Kinetic Description of a Whistler Wave Propagating in Plasma Along the Magnetic Field

?

Kinetic Description of a Whistler Wave Propagating in Plasma Along the Magnetic Field

Plasma Physics Reports. 2022. Vol. 48. P. 754–767.

Resonant wave-particle interaction represents one of the most important phenomena that determines
spectra of waves and dynamics of high-energy particles in space plasma. This interaction was studied
most comprehensively for the case in which, with high degree of accuracy, plasma can be divided into two
components: a cold component that determines dispersion properties of waves but does not participate in resonance
interaction and a high-energy component characterized by low density relative to that of the hot component,
so that it has no impact on wave dispersion. On the contrary, high-energy particles participate in resonance
interaction with a wave thereby determining its kinetic collisionless damping (or amplification in the
case of unstable plasma). To calculate the damping or growth rate of the wave, distribution function of highenergy
particles is usually assumed to be specified analytically. It is also assumed that the damping or growth
rate is much smaller than the wave frequency. In the present work, we develop an approach to analysis of linear
resonance interaction of whistler waves propagating along an external magnetic field with high-energy
electrons that allows lifting limitations mentioned above and finding the real and imaginary parts of frequency
at arbitrary relation between them for a wave with a given wave vector. Moreover, the electron distribution
function that is not divided into cold and high-energy components can be specified numerically, e.g., based
on satellite measurements of differential particles fluxes. The developed approach is illustrated using electron
fluxes measured by Van Allen Probe-A and MMS satellites as examples.

Research target: Physics

Language: English

DOI

Room temperature microlasers based on quasi-planar geometry

Kryzhanovskaya N., Makhov I., Dragunova A., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2026 Vol. 19 No. 1.1 P. 98–104

The planar microcavity structure was grown using molecular-beam epitaxy. Single-mode lasing was observed at a wavelength of 960 nm for pillars with a diameter of 15 μm. At 300 K, the lasing threshold was approximately 30 mW. Increasing the pump power to 2.7 times the threshold power resulted in a mode energy shift of approximately 1 meV. This shift ...

Added: September 23, 2026

Plasma excitations in thin-film NbN probed by terahertz spectroscopy

Andreeva S., Gavrilov A. A., Dzhikirba K. R. et al., Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 114 Article 134515

We examine plasma excitations with linear dispersion in a system of superconducting electrons in thin NbN disks. Using frequency-domain terahertz spectroscopy, we study the evolution of plasmons up to critical temperature Tc. The observed excitations tend to shift to the lower frequencies while temperature is increasing and the spectral features vanish at T > Tc. We study the ...

Added: September 23, 2026

Thermo-optically tuned single-mode limaçon microlaser on quantum-dots

Образцова А. А., Ivanov K., Moiseev E. et al., Journal of Physics D: Applied Physics 2026 Vol. 59 No. 30 P. 305103

We demonstrate a thermo-optically tunable microlaser based on an InGaAs/GaAs quantum-dot (QD) active region employing a deformed limaçon-shaped cavity. The asymmetric geometry effectively lifts the degeneracy of high-Q whispering-gallery modes, enabling single-mode lasing. A side-mode suppression ratio exceeds 25 dB over a wide current range. Under continuous-wave electrical pumping, the device achieves a peak output power ...

Added: September 23, 2026

Exact screening constraints for theories of inhomogeneous electrolytes: Generalized Stillinger–Lovett relations and a nonlinear Ward hierarchy

Budkov Y., Journal of Chemical Physics 2026 Vol. 165 No. 12 Article 124105

Exact theories of electrolyte structure must satisfy the nonlocal constraints imposed by electrostatic screening, yet these constraints are most commonly formulated only for homogeneous bulk systems and at the level of two-point correlations. Here, we develop a unified field-theoretic framework that extends them to general inhomogeneous ionic fluids and nonlinear charge correlations. Using a standard ...

Added: September 22, 2026

Особенности взаимодействия мощного импульсного лазерного излучения с материалами вакуумной камеры термоядерного реактора

Боровицкая И. В., Пименов В. Н., Коршунов С. Н. et al., Перспективные материалы 2026 № 10 С. 37–54

Проведено сравнение, обобщение и систематизация механизмов эрозии и разрушения поверхности малоактивируемых материалов, перспективных для использования в качестве материалов вакуумной камеры термоядерных реакторов: ванадия, его сплава V – 10 Ti – 6 Cr – 0,05 Zr – 0,1 Si и вольфрама при последовательном воздействии на них ионных и тепловых потоков. Тепловые потоки имитировали с помощью мощного импульсного лазерного излучения (ЛИ), создаваемого ...

Added: September 22, 2026

DOUBLE-RESONANCE RESPONSE OF A SUPERCONDUCTING QUANTUM METAMATERIAL: MANIFESTATION OF NONCLASSICAL STATES OF PHOTONS

Iontsev M.A., Mukhin S. I., Fistul M. V., Physical Review B: Condensed Matter and Materials Physics 2016 Vol. 94 No. 17 P. 174–510

We report a theoretical study of the ac response of superconducting quantum metamaterials (SQMs), i.e., an array of qubits (two-level systems) embedded in a low-dissipative resonator. By making use of a particular example of a SQM, namely the array of charge qubits capacitively coupled to the resonator, we obtain a second-order phase transition between an ...

Added: September 22, 2026

Interaction-limited conductivity of twisted bilayer graphene revealed by giant terahertz photoresistance

Shilov A. L., Elesin L., Kravtsov M. et al., Nature Communications 2026 Vol. 17 No. 1 Article 9734

Identifying the microscopic processes limiting conductivity is essential for understanding correlated quantum materials. In twisted bilayer graphene, metallic resistivity follows ρ ~ Tα with widely varying α, fueling competing interpretations from phonon-limited transport and umklapp scattering to strange metallicity and heavy-fermion renormalization. Here, we use terahertz excitation to selectively heat electrons while keeping the lattice cold, separating ...

Added: September 20, 2026

RL-ABC: Reinforcement learning for accelerator beamline control

Ibrahim A., Derkach D., Kaledin M. et al., Computer Physics Communications 2026 Vol. 329 Article 110407

We present RLABC (Reinforcement Learning for Accelerator Beamline Control), an open-source Python framework that automatically transforms standard Elegant beamline configurations into reinforcement learning environments. RLABC integrates with the widely-used Elegant beam dynamics simulation code via SDDS-based interfaces, enabling researchers to apply modern RL algorithms to beamline optimization with minimal RL-specific development. Validation on a test ...

Added: September 20, 2026

Drift Towards Isotropization during the 3D Hydrodynamic Turbulence Onset

Копьев А., JETP Letters 2026 Vol. 123 No. 5 P. 310–316

The incompressible three-dimensional Euler equations develop very thin pancake-like regions of exponen tially increasing vorticity. The characteristic thickness of such regions decreases exponentially with time, while the other two dimensions do not change considerably, making the flow near each pancake strongly anisotropic. The pancakes emerge in increasing number with time, which may enhance the anisotropy ...

Added: September 18, 2026

Structural properties of cyanobiphenyl nematics doped with gold nanoparticles: The result of MD simulations

Захаров А. В., Düven H., Capar M. I., Physics Letters A 2026 No. 576 Article 131388

Molecular dynamics simulations were carried out to study the structural properties of nematic pentyl cyanobiphenyl (5CB) and pentyloxy cyanobiphenyl (5OCB) liquid crystals (LCs) doped with gold nanoparti cles (GNPs) of different numbers, shapes and sizes. The spherical GNPs of two different radii and rod-like have been doped in 5CB and 5OCB cyanobiphenyl liquid crystals. In order to describe ...

Added: September 17, 2026

The Effect of the Gate Material in MIS Structures on the High-Field Charge Degradation in the Gate Dielectric

Andreev D. V., Kornev S. A., Bondarenko G.G. et al., Inorganic Materials: Applied Research 2026 Vol. 17 No. 5 P. 1226–1230

Comparative studies are carried out to investigate high-field charge degradation effects in the gate dielectric of metal—insulator—semiconductor (MIS) structures with aluminum and polysilicon gates. Charging phenomena in MIS structures are explored using high-field electron injection into the dielectric under conditions of gradually increasing voltage current density, with periodic short-term switching to a measurement mode at a constant low injection ...

Added: September 15, 2026

Vague stimulating ideas, images and metaphors in scientific thinking: researchers' work with horizons of unclear knowledge

Poddiakov A., / Series Social Science Research Network "Social Science Research Network". 2026. No. 7437658.

Clarity of knowledge and reasoning is necessary in many cases. Yet vagueness in scientific thinking related to surprise, curiosity, "ability to engage with not-knowing" (de Freitas) and abductive reasoning is also a crucially important source of scientific creativity which supplements combinatorial logic when dealing with the already known. Starting from studies by C. S. Peirce ...

Added: September 15, 2026

Water confined in heterogeneous clay–quartz pores: Structure and dynamics from atomistic simulations

Glushak A., Tararushkin E., Smirnov G., Colloids and Surfaces A: Physicochemical and Engineering Aspects 2027 Vol. 752 Article 141756

The molecular-scale behavior of water in heterogeneous clay–quartz systems is critical for understanding cementation processes in natural soils and compacted bentonite, which is crucial for oil recovery and nuclear waste disposal barriers construction. Here we investigate how heterogeneity of mixed Na-montmorillonite and α-quartz surfaces affect water structure and dynamics in nanopores of 2.5 to 60 Å ...

Added: September 15, 2026

Some Aspects of Remote State Restoring in State Transfer Governed by XXZ-Hamiltonian

Bochkin G., Doronin S., Fel’dman E. et al., Lobachevskii Journal of Mathematics 2024 Vol. 45 No. 3 P. 1188–1207

We consider the remote state restoring and perfect transfer of the zero-order coherence matrix (PTZ) in a spin system governed by the XXZ-Hamiltonian conserving the excitation number. The restoring tool is represented by several nonzero Larmor frequencies in the Hamiltonian. To simplify the analysis we use two approximating models including either step-wise or pulse-type time-dependence ...

Added: September 14, 2026

Coherence restoring in communication line via controlled interaction with environment

Fel’dman E. B., I. D. Lazarev, Pechen A. N. et al., Quantum Information Processing 2026 Vol. 25 Article 121

We consider the state-restoring protocol based on the controlled interaction of a linear chain with environment through incoherent control by the specially adjusted step-wise time-dependent Lindblad operators. We show that the best restoring result (maximal scale factors in the restored state) corresponds to the symmetrical Lindblad equation. (0, 1)-excitation dynamics is considered numerically, and restoring ...

Added: September 14, 2026

Macroscopic entanglement distribution with atomic ensembles

Li S., Hu J., Ilia D. Lazarev et al., Annals of Physics 2026 Vol. 494 No. 1 Article 170618

The distribution of entanglement is a crucial task for quantum communication towards realizing a globe-spanning quantum internet. Recently, a protocol for deterministic long-distance distribution of macroscopic entanglement over a network of ensembles of qubits was introduced (Pyrkov et al., 2025). It was shown that this protocol allows for the propagation of macroscopic amounts of entanglement ...

Added: September 14, 2026

Quantum Repeater Protocol for Deterministic Distribution of Macroscopic Entanglement, Advanced Quantum Technologies

Pyrkov A., Lazarev I., Byrnes T., Advanced Quantum Technologies 2025 Article 2400524

Distributing long-distance entanglement is a fundamental goal that is necessary for a variety of tasks such as quantum communication, distributed quantum computing, and quantum metrology. Currently quantum repeater schemes typically aim to distribute one ebit at a time, the equivalent of one Bell pair's worth of entanglement. Here, a scheme is presented to distribute a ...

Added: September 14, 2026

Hybrid quantum-classical unsupervised data clustering based on the self-organizing feature map

I. D. Lazarev, Narozniak M., Byrnes T. et al., Physical Review A: Atomic, Molecular, and Optical physics 2025 Vol. 111 No. 012416 Article 012416

Unsupervised machine learning is one of the main techniques employed in artificial intelligence. We introduce an algorithm for quantum-assisted unsupervised data clustering using the self-organizing feature map, a type of artificial neural network. The complexity of our algorithm scales as 𝑂⁡(𝐿⁢𝑁), in comparison to the classical case which scales as 𝑂⁡(𝐿⁢𝑀⁢𝑁), where 𝑁 is the ...

Added: September 14, 2026

Mixing of real and quantum gases

Борщевский А. Я., Physical Chemistry Chemical Physics 2025 Vol. 27 No. 9 P. 4793–4803

Through the consistent application of quantum statistical thermodynamics, functions of isothermal mixing of real rarefied gases and quantum gases in states of varying degrees of degeneracy are obtained. The reasons for the emergence and resolution of the “Gibbs paradox” and other “paradoxes” are analyzed. Numerical calculations of entropy and pressure jumps were performed using the ...

Added: September 14, 2026

Hectometric Continuum Radiation Observations on Different Temporal Scales in Near-Earth Space

D. A. Dorofeev, A. A. Chernyshov, Mogilevsky M. M. et al., JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2025 Vol. 130 Article e2025JA033900

This study analyzes data from the ERG (Arase) satellite over a period of nearly 7 years (2017–2023). During this time, about 1,000 cases of hectometric continuum (HMC) radiation in near‐Earth space were detected, which made it possible to identify characteristic features on different time scales. On a daily scale, it was established that HMC is ...

Added: August 31, 2026

An Investigation of the Effect of Intermittency on the Turbulent Field on Particle Acceleration in the Plasma Sheet of the Earth’s Magnetotail

Levashov N. N., V. Yu. Popov, Malova H. V. et al., Cosmic Research 2025 Vol. 63 No. 2 P. 164–169

Using a numerical model, the influence of intermittency on the acceleration of particles in the equatorial plane of the Earth’s magnetotail was studied. For comparison with observational data, we selected the event of July 17, 2001, when plasma flows with velocities of up to 400 km/s and an amplitude of the turbulent magnetic field of ...

Added: September 4, 2025

On the Role of Kinetic Alfven Waves in the Magnetosheath Ion Thermalization Around the Night-Side Magnetopause

Lukin A., Artemyev A. V., Zhang X. -. et al., JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2023 Vol. 128 No. 5 Article e2023JA031452

The solar wind ion transport across the magnetopause is one of the main sources of plasma for the Earth's magnetotail. Such a transport is supported by various dynamic processes at the flank magnetopause, where wave-particle interactions play a crucial role in ion flow thermalization and diffusion across magnetic field surfaces of the magnetopause tangential discontinuity. ...

Added: May 21, 2023

A Comparative Analysis of Quasi-Periodic Processes in the Magnetospheric Current Sheet and the Current Sheets of the Solar Corona

Zimovets I., Lukin A., Artemyev A., Cosmic Research 2022 Vol. 60 No. 6 P. 420–436

Reconnection of magnetic lines of force represents a universal process of releasing the stored energy of the magnetic field and its transformation into the thermal energy of plasma and the energy of accelerated charged particles. The initialization and proceeding of the magnetic reconnection process are essentially related with the dynamics of a spatially localized region ...

Added: October 19, 2022

Evolution of Thermal Electron Distributions in the Magnetotail: Convective Heating and Scattering-Induced Losses

Shustov P., Lukin A., Zhang X. -. et al., JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2021 Vol. 126 No. 12 Article e2021JA029952

Earth's magnetotail is filled with solar wind and ionospheric electrons, whose initial energies are significantly lower than the typical energies (temperatures) of plasmasheet electrons. One of the most common mechanisms responsible for heating of solar wind and ionospheric electrons in Earth's magnetotail is adiabatic heating caused by earthward convection of these electrons from the deep ...

Added: June 9, 2022