The Large Angle and Spectrometric Coronagraph on board the Solar and Heliospheric Observatory satellite consists of three solar coronagraphs with nested fields of view: C1 - a Fabry–Pérot interferometer coronagraph imaging from 1.1 to 3 solar radii C2 - a white light coronagraph imaging from 1.5 to 6 solar radii C3 - a white light coronagraph imaging from 3.7 to 30 solar radii The first principal investigator was Dr. Guenter Brueckner. Wikipedia