Low frequency signal in the GOLF measurements

This paper shows the results obtained using a revisited method to normalize the velocity evaluation extracted from the measurements, for roughly 14 years of GOLF data. For the search of g modes, we calculate the low frequency power spectrum of the signal with 2 different approaches: • The classical...

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Bibliographic Details
Published in:Journal of physics. Conference series 2011-01, Vol.271 (1), p.012050-4
Main Authors: Grec, G, Provost, J, Renaud, C
Format: Article
Language:English
Subjects:
Bullets
Data search
Frequency modulation
Frequency spectrum
Low frequencies
Mathematical models
Physics
Projectiles
Sciences of the Universe
Solar power generation
Spectra
Statistical analysis
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Summary:This paper shows the results obtained using a revisited method to normalize the velocity evaluation extracted from the measurements, for roughly 14 years of GOLF data. For the search of g modes, we calculate the low frequency power spectrum of the signal with 2 different approaches: • The classical calculation of the power spectrum of the velocity signal. • An alternative calculation, extracting first the variations along the time of the p-mode frequencies, then calculating the power spectrum of those frequency modulation [4]. Both spectra are compared to the g-mode frequency spectrum calculated for a solar model. Several observed frequencies are in close agreement with the calculated g modes. A careful statistical analysis of this result should now follow.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/271/1/012050