The work continues the research started in 2017. In 2018 in addition to constant monitoring of the night sky glow, a series of experiments were carried out to register fast variations in the spatial intensity distribution of the night sky radiation in the spectral range of 400–900 nm by an optical instruments complex. The devices complex includes: A photometer assembled on the basis of SONY ICX285AL CCD matrix and a high-aperture lens Jupiter 3; Highly sensitive optical system created on the basis of the 3rd generation EPM102G-04-22C electron-optical converter (EOC) and the Baumer HXG40NIR camera based on CMOSIS CMV4000 1 matrix; Fast four-channel photometer with sensors based on silicon photomultipliers. The paper presents the results of experiments on the synchronous observation of fast optical phenomena in the Earth’s atmosphere. The number of events recorded simultaneously on multiple devices is given. We describe methods and algorithms for extracting events from data series.
In this study, we analyze a specific type of propagation of decameter radio waves connected with lateral reflections of radio signals from ionospheric irregularities at the F-region altitudes. This feature is appeared in registration at the distance-frequency characteristics (ionograms) flat tracks with group paths exceeding ones for standard reflections from F2-region altitudes and maximum observed frequencies (MOF) exceeding MOF1F2. Non-great-circle HF radio signals propagation is considered for the Dikson – Norilsk, Amderma – Norilsk, and Salekhard – Norilsk paths using ionograms obtained in January and April 2016. 79 events of NGC-reflections during the studied period were registered. Among them, 45 events were observed in evening and night hours. Other NGC-events were registered in the day time.
In this work, the morphological investigation of maximum observed frequencies (MOF) and delays of interlayer signal over latitudinal path Khabarovsk – Tory in February 2014, has been carried out. Along with MOF and delays of regular 1F, 2F, 2E modes of high-frequency propagation we registered parameters of 1FN and 2Es modes. As a result of our study, we conclude that the interlayer signal is registered most often in the day time. This is connected with the E layer presence. At night time registration of 1FN mode is stipulated with the Es-layer presence over the decameter wave signal propagation path. Wave-like variations of MOF1FN and MOF2Es are registered on February 24 and February 28, 2014.
We present preliminary observational results of short-period variations in the night sky airglow at middle latitudes. Observations were performed by using a CCD-based photometer over 2016 December to 2017 March. The main objective of our study is to determine a possibility of using a CCD camera to record fast optical flashes, and check a capability to separate signals from satellites, meteors, ground lightning discharges, etc. We describe automatic algorithms to select a frame with a flash and to identify the flash type. Based on the primary database of flashes, a preliminary statistical analysis of the results of observations was performed.