Use of the World Coordinate System by STEREO/SECCHI, and Lessons Learned for Solar Orbiter and Other Future Missions

Details Use of the World Coordinate System by STEREO/SECCHI, and Lessons Learned for Solar Orbiter and Other Future Missions Use of the World Coordinate System by STEREO/SECCHI, and Lessons Learned for Solar Orbiter and Other Future Missions

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1515t&link_type=abstract

American Astronomical Society, SPD meeting #40, #15.15; Bulletin of the American Astronomical Society, Vol. 41, p.837

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Scientific paper

The World Coordinate System (WCS) is a FITS standard for embedding coordinate information in a FITS header. Its first extensive use within solar physics is by the Sun Earth Connections Coronal and Heliospheric Investigation (SECCHI) telescope suite aboard the Solar Terrestrial Relations Observatory (STEREO). The WCS formalism assists in SECCHI data analysis in several ways. First of all, the spherical effects associated with the extremely wide fields of view of the Heliospheric Imager (HI) telescopes can be handled in a completely unambiguous and standard fashion. Of particular importance is that WCS positional keywords allow spacecraft ephemeris information to be embedded within the FITS header without depending on mission-specific keywords. Ephemeris data is critical to the three-dimensional analysis that the STEREO mission is designed for. We will also show how the WCS software in SolarSoft can be used to relate STEREO data to other missions such as the Solar and Heliospheric Observatory (SOHO). The ability of WCS to support a parallel celestial R.A./Dec coordinate system, and the use of WCS for COR1 synoptic maps, are also discussed. The advantages that STEREO has derived from WCS can equally be applied to other solar missions, in particular Solar Orbiter, and should be adopted by all future missions.

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