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Proceedings Paper

Apodized apertures for solar coronagraphy
Author(s): Alexis Carlotti; Claude Aime; Jean Arnaud; Marianne Faurobert; André Ferrari; Catherine Grec; Gilbert Ricort
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Paper Abstract

An apodized aperture should make it possible to observe the solar corona without the need of a Lyot coronagraph. We show in this communication that Sonine functions are much better apodizers for the observation of the solar corona than the generalized prolate spheroidal functions previously proposed. For a perfect circular aperture of diameter unity operated in space, a simple Sonine apodization of the form (1 - 4r2), with |r| ≤ 1/2 should sufficiently reduce the diffraction halo produced by the solar disc to observe the corona very close to the solar limb (a few arcsec). The throughput is just one third of the clear aperture.

Paper Details

Date Published: 9 July 2008
PDF: 8 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 701415 (9 July 2008); doi: 10.1117/12.789260
Show Author Affiliations
Alexis Carlotti, Univ. de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur (France)
Claude Aime, Univ. de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur (France)
Jean Arnaud, Univ. de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur (France)
Marianne Faurobert, Univ. de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur (France)
André Ferrari, Univ. de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur (France)
Catherine Grec, Univ. de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur (France)
Gilbert Ricort, Univ. de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur (France)


Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)

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