Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Berngardt, O. I."'
Based on ray tracing in a smooth ionosphere described by the IRI-2016 model we have infered the seasonal-diurnal dynamics of radio noise observed by four mid-latitude HF radars. In the calculations, noise is assumed to propagate from the radar dead z
Externí odkaz:
http://arxiv.org/abs/2107.11532
Publikováno v:
Solar-Terrestrial Physics, Vol 9, Iss 1, Pp 56-67 (2023)
Ionosphere has an important impact on the quality of radio communication, radar, and global positioning. One of the essential characteristics describing the state of the ionosphere is its critical frequency fₒF2. Its prediction provides effective m
Externí odkaz:
https://doaj.org/article/598e526c1f064463b5c7907c74845f31
Autor:
Berngardt, O. I., Ruohoniemi, J. M., St-Maurice, J. -P., Marchaudon, A., Kosch, M. J., Yukimatu, A. S., Nishitani, N., Shepherd, S. G., Marcucci, M. F., Hu, H., Nagatsuma, T., Lester, M.
Publikováno v:
Space Weather, 2019
An analysis of noise attenuation during eighty solar flares between 2013 and 2017 was carried out at frequencies 8-20 MHz using thirty-four SuperDARN radars and the EKB ISTP SB RAS radar. The attenuation was determined on the basis of noise measureme
Externí odkaz:
http://arxiv.org/abs/1812.08878
Autor:
Berngardt O. I.
Publikováno v:
Solar-Terrestrial Physics, Vol 8, Iss 4, Pp 63-72 (2022)
The paper describes the current version (v.1.1) of the algorithm for automatic classification of signals received by ISTP SB RAS decameter coherent scatter radars. The algorithm is a self-learning neural network that determines the type of scattered
Externí odkaz:
https://doaj.org/article/fe585d8b6c1645c6a74f6338f0d2503a
The analysis of the scattered signal was carried out in the cases of ground scatter and ionospheric scatter. The analysis is based on the data of the decameter coherent EKB ISTP SB RAS radar. In the paper the signals scattered in each sounding run we
Externí odkaz:
http://arxiv.org/abs/1811.02992
Based on the Irkutsk fast monostatic chirp ionosonde data we made a statistical analysis of ionospheric effects for 28 earthquakes which appeared in 2011-2016 years. These effects are related with surface (Rayleigh) seismic waves far from epicenter.
Externí odkaz:
http://arxiv.org/abs/1609.08366
The quadratic scalar radar equations are obtained for SuperDARN radars that are suitable for the analysis and interpretation of experimental data. The paper is based on a unified approach to the obtaining radar equations for the monostatic and bistat
Externí odkaz:
http://arxiv.org/abs/1605.01906
Autor:
Berngardt, O. I., Perevalova, N. P., Kutelev, K. A., Zherebtsov, G. A., Dobrynina, A. A., Shestakov, N. V., Zagretdinov, R. V., Bakhtiyarov, V. F., Kusonsky, O. A.
We present the results of a study of the azimuthal characteristics of ionospheric and seismic effects of the meteorite 'Chelyabinsk', based on the data from the network of GPS receivers, coherent decameter radar EKB SuperDARN and network of seismic s
Externí odkaz:
http://arxiv.org/abs/1506.05863
Publikováno v:
Solar-Terrestrial physics, 24, 3-14, 2013 (in russian)
This paper presents the analysis of ionospheric effects in the region close to the Chelyabinsk meteorite explosion at 03:20UT 2013 February 15 from the Institute of Solar-Terrestrial Physics of Siberian Branch of Russian Academy of Sciences (ISTP SB
Externí odkaz:
http://arxiv.org/abs/1308.3918
Autor:
Berngardt, O. I., Potekhin, A. P.
We show that the dispersion relation for gradient-drift and Farley-Buneman instabilities within the approximation of the two-fluid MHD should contain the terms which are traditionally supposed to be small. These terms are caused by taking into accoun
Externí odkaz:
http://arxiv.org/abs/1004.1710