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The Hinode/XRT Full-Sun Image Corrections and the Improved Synoptic Composite Image Archive

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Abstract

The XRT Synoptic Composite Image Archive (SCIA) is a storage and gallery of X-ray full-Sun images obtained through the synoptic program of the X-Ray Telescope (XRT) onboard the Hinode satellite. The archived images provide a quick history of solar activity through the daily and monthly layout pages and long-term data for morphological and quantitative studies of the X-ray corona. This article serves as an introduction to the SCIA, i.e., to the structure of the archive and specification of the data products included therein. We also describe a number of techniques used to improve the quality of the archived images: preparation of composite images to increase intensity dynamic range, removal of dark spots that are due to contaminants on the CCD, and correction of the visible stray light contamination that has been detected on the Ti-poly and C-poly filter images since May 2012.

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Acknowledgements

Hinode is a Japanese mission developed and launched by ISAS/JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners. It is operated by these agencies in co-operation with ESA and the NSC (Norway). This work was supported by NASA grant NNM07AB07C for Hinode XRT science. We thank David McKenzie for providing the dust size measurements. We also thank Patrick MacCauley, Adam Kobelski, and Nicole Schanche for their help in characterizing the effects of the light leak, and we thank Antonia Savcheva and Patricia Jibben for the help in developing and testing the spot-correction code. AT thanks Loren Acton for helpful comments and wording advice.

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Authors and Affiliations

  1. Montana State University, P.O. Box 173840, Bozeman, MT, 59717, USA

    Aki Takeda & Keiji Yoshimura

  2. Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA, 02138, USA

    Steven H. Saar

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  1. Aki Takeda
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  2. Keiji Yoshimura
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  3. Steven H. Saar
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Correspondence to Aki Takeda.

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Takeda, A., Yoshimura, K. & Saar, S.H. The Hinode/XRT Full-Sun Image Corrections and the Improved Synoptic Composite Image Archive. Sol Phys 291, 317–333 (2016). https://doi.org/10.1007/s11207-015-0823-8

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  • DOI: https://doi.org/10.1007/s11207-015-0823-8

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