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The Solar Diameter Imager and Surface Mapper (SODISM) on board the PICARDspace mission provides wide-field images of the photosphere and chromosphere ofthe Sun in five narrow pass bands (centered at 215.0, 393.37, 535.7, 607.1, and782.2 nm). PICARD is a space mission, which was successfully launched on 15June 2010 into a Sun synchronous dawn-dusk orbit. It represents a Europeanasset aiming at collecting solar observations that can serve to estimate someof the inputs to Earth climate models. The scientific payload consists of theSODISM imager and of two radiometers, SOVAP (SOlar VAriability PICARD) andPREMOS (PREcision MOnitor Sensor), which carry out measurements that allowestimating the Total Solar Irradiance (TSI) and the Solar Spectral Irradiance(SSI) from the middle ultraviolet to the red. The SODISM telescope monitorssolar activity continuously. It thus produces images that can also feed SSIreconstruction models. Further, the objectives of SODISM encompass the probingof the interior of the Sun via helioseismic analysis of observations inintensity (on the solar disc and at the limb), and via astrometricinvestigations at the limb. The latter addresses especially the spectraldependence of the radial limb shape, and the temporal evolution of the solardiameter and asphericity. After a brief review of its original scienceobjectives, this paper presents the detailed design of the SODISM instrument,its expected performance, and the scheme of its flight operations. Someobservations with SODISM are presented and discussed.

PICARD SODISM, a space telescope to study the Sun from the middle ultraviolet to the near infrared