Seismological measurement of solar helium abundance

Details Seismological measurement of solar helium abundance Seismological measurement of solar helium abundance

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.349...49v&link_type=abstract

Nature (ISSN 0028-0836), vol. 349, Jan. 3, 1991, p. 49-51. Research supported by 'Zodiac' Scientific Methodological Council.

Mathematics

Logic

68

Abundance, Helioseismology, Helium, Solar Interior, Solar Oscillations, Acoustic Frequencies, Signal To Noise Ratios

Scientific paper

A new approach to the helioseismological determination of the solar helium abundance is described which is based on an analysis of the phase shift of acoustic waves of intermediate-degree modes. From accurate intermediate-mode data a helium mass fraction of 0.25 + or - 0.01 in the solar convection zone is obtained, significantly smaller than the value of 0.27-0.29 predicted by recent solar evolutionary models. The discrepancy indicates either that initial helium abundance was reduced in the envelope by downward diffusion or that the protosolar value was lower than currently accepted.

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