Abstract
A device that makes it possible to quickly and accurately measure the instrumental profile (IP) of the high-resolution spectrograph using a source of monochromatic radiation is described. The switching between solar spectrum observations and IP measurements and vice versa is carried out by the rotation of only one additional coelostat mirror. IP measurements in the second, third, and fourth spectrum orders at a wavelength of 632.9 nm are conducted on the spectrograph of the ATsU-5 solar telescope using the LGN-302 gas He-Ne laser. The IP monitoring during the observational season showed the variation of IP half-widths within 10% and the IP dependence on the air temperature in the spectrograph. The importance of taking into account IP differences of incoherent sunlight and, partially, of coherent beam from the laser is emphasized. A method for the estimation of the laser beam coherence degree in the IP measurement is proposed.
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