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Observation of Global 160-min Infrared (Differential) Intensity Variation of the Sun*

Published online by Cambridge University Press:  12 April 2016

V.A. Kotov ,
S. Koutchmy  and
O. Koutchmy
V.A. Kotov
Affiliation:
Crimean Astrophysical Observatory, Nauchny, Crimea 334413, U.S.S.R.
S. Koutchmy
Affiliation:
S.A.S. Institut d'Astrophysique, CNRS, 98 bis BD Arago, F 75014 Paris, France
O. Koutchmy
Affiliation:
Laboratoire d'Analyse Numerique, Université P&M Curie, F 75014 Paris, France

Abstract

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The method developed and the instrument designed for detecting variations of the solar limb darkening at the atmospheric transparency window of the solar opacity minimum region of λ 1.65 µ are described. This differential technique proved to be successful in rejecting undesirable low frequency noises due to the atmosphere and to the instrument. Analysis of observations made in 1977, 1978, and 1981 indicates the persistance of global fluctuations of the IR differential, center-to-limb intensity at the wellknown 160 min period with an average amplitude of about ± 2 x 10-4 in units of the ‘average Sun’ intensity near 1.65 µm.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 66: Problems of Solar and Stellar Oscillations , 1983 , pp. 21 - 35
Copyright
Copyright © Reidel 1983

Footnotes

*

Proceedings of the 66th IAU Colloquium: Problems in Solar and Stellar Oscillations, held at the Crimean Astrophysical Observatory, U.S.S.R., 1–5 September, 1981.

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