Computer Science
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sajsc..77...81j&link_type=abstract
South African Journal of Science, vol. 77, Feb. 1981, p. 81-83. Research supported by the University of the Orange Free State an
Computer Science
Fabry-Perot Interferometers, H Alpha Line, Solar Limb, Solar Prominences, Diffraction Patterns, Voigt Effect
Scientific paper
The Fabry-Perot interferometer is an effective dispersing element for studying H-alpha emission from solar limb prominences. Having a reflecting coefficient in the range 0.85-0.95, the Fabry-Perot multiple beam interferometer behaves as an angular filter, forming circular interference fringes. Results from an investigation performed at the solar installation at Boyden Observatory in South Africa are presented, where a photographic Fabry-Perot interferometer was used to obtain fringes from the 656.3-nm H-alpha emission during April and May 1980. Successful scans were made with air admitted to the interferometer pressure chamber, and reduction of the data on photon count and chamber pressure was made by a UNIVAC 1108 computer. Sketches and profiles from the limb prominences are shown; a table of fringe half-widths, corrected for the instrumental width of the interferometer, were obtained by matching a Voigt function by a least-squares computer fit to the observed scanned Fabry-Perot fringe profiles.
Jarrett Alan H.
Lategan Andries H.
Stapelberg J.
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