How comparison between observed and calculated p-mode eigenfrequencies can give information on the internal structure of the sun

Astronomy and Astrophysics – Astrophysics

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Solar Oscillations, Stellar Structure, Vibration Mode, Frequency Distribution, Stellar Models

Scientific paper

The frequencies of some 400 identified solar p-modes of degree 0 ≤ l ≤ 14 have been compared with the corresponding eigenfrequencies deduced from two standard solar models in order to investigate on the frequency difference δν between observation and theory as a function of frequency ν and degree l. The behaviour of δν(ν, l) permits to have information on the correctness of the internal structure of the Sun. The results of this preliminary analysis show that errors in the computed solar structure mainly arise from the treatment of the surface layers, though small errors in the innermost layers cannot be ruled out. A subsequent comparison between the eigenfrequencies of the two models clarifies the method of this analysis and points out that few per cent changes in sound speed in the deep interior affect the eigenfrequencies by few μHz.

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