The 160 Minutes Oscillations

Kotov, V. A.

doi:10.1007/978-94-009-4588-3_5

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Minute Phase Stability1

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1988

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“…Phase stability for a signal in the range 159.976 to 160.024 minutes would result in sloping lines across the plot with phase shifts less than 80 minutes per year. The lines correspond to the previously reported 160.010 minute signal determined for both Stanford (1976Stanford ( -1980 and Crimean observations (1974)(1975)(1976)(1977)(1978)(1979)(1980)(1981)(1982)(1983)(1984) (Kotov, 1985). The agreement in later years is not as strong as for the years through 1979.…”

Section: Minute Phase Stabilitysupporting

confidence: 84%

Helioseismic Observations at Stanford, 1977–1986

Henning

Scherrer

1988

Symp. - Int. Astron. Union

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Observations of low degree modes of solar oscillation have been made at The Wilcox Solar Observatory at Stanford University for more than a decade. We are presently re-examining the set of observations from 1977 through 1986. We have first tested the stability of the p-mode frequencies for modes of degree l=2–5 in each year. We find a marginally significant trend of a decrease in p-mode frequencies of 0.06 μHz per year. We have also examined the continuity of the observed signal at 160.01 minutes. We find that the previously reported phase stability is no longer present. However, due to uncertainties in calibration we can not exclude the reality of the reported signal.

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Section: Minute Phase Stabilitysupporting

confidence: 84%