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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Eugene A. Vishnyakov, Sergey A. Bogachev, Alexey S. Kirichenko, Anton A. Reva, Ivan P. Loboda, Ilya V. Malyshev, Artem S. Ulyanov, Sergey Yu. Dyatkov, Nataliya F. Erkhova, Andrei A. Pertsov, and Sergey V. Kuzin, "Joint observations of solar corona in space projects ARKA and KORTES," Proc. SPIE 10235, EUV and X-ray Optics: Synergy between Laboratory and Space V, 102350B (Presented at SPIE Optics + Optoelectronics: April 27, 2017; Published: 31 May 2017); https://doi.org/10.1117/12.2264989.