Abstract
During the past decade a number of instruments designed for studying solar oscillations have been developed at the Sayan observatory. A double solar telescope using two Jensch-coelostats and two objective lenses provides the capability to filter lower-order modes. This instrument is also used (in the single-telescope mode) for making observations of the mean magnetic field of the Sun. Spatially-differential methods based on polarization separation of images are best suited for investigations of local oscillations and higher-order modes. These methods make it possible to carry out narrow-band spatial filtering of large wave numbers. They are useful when investigating contrast oscillations as well as the oscillations and rotation of sunspots and other solar features.
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Grigoryev, V.M., Demidov, M.L. & Kobanov, N.I. Instrumental capabilities of the Sayan observatory for the study of oscillatory processes on the Sun. Sol Phys 133, 111–116 (1991). https://doi.org/10.1007/BF00149831
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DOI: https://doi.org/10.1007/BF00149831