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Plasma maser in the plasmasphere of HD 189733b
Monthly Notices of the Royal Astronomical Society. 2022. Vol. 513. No. 3. P. 4082–4089.
Zaitsev V. V., V. E. Shaposhnikov
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 plasma maser is possible, as well as to determine the frequency range of generated radio emission. The conditions under which the plasma maser is efficient enough to generate radiation with the intensity accessible for observation by the existing radio telescopes are also defined.
Dmitriev A., Kornilov V., Batienkov R., Lecture Notes in Civil Engineering 2026 Vol. 886 P. 249–255
Numerous studies have provided compelling evidence that the probability distribution of avalanche sizes follows a power law, and that 1/f noise is present in the stochastic dynamics of landslides. We present a theoretical explanation of these phenomena within the framework of self-organized criticality theory, proposing a discrete-time model in the form of a sandpile cellular ...
Added: October 13, 2026
Dmitriev A., Shulman I., Lebedev A., Studies in Computational Intelligence 2026 Vol. 1265 P. 266–273
A discrete-time model is presented for the self-organization of the X/Twitter social network to the edge of a phase transition, characterized by avalanche-like propagation of information in the network. The model is based on the analogy between the critical dynamics of the X social network and sandpile cellular automata with Manna rule on the Chung-Lu ...
Added: October 13, 2026
Arutyunov K., Kharitonov I. A., Petrosyants K. O., JETP Letters 2026 Vol. 124 No. 6 P. 1–16
Superconducting properties of metallic micro- and nanowires can be entirely different from those of bulk superconductors. Of particular interest is the nonequilibrium current-induced state of a quasi-one-dimensional superconducting channel. The most interesting phenomenon here is the stepped I–V characteristic, explained by a process known as phase slip center activation. If the origin of such step-like ...
Added: October 13, 2026
Makarov D. M., Kalikin N., Fashchevsky K. A. et al., Electrochimica Acta 2026 Vol. 579 Article 150159
Machine learning (ML) has become a powerful tool for accelerating the development of carbon-based supercapacitors;
however, most published models assume that a single predictive framework can describe both conventional
porous carbons and hybrid carbon electrodes. Here, we test this assumption using a comprehensive
benchmark dataset and an extended literature-curated dataset enriched with synthesis- and electrolyte-related
descriptors. Three ML algorithms ...
Added: October 13, 2026
Махлуф М., Ozhegov R., Elezov M. et al., Фотоника 2026 Vol. 20 No. 6 P. 414–423
This paper compares the ranging precision of direct time-of-flight (dToF) and non-line-of-sight (NLOS) LiDAR architectures, both using a superconducting nanowire single-photon detector (SNSPD). Both systems operate at 1550 nm with a 50 ps pulsed laser and time-correlated single-photon counting (TCSPC). The dToF configuration achieved approximately 100 µm precision at 10 m, while the NLOS configuration achieved 500 µm precision for ...
Added: October 12, 2026
Singapore: Springer, 2026.
This volume presents the Proceedings of the 34th IUPAP Conference on Computational Physics (CCP2023), held in Kobe, Japan on August 4–8, 2023. It offers a collection of peer-reviewed articles that highlight recent developments in computational and simulation research across various areas of physics. Key topics include the use of data science, quantum computing, and machine ...
Added: October 12, 2026
Goncharov A., Chibisov A., Advanced Theory and Simulations 2023 Vol. 12 No. 13 Article 2200816
Designing stable quantum computers with the ability to correct errors responsibly requires a detailed understanding of the physical processes that underlie these devices. In this study, detailed quantum mechanical simulations of the atomic structure, charge distribution of electron density, and distribution and orientation of magnetic and quantum states as a function of applied external pressure ...
Added: October 11, 2026
Chibisov A., Gnidenko A., Chibisova M. et al., FlatChem 2023 Vol. 41 Article 100533
Manufacturing precise quantum computers with small errors in quantum operations, long coherence times, and low power consumption is the most important challenge in modern nanoelectronics. To understand the operating modes of such calculators in detail, both the optimal arrangement of the qubit system within the structure and changes in its magnetic properties must be comprehensively ...
Added: October 11, 2026
Ruderman M. S., N. S. Petrukhin, Monthly Notices of the Royal Astronomical Society 2026 Vol. 549 No. 4 Article stag783
For the first time we study kink oscillations of braided coronal magnetic loops. We use the simplest model of a braided loop that consists just of two identical curved magnetic tubes. It is assumed that the plasma density is constant inside the tubes, and also in the surrounding plasma. To describe the kink oscillations we ...
Added: July 12, 2026
Козырева В. С., Богомазов А. И., Демков Б. П. et al., Астрономический журнал 2023 Т. 100 № 5 С. 441–451
В работе изучается световое уравнение затменной двойной системы FL Lyr по данным космических телескопов Kepler и TESS. Показано, что в системе есть кандидат в экзоюпитеры FL Lyr b с вероятным значением орбитального периода около 22 лет. ...
Added: March 5, 2026
Ruderman M. S., N. S. Petrukhin, Kataeva L. Y., Monthly Notices of the Royal Astronomical Society 2025 Vol. 542 No. 2 P. 1076–1087
We study standing non-linear sausage waves in coronal loops with the plasma temperature varying with time. In our analysis we use the simplest model of a coronal loop in the form of a straight magnetic tube with a circular cross-section. We also assume that the plasma-beta is low. This enables us to neglect the magnetic ...
Added: August 21, 2025
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
Zaitsev V. V., Shaposhnikov V., Kuznetsov A. A. et al., Geomagnetism and Aeronomy 2024 Vol. 64 No. 7 P. 1014–1020
Abstract—In analogy with the acceleration mechanism implemented in the Jupiter–Io system, the electron
acceleration mechanism is discussed with the example of the plasmasphere of exoplanet HD 189733b. Under
conditions when the oncoming stellar wind flow with the stellar magnetic field included in it reaches a region
of the atmosphere with a sufficient number of neutral particles, the different ...
Added: March 11, 2025
Зайцев В. В., Shaposhnikov V., Ходаченко М. Л. et al., Письма в Астрономический журнал 2024 Т. 50 № 1 С. 100–109
We present the results of our study of the influence of stellar activity on the efficiency of the plasma radio emission generation mechanism and the properties of this emission in the atmospheres of exoplanets with a weak magnetic field. The plasma generation mechanism can be efficiently realized in the case where the Langmuir frequency exceeds ...
Added: March 11, 2025
Struminsky A. B., Sadovski A. M., Zharikova M.S., Geomagnetism and Aeronomy 2018 Vol. 58 No. 8 P. 1108–1112
Stellar and galactic cosmic rays (SCR and GCR) are the primary factors influencing the radiation conditions near exoplanets. The GCR spectrum and its time variations are shaped by modulation processes in the astrosphere (the parameters of stellar wind and the local interstellar medium). The estimation of the velocity and density of hot stellar wind in ...
Added: June 20, 2024
Zaitsev V. V., Shaposhnikov V., Khadachenko M. L. et al., Geomagnetism and Aeronomy 2023 Vol. 63 No. 7 P. 892–898
On exoplanets with a weak magnetic field, the so-called plasma maser can be effectively implemented
instead of an electron cyclotron maser. This maser involves the generation of plasma waves by energetic
electrons and their conversion into radio emissions at the plasma frequency or at the double frequency.
Under specific conditions, a maser effect occurs at the plasma frequency, ...
Added: February 20, 2024
Levashov N. N., Popov V., Malova H. V. et al., 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 ...
Added: September 1, 2023
Ruderman M. S., N. S. Petrukhin, Monthly Notices of the Royal Astronomical Society 2023 Vol. 523 No. 2 P. 2074–2082
We study oscillations of two parallel interacting magnetic tubes in the presence of plasma flow along the tubes. Using the cold plasma and thin tube approximations we derive the system of two equations describing these oscillations. This system of equations is valid for equilibria where the plasma density and flow velocity can vary along the ...
Added: July 26, 2023
Valyavin G., Beskin G., Valeev A. et al., Astrophysical Bulletin 2022 Vol. 77 No. 4 P. 495–508
We present a brief description of a joint Russian-Korean project abbreviated as EXPLANATION (EXoPLANet And Transient events InvestigatiON). The project is aimed at a massive photometric, speckle-interferometric, spectral, and radio bolometric search for non-stationary events in the Universe, as well as the study of exoplanets. The core of the project consists of several 0.07–2.5-m optical ...
Added: June 26, 2023
Valyavin G., Beskin G., Valeev A. et al., Photonics 2022 Vol. 9 No. 12 Article 950
Over the past decades, the achievements in astronomical instrumentation have given rise to a number of novel advanced studies related to the analysis of large arrays of observational data. One of the most famous of these studies is a study of transient events in the near and far space and a search for exoplanets. The ...
Added: June 26, 2023
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
Abolmasov P., Biryukov A., Monthly Notices of the Royal Astronomical Society 2020 Vol. 496 No. 1 P. 13–18
Magnetic fields of strongly magnetized stars can trap conducting matter due to frozen-in condition. In the force-free regime, the motion of the matter along the field lines may be considered in the 'bead on a wire' approximation. Such a motion, if gravity and centrifugal forces are taken into account, has equilibrium points, some of which ...
Added: October 31, 2022