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Simulation of a Multifractal Turbulent Electromagnetic Field in Cosmic Plasma
Cosmic Research, USA. 2023. Vol. 61. No. 2. P. 113–119.
A two-dimensional model of a multifractal turbulent electromagnetic field is proposed that allows flexibly varying the width of the multifractal spectrum and the level of intermittency. The electromagnetic field is modeled using a superposition of wavelets that are distributed uniformly throughout the computational domain. By means of a special distribution of amplitudes, we ensure that the resulting field is multifractal and intermittent. This model was used to study the effect of multifractality and intermittency on the acceleration of charged particles in a turbulent field in the Earth’s magnetotail. It was shown that, in the case of a multifractal field, individual particles are able to achieve higher energy values in comparison with monofractal turbulence.
Language:
English
Flamarion M. V., Pelinovsky E., Nonlinear Dynamics 2026 Vol. 114 Article 784
In this article, we investigate wave packet and solitary wave dynamics in the Whitham–Ostrovsky (WO) equation. By means of a multiple-scales expansion, we formally derive a nonlinear Schrödinger (NLS) equation governing the envelope evolution.The corresponding modulational stability diagram is then obtained using the Lighthill criterion. We show that sufficiently large values of the low-frequency dispersive term render ...
Added: June 5, 2026
Medvedev T. V., Pochinka O., Chaos 2026 Vol. 36 No. 6 Article 063107
We consider 3-diffeomorphisms with source–sink dynamics where Smale solenoids play the role of the source and the sink (NSSS-diffeomorphisms). It is known that such diffeomorphisms exist only on lens spaces. On the 3-sphere, every NSSS-diffeomorphism is associated with an exchangeable braid. An exchangeable braid with the strand number n was constructed for each n 3 in such a way ...
Added: June 4, 2026
Seul: PMLR, 2026.
Added: June 4, 2026
Kazakov A., Shilov O. M., Mints D. et al., Chaos 2026 Vol. 36 No. 6 Article 063112
We study hyperbolic chaotic dynamics for maps of a two-dimensional torus. We introduce a two-parameter family of diffeomorphisms which, as we show, demonstrates all types of hyperbolic chaotic dynamics that can appear in the two-dimensional case. In addition, we describe all the bifurcations responsible for the transitions between these chaotic regimes. ...
Added: June 4, 2026
Hazarika A. P., Das A., Das S. K. et al., Physica B: Condensed Matter 2026 Vol. 738 Article 418803
Lemon grass (Cymbopogon citratus, LG-SiO2), horsetail (Equisetum debile, SG-SiO2), and cassava leaves (Manihot esculenta, CL-SiO2) were used to green-synthesize silica (SiO2) nanoparticles (NPs). While LG-SiO2 and SG-SiO2 had strong (101) peaks and a large 22° amorphous peak, XRD of CL-SiO2 verified crystallinity. LG-SiO2 (agglomerated porous), SG-SiO2 (rectangular-cube agglomerates), and CL-SiO2 (flake agglomerates) had different morphologies. The TEM image of LG-SiO2 revealed agglomerated ...
Added: June 4, 2026
Nozdrinova E., Pochinka O., Shmukler V., Математический сборник 2026 Т. 217 № 6 С. 71–89
Гомеоморфизмы топологических пространств называются эквивалентными по надстройке, если надстройки над ними топологически эквивалентны. В частности, топологически сопряженные гомеоморфизмы эквивалентны по надстройке. Известно, что для гомологически неприводимых гомеоморфизмов их топологическая сопряженность является необходимым и достаточным условием их эквивалентности по надстройке. Тогда как инварианты топологической сопряженности гомологически приводимых гомеоморфизмов во многих случаях являются избыточными для эквивалентности по ...
Added: June 3, 2026
Kornbleuth M., Opher M., Drake J. F. et al., Astrophysical Journal 2026 Vol. 1004 No. 1 Article 1
The shape of the heliosphere, regarded as comet-like since the 1960s, has recently been the subject of intense debate in the last decade. There is disagreement as to whether the heliospheric tail extends to ∼10,000 au in a comet-like shape or if it is short (∼400 au) with a split. Energetic neutral atom (ENA) maps from ...
Added: June 3, 2026
Kartsev A., Nishant T., Saswata G. et al., Journal of Materials Chemistry C 2026 Article -
Overheating remains a critical limitation in high-performance electronic and computing systems,
necessitating the development of efficient thermal management fluids. In this work, a magnetically
responsive hybrid ferrofluid was developed by incorporating two-dimensional hexagonal boron nitride
(2D-hBN) nanosheets into a Mn–Zn–ferrite-based ferrofluid. The hybrid system retains magnetic
responsiveness while leveraging the high in-plane thermal conductivity and chemical stability of 2D-hBN
nanosheets. ...
Added: June 2, 2026
Fortuna A. S., A.I. Kartsev, Gorshenkov M. V. et al., Journal of Alloys and Compounds 2026 Vol. 1070 Article 188711
The τ-phase in Mn-Al-Ga alloys is a promising candidate for rare-earth-free permanent magnets. This study re-veals that the τ(γ₂)-phase in rapidly quenched Mn55Al36Ga9 ribbons contains a high density of dislocations, which
form antiphase boundaries (APBs). Using transmission electron microscopy and density functional theory, we
demonstrate that Mn atoms at these APBs couple antiferromagnetically. This antiferromagnetic interaction is
identified ...
Added: June 2, 2026
Gnetov F., Konakov V., Успехи математических наук 2026 Т. 81 № 3 (489) С. 161–162
Пусть M обозначает симметрическое пространство некомпактного типа ранга 1. Опираясь на фундаментальную работу [1], в [2] было показано, что плотность соответствующим образом нормированной суммы независимых Hn-значных случайных величин, определенная через сложение Мёбиуса в модели шара Пуанкаре, сходится к фундаментальному решению соответствующего уравнения теплопроводности. Пределом являлся нормальный закон на Hn, соответствующий ядру теплопроводности, определяемому оператором Лапласа–Бельтрами. ...
Added: June 2, 2026
Silakov D., Системный администратор 2026 № 3 С. 28–33
В статье про платформы для разработки открытого ПО в Китае мы рассказали про GitCode – молодой проект, позиционируемый как площадка для разработчиков со всего мира. Сейчас на GitCode размещаются проекты, созданные в КНР, но некоторые из них уже известны и на международной арене. Помочь открытым проектам в становлении, развитии и расширению аудитории призван фонд OpenAtom ...
Added: June 2, 2026
Dikhtievskaya K., Argunov E., Карцев А. И. et al., The Journal of Physical Chemistry Letters 2026 Vol. 17 No. 17 P. 4999–5004
In this study we revealed the effect of scandium doping on the electronic and superconducting properties of the MgB2 compound. Calculations demonstrate that Sc substitutes for Mg atoms, acting as an electron donor. Mg substitution diminishes the density of states in the σ-band and attenuates the electron–phonon coupling, thereby elucidating the reduction in critical temperature. Simultaneously, ...
Added: June 2, 2026
Duran E. ., Pulgar A., Izquierdo R. et al., Physica Status Solidi (A) Applications and Materials 2026 Vol. 223 No. 7 Article e202500942
Ceramic superconductors exhibit remarkable properties, including zero electrical resistance and potent magnetic behavior, operating at temperatures as high as the boiling points of liquid nitrogen (77 K) and liquid hydrogen (20 K). These characteristics position them as key enablers for sustainable technologies spanning electric propulsion, lossless energy transmission, advanced medical imaging, and quantum computation. This review presents ...
Added: June 1, 2026
Viktor A. Frantsuzov, Artemyev A., Shi X. et al., Astrophysical Journal 2024 Vol. 963 No. 1 Article 16
The investigation of mechanisms responsible for the heating of cold solar wind electrons around the Earth’s bow shock is an important problem in heliospheric plasma physics because such heating is vitally required to run the shock drift acceleration at the bow shock. The prospective mechanism for electron heating is magnetic pumping, which considers electron adiabatic ...
Added: April 25, 2025
Viktor A. Frantsuzov, Artemyev A., Zhang X. et al., Journal of Plasma Physics 2023 Vol. 89 No. 1 Article 905890101
Electron resonant interactions with electromagnetic whistler-mode waves play an important role in electron flux dynamics in various space plasma systems: planetary radiation belts, bow shocks, solar wind and magnetic reconnection regions. Two key wave characteristics determining the regime of wave–particle interactions are the wave intensity and the wave coherency. The classical quasi-linear diffusion approach describes ...
Added: April 25, 2025
Artekha N., Shklyar D., Физика плазмы 2022 Т. 48 С. 613–627
Резонансное взаимодействие волн и частиц -- одно из важнейших явлений, определяющих спектры волн и динамику энергичных частиц космической плазмы. Это взаимодействие наиболее полно исследовано для случая, когда плазму можно с хорошей точностью разделить на две компоненты: холодную компоненту, определяющую дисперсионные свойства волн и не участвующую в резонансном взаимодействии, и энергичную компоненту, плотность которой мала по сравнению с плотностью холодной ...
Added: May 17, 2023
P. A. Bespalov, O. N. Savina, G. M. Neshchetkin et al., Results in Physics 2023 Vol. 46 Article 106291
Some results of observations on board the Van Allen probe A spacecraft of atypical quasi-periodic VLF
electromagnetic emissions inside the plasmasphere are discussed. We study in detail two events (December
6, 2015 and November 24, 2015) of the generation of deeply modulated quasi-periodic VLF emissions (QP)
in the frequency band below 2 kHz, when separate relatively short (on ...
Added: February 18, 2023
Zaitsev V. V., V. E. Shaposhnikov, Monthly Notices of the Royal Astronomical Society 2022 Vol. 513 No. 3 P. 4082–4089
On the example of the hot Jupiter HD 189733b, in whose magnetosphere the conditions for the ’operation’ of an electron–cyclotron maser are not fulfilled, an analysis of the plasma mechanism of radio emission generation is carried out. The purpose of the analysis is to highlight the range of parameters at which the realization of a ...
Added: January 26, 2023
P.A.Bespalov, O.N. Savina, G.M. Neshchetkin, Results in Physics 2022 Vol. 35 Article 105295
We study typical very low-frequency magnetospheric chorus electromagnetic emissions recorded by the Van
Allen probe in their excitation region. The Hausdorf dimension of chorus is determined by means of a numerical
calculation based on experimental data of the burst mode that provides high time resolution samples. Some
cases of halving and jumping of the dimension value for appropriate ...
Added: June 13, 2022
Левашов Н. Н., Попов В.Ю., Малова Х. В. et al., Космические исследования 2022 Т. 60 № 1 С. 11–16
В статье представлен результат численного эксперимента по ускорению заряженных частиц в турбулентном поле с различными уровнями перемежаемости. Главной задачей было исследование влияния перемежаемости на ускорение частиц в турбулентной космической плазме. Для этого была разработана трехмерная модель турбулентного поля с контролируемым уровнем перемежаемости. Перемежаемое электромагнитное поле моделируется как суперпозиция турбулентного электромагнитного поля со степенным спектром, полученного ...
Added: May 1, 2022
Вайсберг О. Л., Шестаков А. Ю., Шувалов С. Д. et al., Известия высших учебных заведений. Приборостроение 2018 Т. 61 № 5 С. 398–402
A brief review of methods of diagnostics and monitoring of space weather in the Earth's magneto
sphere, and the diagnostic instruments currently in use,is presented. The large scale of the magnetosphere,
the presence of several mutually related regions and processes, the variability of the structural variations are
shown to necessitate monitoring of these magnetospheric regions simultaneously or with ...
Added: December 19, 2018
Зеленый Л. М., Григоренко Е. Е., Малова Х. В. et al., Письма в Журнал экспериментальной и теоретической физики 2018 Т. 108 № 8 С. 586–599
The article presents observations of current configurations with a magnetic shear in the tail of a magnetic
the Earth’s sphere by the satellite quartet Cluster, and in the solar wind by the Wind satellite. Shown
that in current configurations with magnetic shear the following structural features are observed:
1) current layer thickening; 2) plasma density distribution, asymmetrical relative ...
Added: November 29, 2018
Novikov L., Makletsov A. A., Sinolits V. V., IEEE Transactions on Plasma Science 2017 Vol. 45 No. 8 P. 1919–1922
Influence of electric field of charged spacecraft on secondary emission currents on the spacecraft surface is analyzed in terms of computation of secondary electron trajectories. Dependencies of the recollected electrons number on the electric field intensity at various distances from the emission point for standard secondary electron spectra are calculated. Criteria of the secondary electron ...
Added: January 24, 2018