Spatiotemporal distributions of the electron density in the ionosphere by records of the total electron content and phase of VLF radio signals

Гаврилов, Б. Г.; Zetser, Yu. I.; Lyakhov, A. N.; Poklad, Yu. V.; Ryakhovskii, I. A.

doi:10.1134/s0016793217040065

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…Disturbances of the electron density and radio wave propagation in the D, E, and F regions of the ionosphere were investigated in the latitude range from 40°to 70°N and in the longitude range from 0°to 40°E. The "Mikhnevo" geophysical observatory (MIK, 54.9617°N, 37.7626°E) of the Institute of Geosphere Dynamics of the Russian Academy of Sciences (http://idg.chph.ras.ru/ru/watch/mikhnevo) continuously monitors the amplitudes and phases of signals in the frequency band from 9 to 30 kHz received from VLF stations located in Europe, Asia, and North America [14].…”

Section: Methodsmentioning

confidence: 99%

The Influence of the Lower Ionospheric Disturbances on the Operating Conditions of Navigation Satellite Systems

Гаврилов¹,

Poklad²,

Ryakhovskiy³

2020

Satellites Missions and Technologies for Geosciences

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The study of the impact of ionospheric disturbances on the conditions of functioning of satellite communication and navigation systems and the development of methods to reduce this effect requires the development of methods for evaluating the parameters of ionospheric disturbances and their spatial and temporal distribution. Studies show that electron concentration disturbances, which can have a significant impact on the functioning of transionospheric radio channels, can occur both in the upper and lower ionosphere. At the same time, the methods of studying the dynamics of ionospheric disturbances in the lower ionosphere are not enough developed, and the interrelation of the lower and upper perturbations of the ionosphere is insufficiently studied. The aim of the work is an experimental study of disturbances of the upper and lower ionosphere in order to clarify the mechanisms of their relationship and study the spatiotemporal distribution of mid-latitude disturbances. The results obtained show that the contribution of the electron density disturbances in the D region to the total electron content of the ionosphere can be significant and considerably depends on the type of heliogeophysical processes.

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Section: Methodsmentioning

confidence: 99%

The Influence of the Lower Ionospheric Disturbances on the Operating Conditions of Navigation Satellite Systems

Гаврилов¹,

Poklad²,

Ryakhovskiy³

2020

Satellites Missions and Technologies for Geosciences

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“…Известно, что на состояние и динамику нижней ионосферы оказывают влияние многие геофизические факторы, среди которых наиболее существенными являются: рентгеновское излучение Солнца, магнитные и ионосферные бури, атмосферные возмущения, вызванные падением метеоритов, извержения вулканов, мощные землетрясения [Kumar, Kumar, 2018;Adushkin et al, 2007;Gavrilov et al, 2017;Popova et al, 2013;Gavrilov et al, 2019;Спивак, Рябова, 2019]. Высыпания заряженных частиц, которые приводят к дополнительной ионизации Е-слоя ионосферы, понижению высоты отражения ОНЧ радиосигналов, изменению их фазы и снижению амплитуды, особенно в ночное время, [Lynn, 2013;Kumar, Kumar, 2014;Foster et al, 2016] -являются еще одним важным агентом возмущений нижней ионосферы.…”

Section: Introductionunclassified

Effect of Solar X-Ray Radiation and Proton Precipitations on the Amplitude of VLF Signals

Гаврилов,

Ряховский,

Поклад

2023

Динамические Процессы В Геосферах

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Анализ и сравнение эффектов и механизмов воздействия на D, E области ионосферы рентгеновского излучения Солнца и высыпаний заряженных частиц – цель данной работы. В статье исследуются среднеширотные эффекты, которые не получили достаточного освещения в научной литературе. Анализируется изменение параметров радиосигналов, принимаемых в геофизической обсерватории ИДГ РАН «Михнево» от европейских ОНЧ передатчиков, для ряда событий в сентябре 2017 года, когда наблюдались рентгеновская вспышка класса Х8.2 и последующее протонное высыпание. Оба явления приводят к росту концентрации электронов в нижней ионосфере, но различаются по воздействию на параметры радиосигналов. Воздействие рентгеновского излучения, приводящее к росту амплитуды радиосигналов, наблюдается только в дневное время; воздействие протонных высыпаний проявляется в виде ночного снижения амплитуды. The paper aims to analyze and compare the effects and mechanisms of influence on the D and E regions of the ionosphere of the Sun’s X-ray radiation and charged particle precipitations. The work investigates mid- latitude effects, which have not received sufficient coverage in the scientific literature. We analyze changes in the parameters of radio signals received at the IDG RAS Mikhnevo Observatory from European VLF transmitters for a series of events in September 2017, when an X8.2-class X-ray flare and subsequent proton precipitation were observed. Both events lead to an increase in the electron density in the lower ionosphere, but differ in their impact on radio signal parameters. The impact of X-ray radiation leading to an increase in the amplitude of radio signals is observed only in the daytime. The impact of proton rashes is manifested as a nighttime decrease in amplitude.

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“…This work is devoted to modeling the lower ionosphere during solar X‐ray flares of different classes and analysis of the results obtained by verification with ground‐based radiophysical measurements taken at the Mikhnevo geophysical observatory of the Sadovsky Institute of Geospheres Dynamics (Gavrilov et al., 2017, 2019a).…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Lower Ionosphere During Solar X‐Ray Flares of Different Classes

2021

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This study presents the results obtained from modeling the lower ionosphere response to C‐, M‐ and X‐class solar X‐ray flares. This model is based on a 5‐component scheme for the ionization‐recombination cycle of the ionospheric D‐region. Input parameters for the plasma‐chemical model under different heliogeophysical conditions corresponding to selected X‐ray flares were determined by using data received from the AURA, SDO, and GOES satellites. Verification of the obtained results was carried out with use of ground‐based radiophysical measurements taken at the geophysical observatory Mikhnevo. The results obtained from a comparison of the calculated and experimental radio wave amplitude variations along six European very low frequency (VLF) paths show that the average normalized root mean square error is ∼7%, 14%, and 18% for C‐, M‐, and X‐class flares, respectively. Qualitative and quantitative analysis of the verification results for the VLF signal amplitude show good predictive capability of the model built for describing weak and moderate ionospheric disturbances.

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Spatiotemporal distributions of the electron density in the ionosphere by records of the total electron content and phase of VLF radio signals

Cited by 10 publications

References 6 publications

The Influence of the Lower Ionospheric Disturbances on the Operating Conditions of Navigation Satellite Systems

The Influence of the Lower Ionospheric Disturbances on the Operating Conditions of Navigation Satellite Systems

Effect of Solar X-Ray Radiation and Proton Precipitations on the Amplitude of VLF Signals

Modeling of the Lower Ionosphere During Solar X‐Ray Flares of Different Classes

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