ИСТИНА

VDNH-80 is a 3U cubsat which was launched on July, 5th 2019 from cosmodrom Vostochny. Scientific payload of the satellite includes UV radiation detector AURA (Atmospheric UV RAdiation). It is a compact detector based on silicon photomultipliers (SiPM) intended to measure radiation in a wide wavelengths band 300-800 nm. The sensor part of the detector consists of 4 SiPMs with different UV filters in front of three of them (UFS1, UFS2, FS6). One SiPM is without filter. A special collimator limits the field of view of the detectors up to 30 degrees (HWHM). Sensitivity of SiPMs is controlled by a specially developed automatic gain control circuit which allows detector to operate in various illumination conditions (from darkest places on the night side of the orbit to a direct sun light). The detector measures UV radiation with a temporal resolution of 1 s, calculates STD of signal to estimate signal variations between measurements and has digital thermometers placed nearby SiPMs. In this work we present detector structure and principles of its operation, as well as results of first measurements.