The author makes a survey of reasons why we decided to modernize two medium-size telescopes with spectrographs at the Ondřejov observatory and he also presents several examples of flare and eruptive prominence observations.
The author makes a survey of reasons why we decided to modernize two medium-size telescopes with spectrographs at the Ondřejov observatory and he also presents several examples of flare and eruptive prominence observations. (en)