Apodized apertures for solar coronagraphy

Details Apodized apertures for solar coronagraphy Apodized apertures for solar coronagraphy

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..566a&link_type=abstract

SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July

Astronomy and Astrophysics

Astrophysics

Scientific paper

The solar corona cannot be studied without the help of a coronagraph. A telescope with an apodized aperture is, as described by Aime (2007), an alternative to the classical Lyot coronagraph. A spheroidal prolate apodization will modify the PSF of the telescope and optimize the energy concentration in the focal plane. A strong apodization (prolatness parameter c ≈ 10) would reduce the diffraction halo by a factor 10^5 at a cost of intensity throughput reduced at 10 %. In a site with outstanding daytime seeing, like Dome C, this method should allow to observe the corona extremely close to the solar limb and also, much better than otherwise, the rich chromospheric weak emission spectrum.

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