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Proceedings Paper

Ultraviolet and visible-light coronagraph for the Solar Orbiter mission
Author(s): Ester Antonucci; Silvano Fineschi; Daniele Gardiol; Giancarlo C. Noci; Marco Romoli; Giampiero Naletto; Giuseppe Tondello; Marco Zattarin; Andrea Marco Malvezzi; Stefano Cesare
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Paper Abstract

The Ultraviolet and Visible-light Coronagraph (UVC) is one of the solar remote-sensing instruments proposed for the model payload of the Solar Orbiter mission. The Solar Orbiter is one of the two 'Flexible' missions selected in September 2000 by the European Space Agency (ESA) for the definition study phase. A novel orbital design takes the orbiter as close as 0.21 astronomical units (AU) to the Sun, with heliographic latitudes as high as 38 degrees for observations of the solar polar regions at very high spatial resolution. From this vantage point, the UVC can, at the same time, image the visible and ultraviolet coronal emissions and diagnose, with unprecedented temporal and spatial resolution (down to 1200 km) the full solar corona. The UVC's optical design, presented here, consists of an externally occulted, off-axis Gregorian with multilayer-coated optics. The UVC can obtain monochromatic images in the neutral hydrogen HI Lyman (alpha) , (lambda) 121.6 nm, and single-ionized helium HEII Lyman (alpha) , (lambda) 30.4 nm, lines and measure the polarized brightness (pB) of the visible K-corona. The ultraviolet Lyman (alpha) lines are separated with two multilayer coatings mirror and an extreme-ultraviolet transmission filter. The mirrors' coating optimized for 30.4 nm still has a good reflectivity at 121.6 nm and visible. The optical performances, resulting from ray-tracing calculations, are presented here, along with the expected system response to the coronal signal.

Paper Details

Date Published: 18 December 2000
PDF: 12 pages
Proc. SPIE 4139, Instrumentation for UV/EUV Astronomy and Solar Missions, (18 December 2000); doi: 10.1117/12.410536
Show Author Affiliations
Ester Antonucci, Osservatorio Astronomico di Torino (Italy)
Silvano Fineschi, Osservatorio Astronomico di Torino (Italy)
Daniele Gardiol, Osservatorio Astronomico di Torino (Italy)
Giancarlo C. Noci, Univ. degli Studi di Firenze (Italy)
Marco Romoli, Univ. degli Studi di Firenze (Italy)
Giampiero Naletto, Univ. degli Studi di Padova (Italy)
Giuseppe Tondello, Univ. degli Studi di Padova (Italy)
Marco Zattarin, Univ. degli Studi di Padova (Italy)
Andrea Marco Malvezzi, Univ. degli Studi di Pavia (Italy)
Stefano Cesare, Alenia Aerospazio (Italy)

Published in SPIE Proceedings Vol. 4139:
Instrumentation for UV/EUV Astronomy and Solar Missions
Silvano Fineschi; Clarence M. Korendyke; Oswald H. W. Siegmund; Bruce E. Woodgate, Editor(s)

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