SOLAR ULTRAVIOLET NETWORK (SUN) : An Interferometric Investigation Of The Fundamental Solar Astrophysical Scales

Damé, Luc; Moreau, B.; Visser, Huib; Title, A. M.; Acton, L. W.; Aime, Claude; Braam, B. C.; Bruner, M. E.; Connes, P.; Faucherre, M.; Foing, B. H.; Haisch, B. M.; Hoekstra, R.; Heyvaerts, J.; Jalin, R.; Lemaire, Philippe; Martić, M.; Müller, R.; Noëns, J. C.; Porteneuve, Jacques; Schulz-Lüpertz, E.; Lühe, O. von der

doi:10.1117/12.961515

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“…1, are in the co-phasing system (which has been fully designed with polarization splitting in the reference interferometers and access to slight repointing for contrast optimization), and the Double Grating Spectrometer which has been added an anarnorphosing input mirror in order to reduce the beam extent (this modification allows lighter gratings and therefore larger amplitude rotating mechanisms for them, i.e. The major changes brought to SUN during the preparation of the SIMURIS proposal, as compared to the description of ref.…”

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<title>Optical recombination tolerances of the Solar Ultraviolet Network</title>

1990

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We briefly recall the characteristics and particularities of the optical recombination of the Solar Ultraviolet Network (SUN) experiment which consists in a non-redundant << compact >> array of 4 telescopes of 20 cm diameter aligned on a 2 meters linear baseline. We proceed to the evaluation of the geometrical and optical aberrations of the recombination outlining the difficulties inherent to interferometric systems (in particular, and forgotten up to now, the << cophasing condition >>).We conclude on the advantages linked to a compact system like SUN. is BRIEF DESCRIPTION OF THE SUN CONCEPTThe SUN experiment is intended for ultrahigh resolution imaging and spectroscopy of the Solar Atmosphere from the ultraviolet wavelength range (the C III line at 1 175 A) to the near infrared wavelengths. It consists in a 2 m long linear array of 4 telescopes. The telescopes, 20 cm in diameter, are non-redundantly spaced with interdistances ld-3d-2d, and d = 30 cm (Fig. 1). The essential of the experiment as been described in a previous paper1. Specific to the SUN concept are : a diasporameter for the remote pointing stabilization on the solar limb (even during rotation of the array), the use of stabilization on a remote solar field in the visible (using white light fringe tracking from Differential Synchronous Reference Interferometers), and a detection system consisting in a Double Grating Spectrometer allowing adjustable narrow band filtergrams of the fringe pattern directly addressable by Radio Astronomy reconstruction methods for imaging on extended field of views.

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confidence: 99%