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An apodized aperture for solar coronagraphy

Published online by Cambridge University Press:  24 December 2009

L. Spinoglio ,
N. Epchtein  and
C. Aime
C. Aime*
Affiliation:
Université de Nice Sophia-Antipolis, Centre National de la Recherche Scientifique, UMR 6525 H. Fizeau, Observatoire de la Côte d'Azur, Campus Valrose, 06108 Nice Cedex 2, France
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Abstract

An apodized aperture should make it possible the direct observation of the solar corona without the need of a Lyot coronagraph. For a perfect circular aperture, a Sonine transmission of the form of a simple parabola (maximum at the aperture center and zero at the edge) should sufficiently reduce the diffraction halo produced by the solar disc to observe the corona very close to the solar limb (a few seconds of arc). The MTF of the apodized aperture takes the form of a Gaussian curve. The high dynamic capability of the instrument is obtained with the drawback of a reduction in throughput and a loss in classical resolution of about 20%, compared with a clear aperture.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 40: 3rd ARENA Conference: An Astronomical Observatory at CONCORDIA (Dome C, Antarctica) , 2010 , pp. 473 - 476
Copyright
© EAS, EDP Sciences, 2010

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References

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