CTIS

A CTIS, for computed tomography imaging spectrometer (or imaging spectrograph) is an imaging spectrometer which records the spectrum without use of a slit, with the spectral and spatial data blurred together, and multiple orders that are overlapping. A data cube including a spectral energy distribution for each pixel is produced by post processing using computed tomography methods. This type of spectrometer is of interest for observing the solar corona, where photons are plentiful and the challenge is capturing the data quickly and repeatedly in order to follow the constant changes of solar events.