Remote Sensing of the Atmosphere by the Ultraviolet Detector TUS Onboard the Lomonosov Satellite

Abstract

The orbital detector TUS (Tracking Ultraviolet Setup) with high sensitivity in near-visible ultraviolet (tens of photons per time sample of 0.8 μ s of wavelengths 300–400 nm from a detector’s pixel field of view) and the microsecond-scale temporal resolution was developed by the Lomonosov-UHECR/TLE collaboration and launched into orbit on 28 April 2016. A variety of different phenomena were studied by measuring ultraviolet signals from the atmosphere: extensive air showers from ultra-high-energy cosmic rays, lightning discharges, transient atmospheric events, aurora ovals, and meteors. These events are different in their origin and in their duration and luminosity. The TUS detector had a capability to conduct measurements with different temporal resolutions (0.8 μ s, 25.6 μ s, 0.4 ms, and 6.6 ms) but the same spatial resolution of 5 km. Results of the TUS detector measurements of various atmospheric emissions are discussed and compared to data from previous experiments.

Application of Neural Networks to Classification of Data of the TUS Orbital Telescope

“…Miscellaneous examples of events of all types can be found in [12][13][14][15][16][17]. Please note that the four classes of events were not disjoint: in some cases an event of one type was registered simultaneously with an event of another type within one data record.…”

“…The data set obtained with TUS has demonstrated that an unexpected variety of different processes are taking place in the nocturnal atmosphere of the Earth in the ultraviolet (UV) range. Considerable efforts have been put in the analysis of the TUS data, see, e.g., [13][14][15][16][17]. Until recently, all of them were based on conventional approaches.…”

The First Application of Neural Networks to the Analysis of the TUS Orbital Detector Data

“…Miscellaneous examples of events of all types can be found in [12][13][14][15][16][17]. Note that the four classes of events were not disjoint: in some cases an event of one type was registered simultaneously with an event of another type within one data record.…”

Связь Временных Вариаций Корональных Выбросов Массы И Крупномасштабных Событий В Солнечном Ветре С Появлением SCв 23 И 24 Циклах Солнечной Активности.

“…Поле зрения одного пикселя на поверхности Земликвадрат 5×5 км, общее поле зрения составляет 80×80 км [Klimov et al, 2017]. Высокая чувствительность и несколько режимов работы, отличающиеся временным разрешением (0.8 мкс, 25.6 мкс, 0.4 мс и 6.6 мс), позволили регистрировать и изучать свечения разнообразной природы: метеоры, антропогенное свечение, грозовые явления (молнии и высоко атмосферные транзиентные световыя явления) и пр., провести измерения УФ треков в атмосфере Земли [Khrenov et al, 2020;Klimov et al, 2019], а также УФ пульсаций в высоких широтах, представленных в данной работе.…”