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General presentation of a single IRIS site raw data analysis problem

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Abstract

A complete software package has been built for the calibration in m s −1 of the velocity residuals due to solar oscillations in the raw IRIS (International Research on the Interior of the Sun) data. It takes into account all known astronomical components contributing to the line-of-sight velocity between the instrument and the solar surface, and also the apparent velocity due to the non-uniform integration of the solar rotation as seen through an inhomogeneous Earth atmosphere. The IRIS data itself is used for the estimation of the nonlinear instrumental response to the velocity, and the residual can be directly obtained in velocity units, without low frequency filtering. On a day of typical photometric sky quality, the power spectrum obtained appears to be solar noise limited.

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Authors and Affiliations

  1. Astronomical Institute of the Uzbek Academy of Sciences, Tashkent, Uzbekistan SSR, U.S.S.R.

    S. Ehgamberdiev & S. Khalikov

  2. Département d'Astrophysique de l'Université de Nice, 06034, Nice Cédex, France

    E. Fossat

Authors
  1. S. Ehgamberdiev
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  2. S. Khalikov
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  3. E. Fossat
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Ehgamberdiev, S., Khalikov, S. & Fossat, E. General presentation of a single IRIS site raw data analysis problem. Sol Phys 133, 69–80 (1991). https://doi.org/10.1007/BF00149826

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  • DOI: https://doi.org/10.1007/BF00149826

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