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Published June 28, 1990 | public
Journal Article

Solar-cycle effects on solar oscillation frequencies


Measurements of solar oscillations taken in 1986 and 1988 show systematic changes in the Sun's acoustic-mode frequencies of the order of 1 part in 10,000. These data reveal that the frequency shifts are the result of latitude-dependent changes in the structure of the Sun which are correlated with the Sun's magnetic-activity cycle.

Additional Information

© 1990 Nature Publishing Group. Received 4 January: accepted 3 May 1990. We thank the observers at Big Bear Solar Observatory, particularly W. Marquette and R. Fear. We also thank P. Goldreich, N. Murray and P. Kumar for discussions. These data were analysed in part using the facilities of the San Diego Super-Computer Center, and the work was supported in part by the NSF.

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