Why do telescopes such as TRACE and SOHO use special mirrors to reflect Extreme ultraviolet ?
Unlike many space - based and ground telescopes , there is no time formally allocated by the SOHO program for observing proposals on individual instruments : interested parties can contact the instrument teams directly via e-mail and the SOHO web site to request time via that instrument team 's internal processes ( some of which are quite informal , provided that the ongoing reference observations are not disturbed ) .