Seismology and Geodesy of the Sun: Low-Frequency Oscillations

Details Seismology and Geodesy of the Sun: Low-Frequency Oscillations Seismology and Geodesy of the Sun: Low-Frequency Oscillations

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pnas...78.1989d&link_type=abstract

Proceedings of the National Academy of Sciences of the United States of America, Volume 78, Issue 4, pp. 1989-1993

Computer Science

2

Scientific paper

The hourly averages of the solar ellipticity measured from June 13 to Sept. 17, 1966, are analyzed for indications of solar oscillations with periods in excess of 2 hr ν <0.5 hr-1. Nothing significant is found for frequencies ν >0.1 hr-1 but for lower frequencies the power spectrum shows a very complex structure containing about 20 strong narrow peaks. The complexity is illusionary. The signal apparently consists of only two frequencies. The complexity is due to aliasing by the window function with its basic 24-hr period, with many observational days missing, and with different numbers of hourly averages for the various observational days. Both signal frequencies are apparently due to odd-degree spherical harmonic oscillations of the sun.

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