Solar Optical Spectroscopy in the Ondrejov Observatory

Physics – Optics

Scientific paper

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Scientific paper

Solar astrophysics based on spectroscopic observations and methods was implemented in the Astronomical Institute of the Academy of Sciences in Ondřejov in the middle of 1950's. First, the solar patrol service started to use spectrohelioscope for detection of flares and for measurement of the Hα line width during flares. Then, the Multichannel Flare Spectrograph with an unique construction was put into operation in 1958 and was used for detection of photographic spectra in several diagnostically important lines simultaneously for more than 2 solar cycles. A prototype of large horizontal spectrograph (Czerny-Turner type) was built in 1960's and was mainly used for measurements of solar magnetic and velocity fields. Since 1980's two new horizontal solar telescopes with spectrographs developed and delivered by Carl Zeiss Company are used in the Ondřejov Observatory. Physical properties and parameters of solar flare and prominence plasma based on spectral observations and computer modelling began to be studied intensively. Recently, the two spectrographs were modernized as concerns their optics, controlling electronics and detectors. Spectra of solar active phenomena obtained with a high spectral and temporal resolution are used together with data from space experiments to understand better some specific tasks of solar physics. The contribution briefly describes both historical and contemporary instrumental spectroscopic facilities as well as some important results obtained using the solar optical spectral observations at Ondřejov.

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