Yohkoh (Solar-A) observations of solar activity.

Details Yohkoh (Solar-A) observations of solar activity. Yohkoh (Solar-A) observations of solar activity.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57.1361o&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, Vol. 57, No. 12, p. 1361 - 1368

Physics

Soft X Rays: Solar Corona, Soft X Rays: Solar Flares

Scientific paper

The Yohkoh satellite, launched 31 August 1991, observes solar X-rays and γ-rays with four instruments. This paper briefly introduces Yohkoh, emphasizing its recent observations of the solar corona as seen in soft X-radiation. The Yohkoh soft X-ray telescope (SXT) has a CCD sensor and a grazing-incidence mirror with greatly reduced scattering in comparison with earlier telescopes of this type. With these and other advantages it provides the most sensitive and detailed views of the X-ray emission corona. Long exposures regularly show detectable emission from heights exceeding one solar radius above the photosphere. The main observational objectives of SXT are in flare research, but observations of other coronal structures are equally significant. The author anticipates important applications of the Yohkoh/SXT data in defining physical parameters of the corona during the Ulysses and SOHO observations of the solar wind and corona. This instrument was recently used to make unique X-ray observations of a transit of Mercury.

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