CAOSP abstracts, Volume: 41, No.: 2, year: 2011

Abstract: Solar observations would benefit from simultaneous imaging and spectroscopy. To approach in an optimal manner such an ideal goal we have designed and built in THEMIS a spectro-imager based upon the concept of subtractive double pass through a diffraction grating spectrograph called TUNIS. In its basic design it produces an image at a wavelength which changes linearly in one of the directions of the image. To improve the simultaneity of the spectral coverage, we have implemented a spectral multiplexing, based upon Hadamard spectroscopy. We present the first observations of TUNIS and give the main specifications. TUNIS has been proposed for the European Solar Telescope (EST) project.