Article
Astronomy & Astrophysics
Mark J. Kuiack, Ralph A. M. J. Wijers, Aleksandar Shulevski, Antonia Rowlinson
Summary: The study reports the discovery of bright, fast, radio flashes near Earth caused by plasma in the ionosphere, occurring either in isolation or large clusters in the densest parts of the ionosphere. Distinguishing these events from genuine astrophysical transients is crucial for future surveys searching for low frequency radio transients.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Physics, Fluids & Plasmas
Vadim Roytershteyn, Gian Luca Delzanno
Summary: Kinetic simulations and theory show that whistler waves can excite oblique, short-wavelength fluctuations through secondary drift instabilities in the presence of a sufficiently cold plasma population. The excited modes lead to heating of the cold populations and damping of the primary whistler waves. The threshold for instability depends on the density and temperature of the cold population, with a relatively small threshold if the cold population's temperature is low enough. This mechanism may play a significant role in controlling the amplitude of whistlers in regions of the Earth's magnetosphere with cold background plasma of sufficient density.
PHYSICS OF PLASMAS
(2021)
Article
Chemistry, Physical
Trey Oldham, Shurik Yatom, Elijah Thimsen
Summary: This study presents a framework for correlating plasma parameters with the reduction potential near the plasma-liquid interface, and experimental results show good agreement between model-predicted values and measured values.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Astronomy & Astrophysics
Chuanpeng Hou, Jiansen He, Xingyu Zhu, Ying Wang
Summary: By analyzing data from the Magnetospheric Multiscale Spacecraft, it is shown that magnetic reconnection events have an impact on the energy dissipation of structures in turbulent plasmas at the electron scale. Despite their strong dissipation ability locally, their overall contribution to energy dissipation is relatively small.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Tak Chu Li, Yi-Hsin Liu, Yi Qi
Summary: Magnetic reconnection has been recognized to play an important role in the dynamics and energetics of plasma turbulence over the past two decades. A new method based on magnetic flux transport has been developed to identify active reconnection X-points, which has been successfully applied in gyrokinetic simulations. This method could provide new observational tools for spacecraft missions.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Review
Physics, Multidisciplinary
Raffaele Marino, Luca Sorriso-Valvo
Summary: One characteristic trait of space plasmas is the multi-scale dynamics resulting from non-linear transfers and conversions of various forms of energy. Turbulence is a major cross-scale energy transfer mechanism in space plasmas, affecting the energy fate at intermediate scales. Other mechanisms, such as magnetic reconnection and particle energization, also contribute to the challenging prediction of the dynamical state of space plasmas. In recent decades, scaling laws and advanced methodologies have played a crucial role in characterizing the energy transfer in space plasmas, together with robotic missions.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2023)
Article
Physics, Applied
Farhang Loran, Ali Mostafazadeh
Summary: This study provides a precise characterization of a higher-dimensional generalization of the unidirectional invisibility effect and identifies the conditions for its realization in scalar and electromagnetic wave scattering. The approach allows for the construction of potentials and linear dielectric media that exhibit perfect directional invisibility in a finite frequency domain.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Mingkang Wang, Diego J. Perez-Morelo, Vladimir Aksyuk
Summary: Advances in integrated photonics have enabled the fabrication of high-sensitivity and broadband sensors, with a focus on overcoming thermal dynamics effects. Researchers have developed a frequency-dependent photonic sensor transfer function to accurately measure dynamic signals at high optical power levels.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Physics, Fluids & Plasmas
P. Tretinnikov, E. Gusakov, S. Heuraux
Summary: This paper provides an analytical description of the collective Thomson scattering (CTS) experiment, specifically focusing on the distortion of probing microwave beams due to plasma edge turbulence. The effect of turbulence on the registered frequency spectrum distortion is evaluated for plasma parameters similar to those expected in ITER.
PHYSICS OF PLASMAS
(2023)
Article
Geosciences, Multidisciplinary
Z. H. Zhong, D. B. Graham, Yu. V. Khotyaintsev, M. Zhou, O. Le Contel, R. X. Tang, X. H. Deng
Summary: We investigate whistler-mode waves and broadband electrostatic waves within an ion diffusion region (IDR) at the magnetopause. The whistlers are linked with Buneman-type waves by the electron Pacman distribution rather than the wave-wave process, advancing understanding of the relation between plasma waves and plasma kinetics in the IDR. These results provide a new view of the relationship between the quasi-parallel whistlers, the oblique whistlers, and the broadband electrostatic waves, indicating their association with electron and ion beams in the diffusion region.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Physics, Applied
Gaokun Yu, Yanping Qiu, Yong Li, Xinlong Wang, Ning Wang
Summary: The paper proposes a broadband 2-bit coding metasurface to reduce the scattering cross section of an object by destructive interferences among waves scattered by different coding elements, achieving a high fractional bandwidth of 95.62% and SCS reduction exceeding -10 dB for acoustic stealth. Compared to previous underwater acoustic carpet cloaks, this method greatly expands the bandwidth of SCS reduction through destructive interferences.
PHYSICAL REVIEW APPLIED
(2021)
Article
Engineering, Aerospace
Debasish Roy, Biswajit Sahu
Summary: The study focuses on the nonlinear ion-acoustic wave (IAW) excitations in an electron-pair-ion quantum plasma induced by a moving charged object, deriving a forced Korteweg-de Vries (fKdV) type equation and investigating the impact of plasma parameters on solitonic excitations. Numerical simulations show significant effects of quantum parameters on the propagation characteristics of nonlinear excitations.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Acoustics
X. D. Tong, H. Y. Chen, Y. Chen
Summary: The study focuses on the low-frequency broadband noise radiated by highly skewed propeller due to inflow turbulence. By calculating the thrust spectrum, pressure spectrum, and analyzing the radiated noise power of force sources and velocity sources, the relationship between modal characteristics and radiated noise, as well as the influence of inflow conditions on noise level, are discussed for potential reduction of propeller vibration and noise.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Mechanics
Dandan Xiao, Huw Borradaile, Kwing-So Choi, Lihao Feng, Jinjun Wang, Xuerui Mao
Summary: The study investigates bypass transition in flow over a flat plate triggered by a pair of dielectric-barrier-discharge plasma actuators. The plasma actuators generate a pair of counter-rotating streamwise vortices downstream, leading to the formation of high- and low-speed streaks. With wide and narrow layouts of the actuators, different patterns of symmetric and asymmetric disturbances are observed, resulting in 'W' and 'V' shapes, respectively. Linear analysis techniques confirm the observed phenomena of secondary instabilities and the breakdown of streaks.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Optics
Shawn Divitt, Abbie T. Watnik
Summary: This study examines the spectral and spatial correlations of broadband, around-the-corner speckle and presents a set of equations to locate the spatial maximum of the paraxial spatial-spectral correlation function. The validity of the spatial-spectral correlation framework is confirmed through experimental, theoretical, and simulation methods.
Article
Astronomy & Astrophysics
I. Y. Vasko, K. Alimov, T. Phan, S. D. Bale, F. S. Mozer, A. Artemyev
Summary: In this study, we analyzed proton kinetic-scale current sheets in the solar wind and found that smaller-scale current sheets have higher current density, but do not exceed the drift between ions and electrons of local Alven speed. This observation holds in normalized units.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Physics, Fluids & Plasmas
P. I. Shustov, A. V. Artemyev, A. S. Volokitin, I. Y. Vasko, X. -J. Zhang, A. A. Petrukovich
Summary: Recent observations in Earth's magnetotail and magnetosheath have shown the presence of nonlinear sub-ion scale magnetic holes, which are localized dips in magnetic field intensity. These structures, resembling magnetosonic solitary waves, are balanced by hot electron pressure rather than significant density perturbations. Investigating linear modes of hot plasma with two electron components (hot and cold) reveals an electromagnetic mode with nearly cross field propagation and absence of density perturbations, resembling an electron magnetosonic mode.
PHYSICS OF PLASMAS
(2022)
Article
Astronomy & Astrophysics
A. V. Artemyev, X. Shi, T. Z. Liu, X. -J. Zhang, I. Vasko, V. Angelopoulos
Summary: Investigation of electron energization at (and around) the Earth's bow shock is critical to our understanding of space weather and astrophysical phenomena. In this study, using THEMIS and ARTEMIS wave measurements, we quantified the nonlinear effects of resonant interactions between >= 100 eV electrons and intense coherent whistler waves, and found that trapped electrons can gain energy up to several hundreds of eV.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2022)
Article
Astronomy & Astrophysics
A. Larosa, T. Dudok de Wit, V. Krasnoselskikh, S. D. Bale, O. Agapitov, J. Bonnell, C. Froment, K. Goetz, P. Harvey, J. Halekas, M. Kretzschmar, R. MacDowall, David M. Malaspina, M. Moncuquet, J. Niehof, M. Pulupa, C. Revillet
Summary: The study reports on the direct measurement of the magnetic signature of electromagnetic emissions in the solar wind using the Parker Solar Probe/FIELDS instrument. It reveals the presence of magnetic components in the slow extraordinary modes in an inhomogeneous plasma, which is influenced by density inhomogeneities.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
A. B. Lotekar, I. Y. Vasko, T. Phan, S. D. Bale, T. A. Bowen, J. Halekas, A. Artemyev, Yu Khotyaintsev, F. S. Mozer
Summary: This study presents statistical analysis of proton kinetic-scale current sheets observed by the Parker Solar Probe. The analysis reveals the range and typical values for the thickness and current density of these current sheets, as well as their asymmetry and relationship with scale and magnetic shear angles. The findings suggest that these proton kinetic-scale current sheets are produced by turbulence cascade and are not suppressed by the diamagnetic mechanism.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
F. S. Mozer, S. D. Bale, C. A. Cattell, J. Halekas, I. Y. Vasko, J. L. Verniero, P. J. Kellogg
Summary: Research on the orbits of Parker Solar Probe has shown that solar wind core electrons emerge from 15 solar radii with a temperature of 55 +/- 5 eV, regardless of solar wind speed. The core electron temperature then varies with radial distance due to cooling caused by adiabatic expansion. Triggered ion acoustic waves can heat the core electrons up to twice the minimum temperature observed.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Geosciences, Multidisciplinary
I. Y. Vasko, F. S. Mozer, S. D. Bale, A. Artemyev
Summary: This study presents an analysis of electrostatic waves observed near the quasi-perpendicular Earth's bow shock by the Magnetospheric Multiscale spacecraft. The analysis reveals that these electrostatic waves have large amplitudes and can propagate almost perpendicular to the local magnetic field. The results suggest that these waves may strongly affect the dynamics of electrons in collisionless shocks.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Astronomy & Astrophysics
T. Dudok de Wit, V. V. Krasnoselskikh, O. Agapitov, C. Froment, A. Larosa, S. D. Bale, T. Bowen, K. Goetz, P. Harvey, G. Jannet, M. Kretzschmar, R. J. MacDowall, D. Malaspina, P. Martin, B. Page, M. Pulupa, C. Revillet
Summary: Parker Solar Probe, the first mission to directly probe the innermost heliosphere, has made significant discoveries in the dynamic and structured outer solar corona through measuring fluctuating magnetic fields. These discoveries include the observation of various solar wind wave phenomena and their interaction with energetic electrons.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2022)
Article
Astronomy & Astrophysics
I. C. Jebaraj, J. Magdalenic, V Krasnoselskikh, V Krupar, S. Poedts
Summary: This study reports the existence of numerous structured type III radio bursts observed during the STEREO era. The aim is to classify and describe the characteristics of these bursts and to understand the physical mechanism behind their generation. Data from STEREO and Wind spacecraft were used, along with spectral analysis of the fine structures. The results indicate similarities in the fine structures of type III bursts at metric-decameter and interplanetary wavelengths, suggesting a common physical process responsible for their generation.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Vladimir Krasnoselskikh, Bruce T. Tsurutani, Thierry Dudok de Wit, Simon Walker, Michael Balikhin, Marianne Balat-Pichelin, Marco Velli, Stuart D. Bale, Milan Maksimovic, Oleksiy Agapitov, Wolfgang Baumjohann, Matthieu Berthomier, Roberto Bruno, Steven R. Cranmer, Bart de Pontieu, Domingos de Sousa Meneses, Jonathan Eastwood, Robertus Erdelyi, Robert Ergun, Viktor Fedun, Natalia Ganushkina, Antonella Greco, Louise Harra, Pierre Henri, Timothy Horbury, Hugh Hudson, Justin Kasper, Yuri Khotyaintsev, Matthieu Kretzschmar, Sam Krucker, Harald Kucharek, Yves Langevin, Benoit Lavraud, Jean-Pierre Lebreton, Susan Lepri, Michael Liemohn, Philippe Louarn, Eberhard Moebius, Forrest Mozer, Zdenek Nemecek, Olga Panasenco, Alessandro Retino, Jana Safrankova, Jack Scudder, Sergio Servidio, Luca Sorriso-Valvo, Jan Soucek, Adam Szabo, Andris Vaivads, Grigory Vekstein, Zoltan Voeroes, Teimuraz Zaqarashvili, Gaetano Zimbardo, Andrei Fedorov
Summary: The ICARUS mission aims to understand the magnetic field and plasma dynamics in the outer solar atmosphere and their effects on the corona, solar wind, and heliosphere. This research is important for the fields of space plasma physics and astrophysics.
EXPERIMENTAL ASTRONOMY
(2022)
Article
Astronomy & Astrophysics
C. Froment, O. V. Agapitov, V. Krasnoselskikh, S. Karbashewski, T. Dudok de Wit, A. Larosa, L. Colomban, D. Malaspina, M. Kretzschmar, V. K. Jagarlamudi, S. D. Bale, J. W. Bonnell, F. S. Mozer, M. Pulupa
Summary: The study aims to investigate the parameters of whistler waves in the young solar wind using the Parker Solar Probe (PSP). The results show that most of the detected wave packets in the cross-spectra are quasi-parallel to the background magnetic field, but a significant portion of the waves have oblique wave normal angles. It is concluded that magnetic dips provide favorable conditions for the generation of whistler waves.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
O. V. Agapitov, V. Krasnoselskikh, M. Balikhin, J. W. Bonnell, F. S. Mozer, L. Avanov
Summary: The evolution of plasma entropy and the redistribution of plasma energy at the collisionless plasma shock front were evaluated using high temporal resolution data from four Magnetospheric Multiscale spacecraft. Different populations of ions were observed near the shock front, and their moments were determined separately. It was found that the solar wind core population velocity slows down mainly in the ramp region, and the proton temperature peak in the foot region is an effect of relative motion of different ion populations. The ion entropy showed a significant increase across the shock, while the entropy of electrons did not show a significant change. Rating: 8/10.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Immanuel Christopher Jebaraj, Vladimir Krasnoselskikh, Marc Pulupa, Jasmina Magdalenic, Stuart D. Bale
Summary: This research report presents the first detailed observations of type III fundamental-harmonic pairs in hectokilometric wavelengths, observed by the Parker Solar Probe. The report provides a statistical analysis of the spectral characteristics, polarization measurements, and other characteristics of the fundamental-harmonic pairs, drawing conclusions based on the observations.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
L. Colomban, O. V. Agapitov, V. Krasnoselskikh, M. Kretzschmar, T. Dudok de Wit, S. Karbashewski, F. S. Mozer, J. W. Bonnell, S. Bale, D. Malaspina, N. E. Raouafi
Summary: This article discusses the technical issues and limitations of the search-coil magnetometer aboard Parker Solar Probe (PSP) and proposes a method to reconstruct missing components using the electric field instrument. The method has been validated and successfully applied to determine the polarization of a whistler event.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Vladimir Krasnoselskikh, Arnaud Zaslavsky, Anton Artemyev, Clara Froment, Thierry Dudok de Wit, Nour E. Raouafi, Oleksiy V. Agapitov, Stuart D. Bale, Jaye L. Verniero
Summary: The exploration of the inner heliosphere by the Parker Solar Probe has revealed the presence of switchbacks in the highly structured solar wind, which may be generated by interchange reconnection (IR). Although IR does not significantly contribute to the heating and acceleration of the solar wind, it affects the way the solar wind is connected to its sources and can lead to a new energy balance.
ASTROPHYSICAL JOURNAL
(2023)
