Yohkoh is a Japan/US/UK mission aiming for the study of high-energy solar physics. Its scientific operations were conducted since early September-1991 through 14-December-2001. Yohkoh was named after the Japanese word meaning 'sunshine'.
Yohkoh scientific instrumentation included a Hard X-ray Telescope (HXT), a Soft X-ray Telescope (SXT), a Bragg Crystal Spectrometer (BCS), and a Wide-Band Spectrometer (WBS). These instruments are described in a series of papers in Solar Physics, vol. 136 (1991). First results have been published in Publ. Astron. Soc. Japan, vol 44 (1992). A bibliography of Yohkoh-related publications may be found at http://www.lmsal.com/~aschwand/publications/yohkoh.html.
Yohkoh steadily continued its observation more than ten years, and
this made Yohkoh the world's first space mission to provide solar images
over a whole solar cycle. On 14-Dec-2001, however, observing an annular
eclipse, Yohkoh lost its attitude control and became unable to
Signals from Yohkoh was monitored for more than 2 years after the
end of scientific operation. Yohkoh re-entered the earth on
12-Sep-2005 and burned out in the atomoshpere somewhere above the
point (24N, 85E).
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