Variations of the low-degree solar p-mode frequencies for 10 years of GOLF observations

Details Variations of the low-degree solar p-mode frequencies for 10 years of GOLF observations Variations of the low-degree solar p-mode frequencies for 10 years of GOLF observations

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008an....329..490g&link_type=abstract

Astronomische Nachrichten, Vol.329, Issue 5, p.490

Physics

1

Sun: Activity, Sun: Helioseismology, Sun: Oscillations, Sun: Photosphere

Scientific paper

We experiment with a method of measuring the frequency of solar p modes, intended to extend the passband for the variations of the frequency spectrum as high as possible. So far this passband is limited to a fraction of μHz for the classical analysis based on numerical fits of a theoretical line profile to a power spectrum averaged over periods lasting at least several weeks. This limit for the present analysis can be shifted to the mHz range, corresponding to some of the ''5 min'' oscillations, but in this range we use a lower resolution which allows us to separate odd and even p modes. We show an example of the results for long term variations and apply this analysis to search for a modulation of the p-mode frequency spectrum by asymptotic series of solar g modes. A faint signal is found in the analysis of 10 years of GOLF data. This very preliminary result possibly indicates the detection of a small number of g modes of degree l=1. A tentative determination of an observational value of the parameter P_0 follows. P_0 is the scaling factor of the asymptotic series of g modes and is a key data for solar core physics.

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