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Proceedings Paper • Open Access

Stray light rejection in giant externally-occulted solar coronagraphs: experimental developments
Author(s): M. Venet; C. Bazin; S. Koutchmy; P. Lamy

Paper Abstract

The advent of giant, formation-flight, externally-occulted solar coronagraphs such as ASPIICS (Association de Satellites Pour l’Imagerie et l’Interférométrie de la Couronne Solaire [1,2,3,4]) selected by the European Space Agency (ESA) for its third PROBA (Project for On-Board Autonomy) mission of formation flying demonstration (presently in phase B) and Hi-RISE proposed in the framework of ESA Cosmic Vision program, presents formidable challenges for the study and calibration of instrumental stray light. With distances between the external occulter (EO) and the optical pupil (OP) exceeding hundred meters and occulter sizes larger than a meter, it becomes impossible to perform tests at the real scale. The requirement to limit the over-occultation to less than 1.05 Rsun, orders of magnitude to what has been achieved so far in past coronagraphs, further adds to the challenge. We are approaching the problem experimentally using reduced scale simulators and present below a progress report of our work.

Paper Details

Date Published: 5 January 2018
PDF: 7 pages
Proc. SPIE 10565, International Conference on Space Optics — ICSO 2010, 105651W (5 January 2018); doi: 10.1117/12.2309186
Show Author Affiliations
M. Venet, Lab. d’Astrophysique de Marseille (France)
C. Bazin, Institut d’Astrophysique de Paris (France)
S. Koutchmy, Institut d'Astrophysique de Paris (France)
P. Lamy, Lab. d'Astrophysique de Marseille (France)

Published in SPIE Proceedings Vol. 10565:
International Conference on Space Optics — ICSO 2010
Errico Armandillo; Bruno Cugny; Nikos Karafolas, Editor(s)

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