Apodized apertures for solar coronagraphy

Alexis Carlotti; Claude Aime; Jean Arnaud; Marianne Faurobert; André Ferrari; Catherine Grec; Gilbert Ricort

doi:10.1117/12.789260

9 July 2008 Apodized apertures for solar coronagraphy

Alexis Carlotti, Claude Aime, Jean Arnaud, Marianne Faurobert, André Ferrari, Catherine Grec, Gilbert Ricort

Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 701415 (2008) https://doi.org/10.1117/12.789260
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

Citation Download Citation

Alexis Carlotti, Claude Aime, Jean Arnaud, Marianne Faurobert, André Ferrari, Catherine Grec, and Gilbert Ricort "Apodized apertures for solar coronagraphy", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 701415 (9 July 2008); https://doi.org/10.1117/12.789260

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