POWER SPECTRUM ANALYSIS OF MOUNT WILSON SOLAR DIAMETER MEASUREMENTS: EVIDENCE FOR SOLAR INTERNAL r-MODE OSCILLATIONS

@article{Sturrock2010POWERSA,
  title={POWER SPECTRUM ANALYSIS OF MOUNT WILSON SOLAR DIAMETER MEASUREMENTS: EVIDENCE FOR SOLAR INTERNAL r-MODE OSCILLATIONS},
  author={Peter Sturrock and L. Bertello},
  journal={The Astrophysical Journal},
  year={2010},
  volume={725},
  pages={492-495}
}
This paper presents a power-spectrum analysis of 39,024 measurements of the solar diameter made at the Mount Wilson Observatory from 1968.670 to 1997.965. This power spectrum contains a number of very strong peaks. We find that eight of these peaks agree closely with the frequencies of r-mode oscillations for a region of the Sun where the sidereal rotation frequency is 12.08 year–1. We estimate that there is less than one chance in 106 of finding this pattern by chance. 
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