Schematic representation of the hybrid externally occulted Lyot solar coronagraph, adapted from Rougeot (2017) – Figure not to scale. The six key planes O, A, B, O′, C, and D, and key geometrical parameters are reported. The dotted lines illustrate geometrical optical paths. The variables are as follows: R radius of the external occulter; z0, z1 and z2 the distances from plane O to A, plane A to O′ and plane O′ to C, respectively; Rp radius of the entrance pupil; f1, f2, and f3 the focal lengths of the objectives L1, L2, and L3, respectively; Rio radius of the internal occulter; Rls radius of the Lyot stop. See text for the detailed description.
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