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Preliminary Results from Observations with the Fourier Tachometer

Published online by Cambridge University Press:  12 April 2016

J. Schou ,
T.M. Brown  and
K.T. Bachmann
J. Schou
Affiliation:
Institut for Fysik og Astronomi, Århus Universitet, Denmark, and High Altitude Observatory, National Center for Atmospheric Research*, Boulder, Colorado, USA
T.M. Brown
Affiliation:
High Altitude Observatory
K.T. Bachmann
Affiliation:
High Altitude Observatory

Extract

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Recently several interesting results concerning the time dependence of solar p-mode frequencies have appeared. In particular it has been shown that the mode frequencies change with solar activity (Libbrecht and Woodard 1991).

We present preliminary results from an analysis of two ≈ 3 month observation runs with the Fourier Tachometer (which was operated by HAO and NSO) from 1987 and 1989. The analysis was done with two different methods in order to test for systematic errors. We show that the mode frequencies change in a manner similar to that reported by Libbrecht and Woodard. We also present results for the frequency splittings caused by the solar rotation.

Type
I. Setting the stage: Sun, Stars Galaxies and the Universe
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 90 - 92
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Libbrecht, K.G. and Woodard, M.F., 1991, Science, 253, 152.Google Scholar