Yohkoh (Solar-A) observations of solar activity |
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| Affiliation: | 1. Ioffe Institute, Saint Petersburg, Russia;2. Spectral-Tech, AO, Saint Petersburg, Russia;3. TRINITI, Troitsk, Russia;4. ITER Organization St. Paul Lez Durance Cedex, France;5. Fraunhofer IST, Braunschweig, Germany;1. Department of Chemistry, University of North Texas, 1155 Union Circle 305070, Denton, TX, 76203, USA;2. Applied Materials Inc., 3050 Bowers Ave, Santa Clara, CA, 95054, USA;1. Université Tunis El Manar, Faculté des Sciences de Tunis, Département de Physique, LR99ES13 Laboratoire de Physique de la Matière Condensée (LPMC), 2092 Tunis Tunisie, Tunisia;2. National Centre for Nuclear Science and Technology Tunis (CNSTN), Rte de Tunis, 2020 Sidi Thabet Ariana, Tunisia;3. Laboratoire de Magnétisme et Spectroscopie des Solides (LM2S), Département de Physique, Faculté des Sciences, Université Badji Mokhtar, Annaba B.P. 12, 23000 Annaba, Algeria;1. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;2. University of Chinese Academy of Sciences, Beijing 100039, China;3. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China;4. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
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| Abstract: | 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. We anticipate 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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