We present characterization measurements of dark current signal at different temperatures and spectral sensitivity of cooled backside-illuminated EUV CCD matrices intended for future solar space missions, including projects ARKA and KORTES. The measurements have been conducted inside a vacuum chamber in the 125-250 Å spectral range with the use of tungsten laser-driven plasma as a source of EUV radiation. Applications of the EUV CCDs for contemporary and future space investigations of solar physics taking place in solar flares is being overviewed and discussed.
ARKA and KORTES are two upcoming solar space missions in extreme ultraviolet and X-ray wavebands. KORTES is a sun-oriented mission designed for the Russian segment of International Space Station. KORTES consists of several imaging and spectroscopic instruments that will observe the solar corona in a number of wavebands, covering EUV and X-ray ranges. The surveillance strategy of KORTES is to cover a wide range of observations including simultaneous imaging, spectroscopic and polarization measurements. ARKA is a small satellite solar mission intended to take highresolution images of the Sun at the extreme ultraviolet wavelengths. ARKA will be equipped with two high-resolution EUV telescopes designed to collect images of the Sun with approximately 150 km spatial resolution in the field of view of about 10'×10'. The scientific results of the mission may have a significant impact on the theory of coronal heating and may help to clarify the physics of small-scale solar structures and phenomena including oscillations of fine coronal structures and the physics of micro- and nanoflares.
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