Physics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.344..171d&link_type=abstract
In ESA, Solar Physics and Astrophysics at Interferometric Resolution p 171-180 (SEE N93-10901 01-90)
Physics
High Resolution, Interferometers, Optical Equipment, Solar Instruments, Solar Physics, Systems Engineering, Temperature Control, Ultraviolet Telescopes, Fine Structure, Photosphere, Solar Corona, Spaceborne Telescopes, Spatial Resolution, Spectral Resolution, Synthetic Apertures
Scientific paper
Reasons for the design choices of SUN, a space interferometer to observe the solar fine structure from the photosphere to the corona, are given. The current status of the instrument definition and performances are presented. SUN is a compact optical interferometer formed with four telescopes of 20 cm diameter distributed non-redundantly on a linear baseline of 2 m. In addition to its intrinsic high spatial resolution (10 km on the Sun at wavelength 120 nm), SUN has an elaborate focal plane instrument, a subtractive double monochromator, that provides 6 simultaneous images of high spectral resolution and is tunable from the far UV (1175 A) to the near IR (1.1 micrometers). Central to SUN imaging capabilities is a powerful, real time, metrology control of the phase error and beam pointing. The compact array configuration, the co-phased recording of fringes, and the spectral properties of the double monochromator of SUN allow interferometric imaging of the complex and extended solar structure with exceptional detail.
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