Observation of global 160-min infrared /differential/ intensity variation of the sun

Details Observation of global 160-min infrared /differential/ intensity variation of the sun Observation of global 160-min infrared /differential/ intensity variation of the sun

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...82...21k&link_type=abstract

(International Astronomical Union and Akademiia Nauk SSSR, Colloquium on Problems of Solar and Stellar Oscillations, 66th, Nauch

Physics

Optics

5

Atmospheric Effects, Atmospheric Windows, Limb Darkening, Solar Limb, Solar Oscillations, Atmospheric Optics, Infrared Spectra, Opacity, Telescopes, Transparence

Scientific paper

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 λ1.65 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 well-known 160 min period with an average amplitude of about ± 2×10-4 in units of the 'average Sun' intensity near 1.65 μm.

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