ИСТИНА

Moscow State University in collaboration with other Russian and foreign institutions is preparing a new scientific and educational satellite Lomonosov. Its scientific payload consists of various detectors which measurements directed mostly to extreme processes in the far Universe (gamma ray bursts – GRB and ultra high energy cosmic rays – UHECR). Near Earth extreme phenomena, like atmospheric transient luminous events (TLE) can be considered as additional scientific objectives for detector TUS. The UHECR detector TUS will observe faint fluorescent tracks of extensive air shower (EAS), produced by a primary energetic particle in the atmosphere. For this purpose the detector contains a large Fresnel-type mirror-concentrator (~2 m2) 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 for the slower ones. 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. The main photo receiver of TUS detector will measure more faint light (EAS fluorescence, TLE initial stage, meteor tracks). In case of large signal and TUS electronics saturation, the pin-hole camera will continue measurements and provide additional information about luminous events. Estimations of TLE frequency and their intensity in UV wavelength range could be done based on Tatiana-2 satellite data. In the presented work a possibility of transient luminous events measurements from space by TUS detector with high sensitivity and temporal resolution is discussed.