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Proceedings Paper

The Lyman-alpha telescope of the extreme ultraviolet imager on Solar Orbiter
Author(s): Udo Schühle; Jean-Philippe Halain; Stefan Meining; Luca Teriaca
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Paper Abstract

On the Solar Orbiter mission, the Extreme Ultraviolet Imager (EUI) set of filtergraph-telescopes consists of two highresolution imagers (HRI) and one dual-band full Sun imager (FSI) that will provide images of the solar atmosphere in the extreme ultraviolet and in the Lyman-α line of hydrogen at 121.6 nm. The Lyman-α HRI, in particular, will provide imaging of the upper chromospheres/lower transition region of the Sun at unprecedented high cadence and at an angular resolution of 1"; (corresponding to a spatial resolution of 200 km at perihelion). For vacuum-ultraviolet imaging of the Sun the main requirements for the instrumentation are high resolution, high cadence, and large dynamic range. We present here the novel solutions of the instrument design and show in detail the predicted performance of this telescope. We describe in detail how the high throughput and spectral purity at 121.6 nm is achieved. The technical solutions include multilayer coatings of the telescope mirrors for high reflectance at 121.6 nm, combined with interference filters and a multichannel-plate intensified CMOS active pixel camera. We make use of the design flexibilities of this camera to optimize the dynamic range in the focal plane.

Paper Details

Date Published: 7 October 2011
PDF: 11 pages
Proc. SPIE 8148, Solar Physics and Space Weather Instrumentation IV, 81480K (7 October 2011); doi: 10.1117/12.893573
Show Author Affiliations
Udo Schühle, Max-Planck-Institut für Sonnensystemforschung (Germany)
Jean-Philippe Halain, Univ. de Liège (Belgium)
Stefan Meining, Max-Planck-Institut für Sonnensystemforschung (Germany)
Luca Teriaca, Max-Planck-Institut für Sonnensystemforschung (Germany)

Published in SPIE Proceedings Vol. 8148:
Solar Physics and Space Weather Instrumentation IV
Silvano Fineschi; Judy Fennelly, Editor(s)

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