Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-09
Astronomy and Astrophysics
Astrophysics
9 pages; accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2008.12942.x
Frequencies, powers and damping rates of the solar p modes are all observed to vary over the 11-yr solar activity cycle. Here, we show that simultaneous variations of these parameters give rise to a subtle cross-talk effect, which we call the ``devil in the detail'', that biases p-mode frequencies estimated from analysis of long power frequency spectra. We also show that the resonant peaks observed in the power frequency spectra show small distortions due to the effect. Most of our paper is devoted to a study of the effect for Sun-as-a-star observations of the low-l p modes. We show that for these data the significance of the effect is marginal. We also touch briefly on the likely l dependence of the effect, and discuss the implications of these results for solar structure inversions.
Chaplin William J.
Eff-Darwich Antonio
Elsworth Yvonne
Jiménez-Reyes Sebastián J.
New Roger
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