How much do helioseismological inferences depend upon the assumed reference model?

Details How much do helioseismological inferences depend upon the assumed reference model? How much do helioseismological inferences depend upon the assumed reference model?

1999-09-14

arxiv.org/abs/astro-ph/9909247v1

Astrophys.J.529:1084-1100,2000

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ . Related material at http://www.sns.ias.edu/~jnb

Scientific paper

10.1086/308302

We investigate systematic uncertainties in determining the profiles of the solar sound speed, density, and adiabatic index by helioseismological techniques. We find that rms uncertainties-averaged over the sun of ~ 0.2%-0.4% are contributed to the sound speed profile by each of three sources: 1)the choice of assumed reference model, 2) the width of the inversion kernel, and 3) the measurements errors. The density profile is about an order of magnitude less well determined by the helioseismological measurements. The profile of the adiabatic index is determined to an accuracy of about 0.2% . We find that even relatively crude reference models yield reasonably accurate solar parameters.

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