Analysis of the Conditions for the Radio Waves Propagation in the Waveguide “Earth-Ionosphere” on the Paths “Novosibirsk-Ulan-Ude” and “Komsomolsk-on-Amur-Ulan-Ude” During Magnetic Storms August 31-September 12, 2017

Bashkuev, Yu. B.; Advokatov, V. R.; Buyanova, D. G.; Pushkarev, Mikhail

doi:10.1051/e3sconf/20186201002

Cited by 7 publications

(3 citation statements)

References 1 publication

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“…Bashkuev et al. (2018) have found significant reduction in the RSDN‐20 signal level at a frequency of 11.9 kHz during this magnetic storm, at a frequency of 14.88 kHz, similar phenomena are also found, but they are less pronounced.…”

Section: Introductionmentioning

confidence: 63%

About the Propagation of RSDN‐20 “Alpha” Signals in the Earth‐Ionosphere Waveguide During Geomagnetic Disturbances

et al. 2022

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IntroductionVLF (very low frequency: 3-30 kHz) waves can be generated by the natural sources (e.g., lightning discharges, energetic electrons in the magnetopshere) and by man-made VLF transmitters. The man-made VLF radiowaves are mainly used for some radio navigation services (such as RSDN-20 ("Alpha") in Russia, Omega in U.S.), time radio stations and for military communication. Due to its good penetration through the water VLF waves are used for the communication with submarines. Though during last decades the satellite signals are more actively used for the communication and navigations, the usage of VLF ground-based receivers is still actual. Since during military actions the VLF communication can be more stable than ordinary satellite communication. The VLF waves from the ground-based transmitters can be used for the study of the lithosphere structure as well. So the study of VLF radio waves propagation is an actual scientific problem.

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Section: Introductionmentioning

confidence: 63%

About the Propagation of RSDN‐20 “Alpha” Signals in the Earth‐Ionosphere Waveguide During Geomagnetic Disturbances

et al. 2022

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“…В связи с этим исследование влияния электронных высыпаний на сигналы ОНЧ остаются актуальными. В последнее время больше внимания уделяется попыткам связать состояние ионосферы с характеристиками ОНЧ-сигналов антропогенной природы, как, например, это делается в работах (Bashkuev et al, 2018; Стародубцев и др., 2019), где используются сигналы РСДН-20 совместно со спутниковыми данными. Исследование состояния нижней ионосферы возможны и по естественным сигналам от молниевых источников, однако антропогенные ОНЧ-источники такие, как системы дальней навигации и системы точного времени, более удобны для задач мониторинга ионосферы вследствие стабильной мощности излучателя.…”

Section: Introductionunclassified

The effect of relativistic electrons precipitating on the RSDN-20 system signal characteristics during the event on March 28, 2017

Ахметов¹,

Belakhovsky²,

Мингалев³

et al. 2023

TKSC RAS NSH

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Based on the experimental data of the EISCAT radar and numerical modeling methods, the influence of the fluxes of subrelativistic (relativistic) electrons of the Earth's outer radiation belt on the operation of the RSDN-20 long-range navigation system operating at frequencies of 11.905 kHz, 12.649 kHz and 14.881 kHz has been studied. As a result of computational experiments, a slight decrease in attenuation under perturbed conditions was obtained at a frequency of 14.881 kHz with a slight, less than an order of magnitude increase in the electron concentration in the D- and E-layers of the ionosphere. At lower frequencies and in the case of an increase in concentration in the reflection region, an increase in signal attenuation is observed. It is shown that the violation of monotonicity in the frequency dependence of signal attenuation is associated with the position of the boundary between regions with different types of signal attenuation and the height of the signal reflection from the ionosphere. In the case when the intersection point of the high-altitude profile of the electron collision frequency υe with the profile of the doubled plasma frequency 2ωe is inside the signal reflection region, a nonlinear type of attenuation dependence on frequency is observed. The phases of RSDN-20 signals are weakly affected by the precipitation of relativistic energy electrons into the atmosphere. A comparison of the amplitudes of the signals obtained in computational experiments and the signals recorded at the observatories of the Polar Geophysical Institute Lovozero and Barentsburg showed partial agreement in most of the changes recorded during the precipitation of subrelativistic electrons in the polar ionosphere. The presented estimates can be used on short radio paths of 100–200 km in the high latitude region to monitor the state of the ionosphere.

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“…Study of propagation of VLF waves under such conditions is necessary because VLF waves are used for navigation. On the other hand, VLF waves propagating in the Earth-ionosphere waveguide are used to control the state of the ionosphere along the path of their propagation in the waveguide [2,3], since their amplitudes and phases are very sensitive to the electrical conductivity of the upper boundaries of the waveguide. It is possible to associate specific types of electron density profiles with amplitude and phase changes using the methods of a computational experiment.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the influence of solar proton events on propagation of VLF radio signals in the polar region

Ахметов

Мингалев

et al. 2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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The effect of proton events of various intensities on the propagation of VLF radio signals are studied by a series of computational experiments. Various events are considered, both real GLE (ground-level enhancement) 70 and 72 and fully synthetic electron density profiles. The profiles were constructed using the RUSCOSMICS and GDMI (Global Dynamic Model of Ionosphere) models developed by the PGI and IZMIRAN. Synthetic profiles obtained using the GDMI model were used as baselines for quiet conditions and subsequent obtaining of disturbed profiles. Modeling of electromagnetic signals was carried out by a numerical model of electromagnetic wave propagation developed at PGI. The signal of the model source was the sum of harmonic oscillations at the frequencies of the RSDN-20 long-range navigation radio system (11905, 12679, 14881 Hz). Amplitude damping coefficients and phase changes are calculated for GLEs of different intensities. Calculations for high-latitude and mid-latitude regions showed the presence of a latitudinal dependence of the influence of GLE events on the amplitudes and phases of the RSDN-20 signals.

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Analysis of the Conditions for the Radio Waves Propagation in the Waveguide “Earth-Ionosphere” on the Paths “Novosibirsk-Ulan-Ude” and “Komsomolsk-on-Amur-Ulan-Ude” During Magnetic Storms August 31-September 12, 2017

Cited by 7 publications

References 1 publication

About the Propagation of RSDN‐20 “Alpha” Signals in the Earth‐Ionosphere Waveguide During Geomagnetic Disturbances

About the Propagation of RSDN‐20 “Alpha” Signals in the Earth‐Ionosphere Waveguide During Geomagnetic Disturbances

The effect of relativistic electrons precipitating on the RSDN-20 system signal characteristics during the event on March 28, 2017

Simulation of the influence of solar proton events on propagation of VLF radio signals in the polar region

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