ИСТИНА

In September 2021 a new optical complex including a high sensitive imaging photometer was installed in the Verkhnetulomsky observatory of the Polar Geophysical Institute. This instrument has an optical system that allows to measure near ultraviolet (NUV) atmospheric emission with a multi-anode photomultiplier tubes (PMT) matrix. The detector is installed next to one of the all-sky cameras and its field of view coincides with the central part of the camera’s field of view (20°×20°), so the intensity of atmospheric luminosity can be measured in the NUV and optical range simultaneously, and it is possible to make complementary observations using a widely used cameras with 1 s temporal resolution and new photometer with 1 ms time sampling. High temporal resolution allows us to study fine structure of fast-changing aurora luminosity. This report will present results of case study based on joint observations of pulsating auroras with a high temporal resolution in the NUV and optical ranges from one night (March 6-7, 2022). This event has a variety of spatial-temporal patterns of emission during including characteristic examples of pulsating aurora. Thus, the results of a detailed frequency analysis, analysis of observation conditions and geomagnetic activity will be presented. Events analysis algorithms are being developed based on the first year observations data for the further operation of the imaging photometers system. The research is supported by a grant from the Russian Science Foundation (project No.22-62-00010)