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Precise Determination of the Coordinate Systems for the Yohkoh Telescopes and the Application of a Transit of Mercury |
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| Authors: | Wülser J-P Hudson H S Nishio M Kosugi T Masuda S Morrison M |
| Institution: | (1) Institute for Astronomy, University of Hawaii, Honolulu, HI, 96822, U.S.A;(2) Nobeyama Radio Observatory, Minamisaku, Nagano, 384-13, Japan;(3) Solar-Terrestrial Environment Laboratory, Nagoya University, Japan;(4) Lockheed Martin Advanced Technology Center, Palo Alto, CA, 94304, U.S.A. |
| Abstract: | The Yohkoh solar X-ray observatory carries two telescopes that require coalignment at a level better than the minimum pixel size of 2_45 . This coalignment is needed both internally within Yohkoh and for many scientific applications involving data from ground-based radio and optical observatories. We describe the methods successfully developed for this purpose and now incorporated in the Yohkoh software. Soft X-ray observations of the 1993 transit of Mercury across the solar disk provided key information for the calibration of the coalignment procedures. |
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