V. Grimalsky
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View article: Planetary-scale nonlinear MHD excitation in quasi-2D ionosphere from the first principles
Planetary-scale nonlinear MHD excitation in quasi-2D ionosphere from the first principles Open
A new model of planetary-scale nonlinear magnetohydrodynamic excitations (PMHDE) has been developed for the F-region of the ionosphere. The model preserves the original MHD equations without introducing additional curl operations and accou…
View article: Modeling and experimental investigations for Modern Radio-Diagnostics of the impacts on ionosphere “from above and from below” using LOFAR and GNSS Data
Modeling and experimental investigations for Modern Radio-Diagnostics of the impacts on ionosphere “from above and from below” using LOFAR and GNSS Data Open
Over the past 10 years, increasingly intensive studies of ionospheric plasma structures have been carried out using data from the Low-Frequency Array for radio astronomy (LOFAR) radio telescope system. Recently more and more attempts are t…
View article: Experimental data and models for radio diagnostics of extreme impacts “from below” on ionospheric space weather: LOFAR data on ionospheric acoustic-range perturbations caused by Hunga-Tonga volcano eruption.
Experimental data and models for radio diagnostics of extreme impacts “from below” on ionospheric space weather: LOFAR data on ionospheric acoustic-range perturbations caused by Hunga-Tonga volcano eruption. Open
The 2022 Hunga Tonga Volcano Eruption (HTVE) had unprecedented impacts on atmospheric space weather. It provided a clear example of how space weather may be impacted by influences both “from above” (e.g. the solar wind, geo-mag…
View article: Excitation of ULF, ELF, and VLF Resonator and Waveguide Oscillations in the Earth–Atmosphere–Ionosphere System by Lightning Current Sources Connected with Hunga Tonga Volcano Eruption
Excitation of ULF, ELF, and VLF Resonator and Waveguide Oscillations in the Earth–Atmosphere–Ionosphere System by Lightning Current Sources Connected with Hunga Tonga Volcano Eruption Open
The simulations presented here are based on the observational data of lightning electric currents associated with the eruption of the Hunga Tonga volcano in January 2022. The response of the lithosphere (Earth)–atmosphere–ionosphere–magnet…
View article: Linear and nonlinear resonant properties of electron gas in n-InSb and graphene layers in terahertz range in bias magnetic fields
Linear and nonlinear resonant properties of electron gas in n-InSb and graphene layers in terahertz range in bias magnetic fields Open
The nonlinear conductivity of 2D electron gas in graphene and 3D electron gas in the narrow-gap n- InSb semiconductor has been simulated in terahertz (THz) range by various methods including the direct quantum approach, the quasi-classical…
View article: Experimental data and models for radio diagnostics of extreme impacts “from above” and “from below” on ionospheric space weather: VLF, LOFAR and GNSS
Experimental data and models for radio diagnostics of extreme impacts “from above” and “from below” on ionospheric space weather: VLF, LOFAR and GNSS Open
Radio diagnostics, including scattering of electromagnetic waves (EMW) by spatiotemporal disturbances of the ionospheric plasma in the ELF (Extremely Low Frequencies, Hz), VLF (Very Low Frequencies, kHz), HF (High Frequencies, MHz) and mic…
View article: ULF perturbations: modeling Earth-Atmosphere-Ionosphere coupling, signal processing using information entropy, determination of the electric and magnetic field components and “experiment-theory comparison“
ULF perturbations: modeling Earth-Atmosphere-Ionosphere coupling, signal processing using information entropy, determination of the electric and magnetic field components and “experiment-theory comparison“ Open
We have used 2014–2017 data from the eight receiving stations of the Japan very low frequency (VLF) monitoring network. The nighttime data of the signals of the JJI transmitter on Kyushu Island, excited VLF electromagnetic waves (EMW…
View article: Generation of Higher Terahertz Harmonics in Nonlinear Paraelectrics under Focusing in a Wide Temperature Range
Generation of Higher Terahertz Harmonics in Nonlinear Paraelectrics under Focusing in a Wide Temperature Range Open
It is theoretically investigated the generation of higher harmonics of two-dimensional and three-dimensional terahertz electromagnetic beams in nonlinear crystals. The attention is paid to crystalline paraelectrics like SrTiO3 under the te…
View article: Novel Electrothermal Microgrippers Based on a Rotary Actuator System
Novel Electrothermal Microgrippers Based on a Rotary Actuator System Open
Microgrippers are devices that have found applications in various fields of research and industry. They are driven by various actuation methods. In this article, an electrothermal rotary actuator recently proposed in the literature is expl…
View article: Spectral Analysis and Information Entropy Approaches to Data of VLF Disturbances in the Waveguide Earth-Ionosphere
Spectral Analysis and Information Entropy Approaches to Data of VLF Disturbances in the Waveguide Earth-Ionosphere Open
Very low frequency (VLF) signals are considered as an important tool to study ionosphere disturbances. We have studied variations in signal amplitude of the Japanese JJI transmitter received by a network of eight Japan stations. The distin…
View article: Results of the analysis of VLF and ULF perturbations and modeling atmosphere-ionosphere coupling
Results of the analysis of VLF and ULF perturbations and modeling atmosphere-ionosphere coupling Open
<p>The work continues one presented by us in 2021, which included the identification of three groups of periods in the VLF amplitude variations in the waveguide Earth-Ionosphere (WGEI) according to data of Japan receivers, obtained i…
View article: ULF Activity in the Earth Environment: Penetration of Electric Field from the Near-Ground Source to the Ionosphere under Different Configurations of the Geomagnetic Field
ULF Activity in the Earth Environment: Penetration of Electric Field from the Near-Ground Source to the Ionosphere under Different Configurations of the Geomagnetic Field Open
The problem with the penetration of electric fields from atmospheric near-Earth electric current sources to the ionosphere is investigated both within the dynamic simulations of the Maxwell equations in the frequency domain and within the …
View article: Generation of sequences of strong electric monopulses in nitride films
Generation of sequences of strong electric monopulses in nitride films Open
This paper presents theoretical investigation of the excitation of the sequences of strong nonlinear monopulses of space charge waves from input small envelope pulses with microwave carrier frequencies due to the negative differential cond…
View article: Different Geometries of Superheterodyne Amplification of Electromagnetic Beams in Waveguides Nitride-Dielectric
Different Geometries of Superheterodyne Amplification of Electromagnetic Beams in Waveguides Nitride-Dielectric Open
The superheterodyne amplification of electromagnetic waves is investigated when the resonant three-wave interaction of two electromagnetic waves with the space charge wave occurs in the waveguides nitride n-GaN, n-InN films-dielectric. The…
View article: Nonlinear waves in hyperbolic metamaterials: focus on solitons and rogues
Nonlinear waves in hyperbolic metamaterials: focus on solitons and rogues Open
The investigation of hyperbolic metamaterials, shows that metal layers that are part of graphene structures, and also types I and II layered systems, are readily controlled. Since graphene is a nicely conducting sheet it can be easily mana…
View article: Simulations of the Electron Spectrum of Quantum Wires in &lt;i&gt;n&lt;/i&gt;-Si of Arbitrarily Doping Profile by Thomas-Fermi Method
Simulations of the Electron Spectrum of Quantum Wires in <i>n</i>-Si of Arbitrarily Doping Profile by Thomas-Fermi Method Open
Electron spectrum in doped n-Si quantum wires is calculated by the Thomas-Fermi (TF) method under finite temperatures. The many-body exchange corrections are taken into account. The doping profile is arbitrary. At the first stage, the elec…
View article: A Novel Displacement-amplifying Compliant Mechanism Implemented on a Modified Capacitive Accelerometer
A Novel Displacement-amplifying Compliant Mechanism Implemented on a Modified Capacitive Accelerometer Open
The micro-accelerometers are devices used to measure acceleration. They are implemented in applications such as tilt-control in spacecraft, inertial navigation, oil exploration, etc. These applications require high operating frequency and …
View article: Waves in hyperbolic and double negative metamaterials including rogues and solitons
Waves in hyperbolic and double negative metamaterials including rogues and solitons Open
The topics here deal with some current progress in electromagnetic wave propagation in a family of substances known as metamaterials. To begin with, it is discussed how a pulse can develop a leading edge that steepens and it is emphasised …
View article: Nonlinear Terahertz Electromagnetic Waves in SrTiO&lt;sub&gt;3&lt;/sub&gt; Crystals under Focusing
Nonlinear Terahertz Electromagnetic Waves in SrTiO<sub>3</sub> Crystals under Focusing Open
The nonlinear waves of terahertz (THz) range are investigated in the paraelectric crystals SrTiO3 at the temperatures ~77 K. The frequency dispersion is important there. In the absence of a bias electric field the dominating nonlinearity i…
View article: Collapse of Nonlinear Dust Sound Pulses in Cylindrical Dusty Plasma Waveguides
Collapse of Nonlinear Dust Sound Pulses in Cylindrical Dusty Plasma Waveguides Open
Nonlinear monopulses of dust sound waves in cylindrical dusty plasma waveguides bounded by a dielectric are investigated. The dusty plasma includes the positive ions as a light component and the negative dust as a heavy one. The dusty plas…
View article: Comparison of Excitation of Acoustic-Electromagnetic Wave in Piezoelecric Crystal and Crystal with Potential of Deformation
Comparison of Excitation of Acoustic-Electromagnetic Wave in Piezoelecric Crystal and Crystal with Potential of Deformation Open
In this article, the comparison of excitation in high frequencies of acoustic-electromagnetic wave in piezoelecric crystal and crystal with potential of deformation GaAs is investigating. Possible mechanisms of coupling different hybrid wa…
View article: Thomas-Fermi method for computing the electron spectrum and wave functions of highly doped quantum wires in n-Si
Thomas-Fermi method for computing the electron spectrum and wave functions of highly doped quantum wires in n-Si Open
The application of the Thomas-Fermi method to calculate the electron spectrum in quantum wells formed by highly doped n-Si quantum wires is presented under finite temperatures where the many-body effects, like exchange, are taken into acco…