Computer Science – Performance
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lastr..99..557d&link_type=abstract
L'Astronomie (ISSN 0004-6302), vol. 99, Dec. 1985, p. 557-566. Research supported by the Institut National d'Astronomie et de Ge
Computer Science
Performance
2
Spectroheliographs, Astronomical Photography, Bandpass Filters, H Alpha Line, Optical Filters, Polarizers
Scientific paper
Design and performance features of a new heliograph built to replace the 20 year old apparatus at the Meudon Observatory are delineated. The new instrument was required to be capable of full disk observations, have a finer passband adjustment than 1.5 A, and have a significant separation power. The new heliograph was fitted with a series of polarizing calcite lenses, each successively twice as thick as the preceding one, with the thickest magnifying the weakest lines. Each layer can eliminate at least one spectral channel. The passband sensitivity of the new filter is 0.5 A. Additionally, the layers can be used in combination to fine tune the focus on a single wavelength such as that from H-alpha. Schematics are furnished of the instrument, along with a sample sequence of solar images at H-alpha.
Demarcq J.
Fruteau de Laclos M.
Nicolas Maxime
Olivieri G.
Roussel R.
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