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Proceedings Paper

In-orbit verification, calibration, and performance of the Heliospheric Imager on the STEREO mission
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Paper Abstract

The Heliospheric Imager (HI) forms part of the SECCHI suite of instruments aboard the two NASA STEREO spacecraft which were launched successfully from Cape Canaveral AFB on 25 Oct 2006 (26 Oct UTC). Following lunar swingby's on 15 Dec and 21 Jan respectively, the two spacecraft were placed in heliocentric orbits at approximately 1 AU - one leading and one lagging the Earth, with each spacecraft separating from the Earth by 22.5° per year. Each HI instrument comprises two wide-angle optical cameras - HI-1 and HI-2 have 20° and 70° fields-of-view which are off-pointed from the Sun direction by 14.0° and 53.7° respectively, with the optical axes pointed towards the ecliptic plane. In this way the cameras will for the first time provide stereographic images of the solar corona, and in particular of Coronal Mass Ejections (CMEs) as they propagate outwards through interplanetary space towards the Earth and beyond. The wide-field coverage of HI enables imaging of solar ejecta from 15 to about 330 solar radii whilst the other SECCHI instruments (2 coronagraphs and an EUV imager) provide coverage from the lower corona out to 15 solar radii. This paper briefly reviews the design and performance requirements for the instrument. The various activation, checkout and calibration activities before and after opening the instrument's protective cover or door (instrument 'first-light') are then described and it is shown that the instrument has met the design requirements, including CCD and camera imaging performance, correction for shutterless operation of the cameras, straylight rejection and thermal requirements. It is demonstrated from observations of a CME event on 24-25 Jan 2007 that the instrument is capable of detecting CMEs at an intensity of 1% of the coronal background. Lessons learnt during the design, development and in-orbit operation of the instrument are discussed.

Paper Details

Date Published: 20 September 2007
PDF: 13 pages
Proc. SPIE 6689, Solar Physics and Space Weather Instrumentation II, 668907 (20 September 2007); doi: 10.1117/12.732822
Show Author Affiliations
Chris Eyles, Rutherford Appleton Lab. (United Kingdom)
Univ. de Valencia (Spain)
Univ. of Birmingham (United Kingdom)
Chris Davis, Rutherford Appleton Lab. (United Kingdom)
Richard Harrison, Rutherford Appleton Lab. (United Kingdom)
Nick Waltham, Rutherford Appleton Lab. (United Kingdom)
Jean-Philippe Halain, Univ. de Liège (Belgium)
Emmanuel Mazy, Univ. de Liège (Belgium)
Jean-Marc Defise, Univ. de Liège (Belgium)
Russ Howard, Naval Research Lab. (United States)
Dan Moses, Naval Research Lab. (United States)
Jeff Newmark, Naval Research Lab. (United States)
Simon Plunkett, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 6689:
Solar Physics and Space Weather Instrumentation II
Silvano Fineschi; Rodney A. Viereck, Editor(s)

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