Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..445..312b&link_type=abstract
IN: Instrumentation in astronomy V; Proceedings of the Fifth Meeting, London, England, September 7-9, 1983 (A85-25360 10-89). Be
Astronomy and Astrophysics
Astronomy
Coronagraphs, Lyman Alpha Radiation, Ultraviolet Telescopes, Birefringent Filters, Diffraction, Light Scattering, Occultation, Paraboloid Mirrors, Solar Flares
Scientific paper
An all reflecting externally and internally occulting solar coronagraph which can be used for observations of the sun in the hydrogen Lyman-alpha line is described. In the particular design considered and tested, a multiple occulting disk assembly is integrated with a Gregorian telescope in such a way that (1) scattered and diffracted light is minimized, and (2) a large effective collecting area (16 sq cm) as compared to the total telescope length (95 cm) is obtained. The telescope is sun-centered pointed and has a large field of view (2.3 degrees diameter). Its image can be used to feed a multiple slit spectrograph, a camera using a Lyman-alpha interference filter or other instrumentation which can make use of the availability of a full coronal image.
Argo H. V.
Beckers Jacques M.
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