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Proceedings Paper

Solar interferometry: space and ground instrumental prospects
Author(s): Luc Dame
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Paper Abstract

Recent advances in electronics and fast computer control allow to envisage extremely high spatial resolution observations of the Sun through the use of a compact array of phased telescopes. Several space missions (SUN/SIMURIS, SUN-SV, MUST/SIMURIS) have been proposed in that respect and will be briefly presented. Prospects for use of the space techniques for a solar array on ground are also indicated. Independently from the different mission concepts, solar interferometric imaging presents a unique case in the domain of optical aperture synthesis since the field- of-view is extended (larger than the diffraction spot of a telescope) and because the high resolution structures are evolving very rapidly and are naturally complex (low fringe visibility). These severe constraints drive solar arrays' design towards `compact' configurations (i.e. in which the spatial frequencies plane is filled) and real-time `cophasing' (direct-- hardware--zeroing of phase fluctuations by fine delay lines). They also influence the choice of the focal instrumentation which is optimum when using a subtractive double monochromator tunable over a large spectral range and providing narrow band filtergrams (up to 0.1 angstrom). We review the concepts and design issues of a solar interferometer and present numerical simulations and laboratory experiments of the system required to cophase an array of telescopes on a complex and extended field-of-view. Aperture configurations and image reconstruction are also discussed as well as the specific real-time metrology aspects of a ground array (atmospheric constraints derived from the performances evaluation of the ASSI Program).

Paper Details

Date Published: 9 June 1994
PDF: 16 pages
Proc. SPIE 2200, Amplitude and Intensity Spatial Interferometry II, (9 June 1994); doi: 10.1117/12.177279
Show Author Affiliations
Luc Dame, Service d'Aeronomie du CNRS (France)


Published in SPIE Proceedings Vol. 2200:
Amplitude and Intensity Spatial Interferometry II
James B. Breckinridge, Editor(s)

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