Resik: A Bent Crystal X-ray Spectrometer for Studies of Solar Coronal Plasma Composition |
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| Authors: | J Sylwester I Gaicki Z Kordylewski M Kowaliński S Nowak S P?ocieniak M Siarkowski B Sylwester W Trzebiński J Baka?a J L Culhane M Whyndham R D Bentley P R Guttridge K J H Phillips J Lang C M Brown G A Doschek V D Kuznetsov V N Oraevsky A I Stepanov D V Lisin |
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| Institution: | (1) Space Research Centre, Polish Academy of Sciences, 51-622 Kopernika 11, Wroc aw, Poland;(2) Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, U.K.;(3) National Research Council Senior Research Associate, Code 682, NASA Goddard Space, Flight Center, Greenbelt, MD, 20771, U.S.A.;(4) Space Science and Technology Department, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K.;(5) E. O. Hulburt Center for Space Research, Code 7670, Naval Research Laboratory, Washington, DC, 20375-5352, U.S.A.;(6) Institute of Terrestrial Magnetism and Radiowave Propagation (IZMIRAN), Troitsk, Moscow, Russia |
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| Abstract: | We describe the RESIK (REntgenovsky Spektrometr s Izognutymi Kristalami) instrument, consisting of two double-channel X-ray spectrometers, designed to observe solar active region and flare plasmas. RESIK is one of the instruments making up the scientific payload of the Russian CORONAS-F solar mission. The uncollimated spectrometer uses two silicon and two quartz bent crystals observing flare, active region and coronal spectra in four wavelength bands with a resolving power ( / ) of  1000. The wavelength coverage, 3.3–6.1 Å, includes emission lines of Si, S, Cl, Ar, and K and in the third diffraction order, the wavelength range includes He-like Fe lines (1.85 Å) and Ni lines (1.55 Å) with dielectronic satellites, emitted during intense, hot flares. The instrument is believed to be the best calibrated space-borne crystal spectrometer flown to date. The spectrometer dynamically adjusts the data gathering intervals from 1 s to 5 minutes, depending on the level of solar X-ray emission at the time of observation. The principal aims of RESIK are the measurements of relative and absolute element abundances in the emitting plasma and the temperature distribution of plasma (differential emission measure) over the temperature interval 3 and 50 MK. This paper summarizes the scientific objectives of RESIK and describes the design, characteristics, and performance of the instrument. |
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