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Helioseismic Observations at Stanford, 1977–1986

Published online by Cambridge University Press:  03 August 2017

Harald M. Henning  and
Philip H. Scherrer
Harald M. Henning
Affiliation:
Center for Space Science and Astrophysics, Stanford University, Stanford, CA 94305, USA
Philip H. Scherrer
Affiliation:
Center for Space Science and Astrophysics, Stanford University, Stanford, CA 94305, USA

Abstract

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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.

Type
Chapter 1: Observations of Solar Oscillations
Information
Symposium - International Astronomical Union , Volume 123: Advances In Hello- and Asteroseismology , 1988 , pp. 29 - 32
Copyright
Copyright © Reidel 1988 

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