Abstract
The HXIS, a joint instrument of the Space Research Laboratory at Utrecht, The Netherlands, and the Department of Space Research of the University of Birmingham, U.K., images the Sun in hard X-rays: Six energy bands in energy range 3.5–30 keV, spatial resolution 8″ over Ø 2′40″ and 32″ over Ø 6′24″ field of view, and time resolution of 0.5–7 s depending on the mode of operation. By means of a ‘flare flag’ it alerts all the other SMM instruments when a flare sets in and informs them about the location of the X-ray emission. The experiment should yield information about the position, extension and spectrum of the hard X-ray bursts in flares, their relation to the magnetic field structure and to the quasi-thermal soft X-rays, and about the characteristics and development of ‘type IV’ electron clouds above flare regions.
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Van Beek, H.F., Hoyng, P., Lafleur, B. et al. The Hard X-ray Imaging Spectrometer (HXIS). Sol Phys 65, 39–52 (1980). https://doi.org/10.1007/BF00151383
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DOI: https://doi.org/10.1007/BF00151383