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

Autor:	D. Fierry Fraillon, T. Appourchaux
Rok vydání:	2001
Předmět:	Physics business.industry Monte Carlo method Autocorrelation Spectral density Astronomy and Astrophysics Function (mathematics) Signal Computational physics Amplitude Optics Quality (physics) Space and Planetary Science Modulation (music) business
Zdroj:	Monthly Notices of the Royal Astronomical Society. 324:1159-1168
ISSN:	1365-2966 0035-8711
DOI:	10.1046/j.1365-8711.2001.04417.x
Popis:	The quality of helioseismological ground-based data strongly depends on the presence of a gap in the observational window. In order to address that problem in the case of full-disc low-degree p-mode velocity measurements, Fossat et al. proposed a gap-filling method called ‘Repetitive music’. The autocorrelation function of the velocity signal shows a correlation of more than 70 per cent at about 4 h because of the quasi-periodicity of p-mode peaks in the Fourier spectrum. The method then consists of filling gaps of the velocity signal with data, when they exist, located 4 h 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 in the power spectrum resulting from the gap-filling method is proposed; its effects on p-mode frequencies, linewidths, amplitudes and asymmetries are discussed as a function of frequency and signal-to-noise ratio.
Databáze:	OpenAIRE
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