Figure 1 - available via license: Creative Commons Attribution 4.0 International
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Photometric model CCD camera frame oriented to the cardinal points. The elevation angles are plotted along the axes (zenith is 90°). The black circle marks the 557.7 nm photometer channel FOV. The white rectangle is the region with the greatest response to pumping during the E s layer evolution.
Source publication
The results of analysis of the experimental data collected on 5 September 2021 on 557.7 and 630 nm artificial airglow of the ionosphere induced by powerful HF radio waves at the SURA facility are presented. For optical measurements, a photometric suite located directly next to the SURA facility was used. Fast variations in the atmospheric emission...
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Plain Language Summary
The appearance of the sporadic E (Es) layer is an occasional phenomenon in the ionosphere. Its height typically overlaps with the E layer at 90–130 km. The electron density of the Es layer is generally higher than that of the background E layer and can cause radio signal reflections. Existing studies have already proven that...
Citations
... During the active experiments at the "SURA" heating facility related to the ionospheric artificial airglow (557.7 nm atomic oxygen line) registration in August 2022, the ION-FAST prototype was used for a permanent control of the sporadic E layer and frequency with no necessity to put a technological pause into the facility operation scheme. The techniques of such experiments and the results of the analysis of data obtained are described in [35,36]. It was shown in [13] that recording ionograms at a rate of 1 ionogram per second makes it possible to reveal that the characteristics of the Es layer can change quite quickly (in a time of the order of several seconds). ...
In December 2021, we presented a prototype of a fast ionosonde for vertical sounding based on the usage of publicly available radio-electronic components. This approach led to a major reduction in the cost of the created device. We called our development ION-FAST, which characterizes the key feature of the ionosonde: the possibility of continuous operation at a speed of one ionogram per second, which is required to study the rapid processes of redistribution of the electron concentration during heating experiments. In May 2022, an ionosonde for vertical sounding of the ionosphere, developed at the Radiophysical Research Institute of Nizhni Novgorod (NIRFI), was put into continuous operation at the SURA facility. This report provides a description of the improvements made to the prototype over the last year and the path to be passed from idea to implementation. The results of the first months of the prototype’s operation (especially the results of the supporting optic experiment in August 2022), as well as prospects for further use and modernization, are provided. In addition, the realization of the oblique chirp-sounding receiver prototype as an extension of the proposed diagnostic platform’s functionality, including the first results, is presented.
... orientation of the pump beam and characteristics of the resulting excited region), studying the artificial ionization in the perturbed region e.t.c. [1], determination of electric fields, diffusion coefficients and wind velocities of the neutral upper atmosphere [2], estimation of the electron energy distribution [3] and the study of energy characteristics of suprathermal electrons and experimental verification of theoretical models of their acceleration and transport away from the turbulent layer [4]. The most common observed airglow in these experiments is the red and secondarily the green airglow. ...
In this paper we use previously calculated ionosphere electron temperatures Te in order to estimate the 6300Å (red) airglow intensity enhancements attributed to thermal electrons from the tail of a Maxwellian electron distribution of sufficiently increased electron temperature. Then, we compare our results with the relevant observed measurements and we comment on the quality of the comparison and the possible causes of the differences. We also calculate the airglow intensity characteristic rise and decay times and compare them to the experimental ones, and we investigate the origin of the electrons which excite the red airglow. In the end, we assess the departure of the ionosphere electron energy distribution from a purely Maxwellian one, and the role of the electron elastic and inelastic collisions with the other components of the ionospheric F-region.
