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Proceedings Paper

Ultraviolet and visible-light coronagraphic imager (UVCI) for HERSCHEL (helium resonance scattering in corona and heliosphere
Author(s): Silvano Fineschi; Ester Antonucci; Marco Romoli; Daniele Gardiol; Giampiero Naletto; Silvio Giordano; Marco Malvezzi; Vania Da Deppo; Luca Zangrilli; Giancarlo Noci
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Paper Abstract

The HERSCHEL (HElium Resonance Scattering in the Corona and HELiosphere) Sun-Earth Sub-Orbital Program is a proposed sounding-rocket payload designed to investigate helium coronal abundance and solar wind acceleration from a range of solar source structures by obtaining simultaneous observations of the electron, proton and helium solar coronae. HERSCHEL will provide the first measurements of the coronal helium abundance in source regions of the solar wind, thus bringing key elements to our understanding of the Sun-Earth connections. The HERSCHEL instrument package consists of the Extreme Ultraviolet Imaging Telescope (EIT) for on-disk coronal observations and the Ultraviolet and Visible-light Coronagraphic Imager (UVCI) for off-limb observations of the corona. The UVCI is an externally occulted, reflecting coronagraph with an off-axis Gregorian telescope. UVCI will be able to take coronal images at heliocentric heights comprised between 1.2 to 3.5 solar radii of a) K-corona polarized brightness (pB); b) H I Lyman-α, 121.6 nm, line-emission; c) He II Lyman-α, 30.4 nm, line. The key element in the UVCI instrument concept is that the mirrors with multilayer coatings optimized for 30.4 nm still have good reflectivity at 121.6 nm and in the visible. The optical design concept for the UVCI instrument will be discussed, together with its expected optical and throughput performances.

Paper Details

Date Published: 11 February 2003
PDF: 10 pages
Proc. SPIE 4853, Innovative Telescopes and Instrumentation for Solar Astrophysics, (11 February 2003); doi: 10.1117/12.460431
Show Author Affiliations
Silvano Fineschi, INAF-Osservatorio Astronomico di Torino (Italy)
Ester Antonucci, INAF-Osservatorio Astronomico di Torino (Italy)
Marco Romoli, Univ. degli Studi di Firenze (Italy)
Daniele Gardiol, INAF-Osservatorio Astronomico di Torino (Italy)
Giampiero Naletto, Univ. degli Studi di Padova (Italy)
Silvio Giordano, INAF-Osservatorio Astronomico di Torino (Italy)
Marco Malvezzi, Univ. degli Studi di Pavia (Italy)
Vania Da Deppo, Univ. degli Studi di Padova (Italy)
Luca Zangrilli, INAF-Osservatorio Astronomico di Torino (Italy)
Giancarlo Noci, Univ. degli Studi di Firenze (Italy)

Published in SPIE Proceedings Vol. 4853:
Innovative Telescopes and Instrumentation for Solar Astrophysics
Stephen L. Keil; Sergey V. Avakyan, Editor(s)

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