Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..133..111g&link_type=abstract
(IRIS /International Research on the Interior of the Sun/ Workshop, 2nd, Tashkent, Uzbek SSR, Sept. 1989, Proceedings. A91-37551
Physics
Solar Instruments, Solar Magnetic Field, Solar Observatories, Solar Oscillations, Solar Atmosphere, Solar Physics, Spatial Filtering
Scientific paper
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 makes 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.
Demidov Michael L.
Grigor'ev Victor M.
Kobanov Nikolai I.
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