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Small-Scale Irregularities Within Polarization Jet/SAID During Geomagnetic Activity
Geophysical Research Letters. 2022. Vol. 49. No. 8. Article e2021GL097107.
A. A. Sinevich, A. A. Chernyshov, Chugunin D. V., Oinats A. V., Clausen L. B., Miloch W. J., Nishitani N., Mogilevsky M. M.
We study the spatial structure of a polarization jet/Sub-Auroral Ion Drift (PJ/SAID) based on data from the NorSat-1 and Swarm satellites during a geomagnetic storm. Observations of plasma parameters inside the PJ/SAID are obtained with NorSat-1 using a system of Langmuir probes with a nominal sampling rate of up to 1 kHz, which allowed measurements with such a high temporal resolution for the first time. A comparative analysis of plasma parameters and electron density spectra inside PJ according to the data from both satellites is presented. Our results show that fluctuations of plasma parameters inside the PJ increase at all scales with increasing geomagnetic activity. Small-scale irregularities in the PJ are measured in situ down to hundreds of meters. The role of large-scale effects in the PJ increases in comparison with the small-scale ones during high geomagnetic activity. The PJ consists of structures ∼0.2° latitude in size within which small-scale irregularities are present.
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
Батова О. Н., Савинецкая Л. Е., Проявка С. В. et al., Nature Conservation Research. Заповедная наука 2026 Т. 11 № 4 С. 25–39
Spermophilus suslicus is a threatened species listed in Red Data Books at all levels (from regional Red Data
Books to the IUCN Red List of Threatened Species), and it currently requires special conservation activity.
Over the past 30–50 years, its range has changed from continuous to mosaic, and its population has declined
everywhere. In 2015, in Russia experimental ...
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
Ari G., Liu X., Jiang L. et al., Ecological Indicators 2026 Vol. 191 Article 115592
Snow drought has become a research hotspot due to its widespread impacts on ecosystems and water resources, yet its effects on vegetation phenology remain relatively understudied. Focusing on the Mongolian Plateau, this study used the Snow Water Equivalent Index and the start of growing season (SOS) to assess the associations between snow drought and vegetation ...
Added: October 12, 2026
Chernyshov A., Klimenko M. V., Nosikov I. A. et al., Advances in Space Research 2026 Vol. 76 No. 12 P. 7325–7350
This study provides a detailed analysis of the impact of the magnetic storm (referred to as the Victory Day Storm, as the solar flares occurred on May 8–9, 2024), which took place from May 10 to 12, 2024, and has become the most significant geomagnetic event of the 21st century to date, on the subauroral and mid-latitude ...
Added: May 19, 2025
Kotova D. S., Sinevich A., Chernyshov A. et al., Scientific Reports 2025 Vol. 15 No. 3458
In the subauroral zone at the boundary of the auroral oval in the evening and night hours during geomagnetic disturbances, a narrow (about 1°–2°) and extended structure (several hours in longitude) is formed. It is known as a polarization jet (PJ) or the subauroral ion drift (SAID). The PJ/SAID is a fast westward ion drift ...
Added: January 29, 2025
A. A. Sinevich, A. A. Chernyshov, Chugunin D. V. et al., JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2024 Vol. 129 No. 11 Article e2024JA033222
In this study, we employ a unique multi‐instrumental approach for a comprehensive examination of Polarization Jet (PJ) (or, another name, Subauroral Ion Drift (SAID)). A diverse set of data is used to assess the connection between the appearance of the inhomogeneous structure of PJ/SAID and its reflection in groundbased observations during geomagnetic activity. Our approach ...
Added: January 29, 2025
Sinevich A., Chernyshov A., Чугунин Д. В. et al., Известия РАН. Серия физическая 2024 Т. 88 № 3 С. 438–444
Results are presented from a study of the internal small-scale structure of the polarization jet/SAID using data from different satellites. The minimum size of irregularities and the typical internal composition of a stratified subauroral ion drift (SSAID) are confirmed. A two-peak structure is found that contains two large strata of the polarization jet/SAID. A shift ...
Added: January 29, 2025
Sinevich A., Chernyshov A., Чугунин Д. В. et al., Геомагнетизм и аэрономия 2023 Т. 63 № 6 С. 764–774
The results of a study of the small-scale internal structure of a polarization jet/SAID (Subauroral Ion Drift) based on satellite data using the wavelet transform of ionospheric plasma parameters are presented. The minimum sizes of small-scale temperature and electron density irregularities are determined. Most likely, any polarization jet/SAID is stratified, as follows from the sample ...
Added: January 29, 2025
Sinevich A., Chernyshov A., Чугунин Д. В. et al., Космические исследования 2021 Т. 59 № 6 С. 489–497
In this work, we study the spatial structure of the polarization jet based on data from the NorSat-1 and Swarm ionospheric satellites during a geomagnetic storm. A comparative analysis of the electron density and temperature dependence on the invariant latitude is carried out simultaneously according to measurements of the NorSat-1 and Swarm C satellites during ...
Added: January 29, 2025
Sinevich A., Chernyshov A., Чугунин Д. В. et al., Солнечно-земная физика 2021 Т. 7 № 1 С. 21–33
In this work, we study the small-scale structure of a polarization jet in the subauroral region during the April 20, 2018 geomagnetic storm. We report measurement results of plasma parameters inside the polarization jet with a maximum sampling rate of up to 1 kHz, obtained with Langmuir probes installed on the NorSat-1 microsatellite. The study ...
Added: January 28, 2025
A. A. Sinevich, A. A. Chernyshov, Chugunin D. V. et al., JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2023 Vol. 128 No. 3 Article e2022JA031109
In this paper, the internal structuring of Polarization Jet (PJ)/Subauroral Ion Drift (SAID) is
studied. It is shown that PJ/SAID consists of several Polarization Jet Strata (PJS) of electron density and
temperature. A new type of phenomena has been discovered called Stratified Subauroral Ion Drift (SSAID),
which is a PJ/SAID containing small-scale PJS. Internal small-scale structure of SSAIDs ...
Added: June 20, 2023
Shustov P., Nishimura Y., Artemyev A. et al., Journal of Atmospheric and Solar-Terrestrial Physics 2020 Vol. 208 P. 105365
The magnetotail dipolarization during substorms is a mesoscale dynamical phenomenon, well documented by in-situ spacecraft observations, numerical simulations, and ground-based optical measurements. The magnetic energy release during substorms results in significant plasma heating and the formation of strong temperature and density gradients behind the dipolarization front. Such gradients are the source of many plasma instabilities ...
Added: December 12, 2020