The STEREO observatory is a NASA mission dedicated to the observation of the Sun from two point of views. One of its instrument, the Heliospheric Imager, is a novel instrument specialised to the observation of Coronal Mass Ejections (CME). It provides images of the heliosphere from 4 to 90 arcdeg in the visible wavelength range, allowing to track CME from the Sun outer corona up to the Earth orbit. STEREO was launched in October 2006 is still operational (http://stereo.gsfc.nasa.gov/).
The Centre Spatial de Liège was involved in the design and on-ground calibration of the STEREO Heliospheric Imager, and in particular in its straylight design. The instrument achieved a very high rejection of the Sun brightness (~10^-14) allowing to reach a sufficient signal on noise ratio to detect the faint CME propagation over long distance from the Sun (http://www.stereo.rl.ac.uk/).
Contact(s) : Jean-Philippe Halain email@example.com