlation of more than 70% at about 4 hours due to the quasi-periodicity of p-mode peaks in the Fourier spectrum. The method then consists in filling gaps of the velocity signal by data, when they exist, located 4 hours before or after. By using Monte Carlo simulations we assess the effects of the gap filling method on p-mode parameters and their errors. A way to remove the modulation, resulting from the gap-filling method, in the power spectrum is proposed; its effects on p-mode frequencies, linewidths, amplitudes and asymmetries are discussed as a function of both frequency and signal-to-noise ratio of the observational data.

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