The reduction of scattered light in an external occulting disk coronagraph

Details The reduction of scattered light in an external occulting disk coronagraph The reduction of scattered light in an external occulting disk coronagraph

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....63..243f&link_type=abstract

Astronomy and Astrophysics, vol. 63, no. 1-2, Feb. 1978, p. 243-246.

Astronomy and Astrophysics

Astronomy

4

Coronagraphs, Light Scattering, Solar Eclipses, Spaceborne Astronomy, Diffraction, Disks (Shapes), Electropolishing, Radiant Flux Density

Scientific paper

The light intensity scattered by the external occulting disk is the main limitation in the observation of the outer corona with a space coronagraph. In order to estimate this effect, a calculation of the diffracted flux at the entrance coronagraphic lens is briefly presented for a circular occulting disk. In order to reduce this scattered light so that the instrument background level is comparable to that of the sky light encountered during total eclipse, it is demonstrated experimentally that apodization by a toothed wheel, as suggested by Purcell and Koomen (1962), is effective. To achieve the required degree of optical polish, electrolytic polishing has been used.

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