ИСТИНА

Moscow State University in collaboration with other Russian and foreign institutions is preparing a new scientific and educational satellite Lomonosov. Scientific payload of these satellite contains ultra high energy cosmic rays (UHECR) detector TUS. It will observe faint fluorescent tracks of extensive air shower (EAS), produced by a primary energetic particle in the atmosphere. TUS consists of large Fresnel-type mirror-concentrator and photo receiver placed in the focal plane (matrix of 16x16 PM tubes with a spatial resolution in the atmosphere ~ 5 km). Electronics allow to achieve a microsecond time sampling for the fastest events and sub-millisecond time resolution for the slower ones (transient luminous events, micro-meteors). In addition to the main photo receiver, which measure UV light collected by a mirror, there was installed a pin-hole camera with two multi anode PM tubes orientated directly to the atmosphere. It has the same FOV, but smaller aperture ratio. Detector TUS will produce measurements of TLE initial stage with high temporal resolution and very low threshold. It gives opportunity to measure dim flashes in the upper atmosphere, which were observed by Tatiana-2 satellite and obtain there spatial structure. After the saturation of photo receiver in case of powerful TLE measurements continue by pin-hole camera. In the presented work a possibility of transient luminous events measurements from space by TUS detector with high sensitivity and temporal resolution is discussed.