Accession Number : ADA118805

Title :   Observation of Additional Low-Degree Five-Minute Modes of Solar Oscillation,

Corporate Author : STANFORD UNIV CA INST FOR PLASMA RESEARCH

Personal Author(s) : Scherrer,Philip H ; Wilcox,John M ; Christensen-Dalsgaard,Jorgen ; Gough,Douglas

PDF Url : ADA118805

Report Date : Apr 1982

Pagination or Media Count : 16

Abstract : By measuring the difference between the shifts in the Fe 5124 spectrum line from light integrated from a central circular portion of the solar disk and from an annular portion exterior to it, we have been able to detect high-order solar oscillations with degrees l = 3, 4 and 5. The frequencies of the octupole modes agree well with the values obtained from whole-disk measurements at the South Pole. A least-squares fit of the observed frequencies to values interpolated between and extrapolated from the predictions of a sequence of solar models with different chemical compositions selects a model with a helium abundance somewhat greater than 25 per cent by mass.

Descriptors :   *Sun, *Oscillation, *Spectrometry, Sunlight, Line spectra, Doppler effect

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE