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Title:
The Effect of the 1999 Total Solar Eclipse on a Foucault-pendulum
Authors:
Wuchterl, G.; Wirrer, A.
Affiliation:
AA(Max-Planck Institut für extraterrestrische Physik, Postfach 1312, D-85741 Garching, Germany), AB(Rosittengasse 32a, A-5020 Salzburg)
Journal:
Astronomische Gesellschaft Abstract Series, Vol. 17. Abstracts of Contributed Talks and Posters presented at the Annual Scientific Meeting of the Astronomische Gesellschaft at Bremen, September 18-23, 2000.
Publication Date:
00/2000
Origin:
AUTHOR
Bibliographic Code:
2000AGM....17.CT01W

Abstract

We present the result of a series of observations of the Foucault-pendulum at the Technisches Museum Wien before, during and after the total solar eclipse on August 11, 1999. The progression of the azimuth of the plane of oszillation of the penduum was observed on three days centered around the eclipse as well as 1 day centered around the following new moon. Systematic deviations from the nominal value for the Foucault-effect have been observed resulting in azimuth deviations of a few degrees. Similar values have been reported in earlier experiments. We propose a mechanism, based on pressure-modulated air drag, to account for the observed deviations. An eclipse-effect on a Foucault pendulum can then be explained as air drag modulation caused by the atmospheric pressure modulations due to the moon's shadow.
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