Bibliographies thématiques / Electrostatic shock wave

Littérature scientifique sur le sujet « Electrostatic shock wave »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Electrostatic shock wave"

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Singh, Manpreet, Federico Fraschetti et Joe Giacalone. « Electrostatic Plasma Wave Excitations at the Interplanetary Shocks ». Astrophysical Journal 943, no 1 (1 janvier 2023) : 16. http://dx.doi.org/10.3847/1538-4357/aca7c6.

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Abstract Over the last few decades, different types of plasma waves (e.g., the ion acoustic waves (IAWs), electrostatic solitary waves, upper/lower hybrid waves, and Langmuir waves) have been observed in the upstream, downstream, and ramp regions of the collisionless interplanetary (IP) shocks. These waves may appear as short-duration (only a few milliseconds at 1 au) electric field signatures in the in-situ measurements, with typical frequencies of ∼1–10 kHz. A number of IAW features at the IP shocks seem to be unexplained by kinetic models and require a new modeling effort. Thus, this paper is dedicated to bridging this gap in understanding. In this paper, we model the linear IAWs inside the shock ramp by devising a novel linearization method for the two-fluid magnetohydrodynamic equations with spatially dependent shock parameters. It is found that, for parallel propagating waves, the linear dispersion relation leads to a finite growth rate, which is dependent on the shock density compression ratio, as Wind data suggest. Further analysis reveals that the wave frequency grows towards the downstream region within the shock ramp, and the wave growth rate is independent of the electron-to-ion temperature ratio, as Magnetospheric Multiscale (MMS) in-situ measurements suggest, and is uniform within the shock ramp. Thus, this study helps in understanding the characteristics of the IAWs at the collisionless IP shocks.
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Dwivedi, C. B., et B. P. Pandey. « Electrostatic shock wave in dusty plasmas ». Physics of Plasmas 2, no 11 (novembre 1995) : 4134–39. http://dx.doi.org/10.1063/1.871037.

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Kamaletdinov, S. R., I. Y. Vasko, A. V. Artemyev, R. Wang et F. S. Mozer. « Quantifying electron scattering by electrostatic solitary waves in the Earth's bow shock ». Physics of Plasmas 29, no 8 (août 2022) : 082301. http://dx.doi.org/10.1063/5.0097611.

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The electrostatic fluctuations are always present in the Earth's bow shock at frequencies above about 100 Hz, but the effects of this wave activity on electron dynamics have not been quantified yet. In this paper, we quantify electron pitch-angle scattering by electrostatic solitary waves, which make up a substantial part of the electrostatic fluctuations in the Earth's bow shock and were recently shown to be predominantly ion holes. We present analytical estimates and test-particle simulations of electron pitch-angle scattering by ion holes typical of the Earth's bow shock and conclude that this scattering can be rather well quantified within the quasi-linear theory. We use the observed distributions of ion hole parameters to estimate pitch-angle scattering rates by the ensemble of ion holes typical of the Earth's bow shock. We use the recently proposed theory of stochastic shock drift acceleration to show that pitch-angle scattering of electrons by the electrostatic fluctuations can keep electrons in the shock transition region long enough to support acceleration of thermal electrons by a factor of a few tens, that is up to a few hundred eV. Importantly, the electrostatic fluctuations can be more efficient in pitch-angle scattering of [Formula: see text] keV electrons, than typically observed whistler waves.
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MALEKOLKALAMI, BEHROOZ, et TAIMUR MOHAMMADI. « Propagation of solitary waves and shock wavelength in the pair plasma ». Journal of Plasma Physics 78, no 5 (22 février 2012) : 525–29. http://dx.doi.org/10.1017/s0022377812000219.

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AbstractThe propagation of electrostatic waves is studied in plasma system consisting of pair-ions and stationary additional ions in presence of the Sagdeev potential (pseudopotential) as function of electrostatic potential (pseudoparticle). It is remarked that both compressive and rarefective solitary waves can be propagated in this plasma system. These electrostatic solitary waves, however, cannot be propagated if the density of stationary ions increases from one critical value or decreases from another when the temperature and the Mach number are fixed. Also, when pseudoparticle is affected with a little dissipation of energy, it is trapped in potential well and can oscillate. Oscillations generate shock wave in the media, and in the negative minimal point of the well it is possible to compute numerically the shock wavelength for the allowed values of the plasma parameters.
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Yu, Chunkai, Zhongwei Yang, Xinliang Gao, Quanming Lu et Jian Zheng. « Electron Acceleration by Moderate-Mach-number Low-β Shocks : Particle-in-Cell Simulations ». Astrophysical Journal 930, no 2 (1 mai 2022) : 155. http://dx.doi.org/10.3847/1538-4357/ac67df.

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Abstract Particle acceleration is ubiquitous at shock waves, occurring on scales ranging from supernova remnants in the universe to coronal-mass-ejection-driven shocks and planetary bow shocks in the heliosphere. The most promising mechanism responsible for the almost universally observed power-law spectra is diffusive shock acceleration (DSA). However, how electrons are preaccelerated by different shocks to the energy required by the DSA theory is still unclear. In this paper, we perform two-dimensional particle-in-cell plasma simulations to investigate how the magnetic field orientations, with respect to simulation planes, affect electron preacceleration in moderate-Mach-number low- β shocks. Simulation results show that instabilities can be different as the simulation planes capture different trajectories of particles. For magnetic fields perpendicular to the simulation plane, electron cyclotron drift instability dominates in the foot. Electrons can be trapped by the electrostatic wave and undergo shock-surfing acceleration. For magnetic fields lying in the simulation plane, whistler waves produced by modified two-stream instability dominate in the foot and scatter the electrons. In both cases, electrons undergo multistage acceleration in the foot, shock surface, and immediate downstream, during which process shock-surfing acceleration takes place as part of the preacceleration mechanism in moderate-Mach-number quasi-perpendicular shocks.
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Pottelette, R., R. A. Treumann et E. Georgescu. « Crossing a narrow-in-altitude turbulent auroral acceleration region ». Nonlinear Processes in Geophysics 11, no 2 (14 avril 2004) : 197–204. http://dx.doi.org/10.5194/npg-11-197-2004.

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Abstract. We report on the in situ identification of a narrow electrostatic acceleration layer (electrostatic shock) containing intense plasma turbulence in the upward current region, and its effect on auroral particles. Wave turbulence recorded in the center of the layer differs in character from that recorded above and beneath. It is concluded that the shock is sustained by different nonlinear waves which, at each level, act on the particles in such a way to produce a net upward directed electric field. The main power is in the ion acoustic range. We point out that anomalous resistivities are incapable of locally generating the observed parallel potential drop.
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Verheest, Frank. « Comment on ‘Propagation of solitary waves and shock wavelength in the pair plasma (J. Plasma Phys. 78, 525–529, 2012)’ ». Journal of Plasma Physics 80, no 3 (25 mars 2014) : 513–16. http://dx.doi.org/10.1017/s0022377814000051.

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In a recent paper ‘Propagation of solitary waves and shock wavelength in the pair plasma (J. Plasma Phys. 78, 525–529, 2012)’, Malekolkalami and Mohammadi investigate nonlinear electrostatic solitary waves in a plasma comprising adiabatic electrons and positrons, and a stationary ion background. The paper contains two parts: First, the solitary wave properties are discussed through a pseudopotential approach, and then the influence of a small dissipation is intuitively sketched without theoretical underpinning. Small dissipation is claimed to lead to a shock wave whose wavelength is determined by linear oscillator analysis. Unfortunately, there are errors and inconsistencies in both the parts, and their combination is incoherent.
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Jahan, Sharmin, Subrata Banik, Nure Alam Chowdhury, Abdul Mannan et A. A. Mamun. « Electrostatic Shock Structures in a Magnetized Plasma Having Non-Thermal Particles ». Gases 2, no 2 (25 mars 2022) : 22–32. http://dx.doi.org/10.3390/gases2020002.

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A rigorous theoretical investigation has been made on the nonlinear propagation of dust-ion-acoustic shock waves in a multi-component magnetized pair-ion plasma (PIP) having inertial warm positive and negative ions, inertialess non-thermal electrons and positrons, and static negatively charged massive dust grains. The Burgers’ equation is derived by employing the reductive perturbation method. The plasma model supports both positive and negative shock structures in the presence of static negatively charged massive dust grains. It is found that the steepness of both positive and negative shock profiles declines with the increase of ion kinematic viscosity without affecting the height, and the increment of negative (positive) ion mass in the PIP system declines (enhances) the amplitude of the shock profile. It is also observed that the increase in oblique angle raises the height of the positive shock profile, and the height of the positive shock wave increases with the number density of positron. The applications of the findings from the present investigation are briefly discussed.
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Thejappa, G. « Evidence for the Three Wave Interactions in the Vicinity of an Interplanetary Shock ». Astrophysical Journal 937, no 1 (1 septembre 2022) : 28. http://dx.doi.org/10.3847/1538-4357/ac8b07.

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Abstract We present the high time resolution in situ observations of coherent one-dimensional magnetic-field-aligned Langmuir wave packets with well-defined low frequency modulations (beats) in the upstream region of a coronal mass ejection driven supercritical quasi-perpendicular interplanetary (IP) shock. We show that these beat-type waveforms provide what is believed to be the first observational evidence for one of the most important three wave interactions, called the electrostatic decay instability (ESD) L → L ′ + S (L is the pump Langmuir wave excited by the shock accelerated electron beam, and L′ and S are the daughter Langmuir and ion sound waves, respectively). We also show that (1) the spectra of these wave packets contain the signatures of L, L′, and S, which satisfy the resonance conditions required for excitation of ESD, (2) the peak intensities of these wave packets well exceed the ESD threshold values, and (3) the speed of the electron beam estimated using the resonance conditions is very close to the typical observed speeds of the IP shock accelerated electron beams. The implication of these findings is that (1) the shock accelerated electron beams probably are stabilized by the three wave interaction L → L ′ + S , and (2) the second harmonic radio emission T 2 f pe of solar type II radio bursts probably is excited by the three wave merging L + L ′ → T 2 f pe .
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TRIBECHE, MOULOUD, LEILA AIT GOUGAM, NADIA BOUBAKOUR et TAHA HOUSSINE ZERGUINI. « Electrostatic solitary structures in a charge-varying pair–ion–dust plasma ». Journal of Plasma Physics 73, no 3 (juin 2007) : 403–15. http://dx.doi.org/10.1017/s0022377806004636.

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AbstractLarge-amplitude electrostatic solitary structures are investigated in an unmagnetized charge-varying pair–ion–dust plasma in which electrons and positrons have equal masses. Their spatial patterns are significantly modified by the presence of the positron component. In particular, it may be noted that an addition of a small concentration of positrons abruptly reduces the potential pulse amplitude as well as the net negative charge residing on the dust grain surface. Under certain conditions, the solitary wave suffers the well-known anomalous damping leading to the development of collisionless shock waves. This investigation may be taken as a prerequisite for the understanding of the electrostatic solitary waves that may occur in space dusty plasmas.
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Thèses sur le sujet "Electrostatic shock wave"

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Shin, Koichi. « Study on electrostatic waves in the terrestrial bow shock region via spacecraft observations ». 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136234.

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Chapitres de livres sur le sujet "Electrostatic shock wave"

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Shin, K., H. Kojima, H. Matsumoto et T. Mukai. « Electrostatic Quasi-Monochromatic Waves Downstream of the Bow Shock : Geotail Observations ». Dans Frontiers in Magnetospheric Plasma Physics - Celebrating 10 Years of Geotail Operation, Proceedings of the 16th COSPAR Colloquium held at the Institute of Space and Astronautical Science (ISAS), 293–96. Elsevier, 2005. http://dx.doi.org/10.1016/s0964-2749(05)80044-7.

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Actes de conférences sur le sujet "Electrostatic shock wave"

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Haruki, T. « Magnetic field generation and electrostatic shock wave formation driven by counter-streaming pair plasmas ». Dans PLASMA PHYSICS : 11th International Congress on Plasma Physics : ICPP2002. AIP, 2003. http://dx.doi.org/10.1063/1.1594041.

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Takana, Hidemasa, Kazuhiro Ogawa, Tetsuo Shoji et Hideya Nishiyama. « Optimization of Cold Gas Dynamic Spray Processes by Computational Simulation ». Dans ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37081.

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An integrated model of compressible thermofluid, splat formation and coating formation for a cold dynamic spray process has been established. In-flight behavior of nano-micro particles and the interaction between the shock wave and the particles in a supersonic jet flow impinging onto the substrate and further particle acceleration with electrostatic force are clarified in detail by considering viscous drag force, flow acceleration, added mass, gravity, Basset history force, Saffman lift force, Brownian motion, thermophoresis and electrostatic force. The effect of electrostatic acceleration becomes more significant with the decrease in particle diameter even in the presence of unavoidable shock wave. As a result, electrostatic acceleration can broaden the application range of operating particle diameter in a cold gas dynamic spray process to form a robust and activated coating. Finally, based on the integrated model, the coating thickness characteristics in an electrostatic assisted cold dynamic spray process are evaluated.
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Schrama, Claudia A. M., Jonathan J. Barolak, Daniel Adams et Charles Durfee. « Two-Color Time-Resolved Interferometry for Shock-Wave and Conductivity Analysis of a Threshold Electrostatic Discharge ». Dans Computational Optical Sensing and Imaging. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cosi.2022.cm1a.6.

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We are using a two-color Mach-Zehnder interferometer with multi-frame cameras to measure the electrode and neutral atom density in a threshold electrostatic discharge system through FFT phase retrieval using visible and IR laser sources.
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Sieberer, Stefan, Atanas A. Popov et Stewart McWilliam. « Shock-Induced Electrostatic Coupling of Modes of Vibration in the Response of a MEMS Ring Sensor ». Dans ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70915.

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This paper is concerned with non-linear coupling of in-plane rigid-body and flexural motion in capacitive MEMS ring sensors due to shock excitation. A Lagrangian approach is used to derive the equations of motion for the system, including non-linear electrostatic forces. The shock acceleration is modelled as a half-sine wave input and acts on the rigid-body motion only. The mechanism of modal coupling is derived theoretically, and numerical simulations are performed to quantify the coupling. Different electrode configurations are considered by including electrostatic plates both inside and outside the ring, and insights into modal coupling are gained.
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Stepanov, A. N., M. A. Garasev, V. V. Kocharovsky, A. I. Korytin, Yu A. Malrkov, A. A. Murzanev et A. A. Nechaev. « Generation of magnetic fields behind the front of an electrostatic shock wave in a laser plasma ». Dans 2018 International Conference Laser Optics (ICLO). IEEE, 2018. http://dx.doi.org/10.1109/lo.2018.8435840.

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Marayikkottu Vijayan, Akhil, Saurabh S. Sawant, Pooja Rao et Deborah A. Levin. « Study of inert simulated particle transportation in a moving shock/pressure wave generated by electrostatic discharges ». Dans AIAA Scitech 2019 Forum. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-0631.

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Marayikkottu Vijayan, Akhil, Saurabh S. Sawant, Pooja Rao et Deborah A. Levin. « Correction : Study of inert simulated particle transportation in a moving shock/pressure wave generated by electrostatic discharges ». Dans AIAA Scitech 2019 Forum. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-0631.c1.

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Takana, H., K. Ogawa, T. Shoji et H. Nishiyama. « Electrostatic Assist on a Cold Spray Process by Computational Simulation ». Dans ITSC2007, sous la direction de B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima et G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0090.

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Abstract The integrated model of thermofluid, splat formation and coating formation for a cold spray process has been established. The in-flight behavior of micro and submicron particles, the interaction between shock wave and particles in a supersonic jet impinging onto the substrate are clarified by this integrated model in detail. Then, the effect of electrostatic force on the particle acceleration is discussed in detail by carrying out a real-time computational simulation. It is shown that coating can be formed with the assist of electrostatic acceleration even though there is a lack of particle acceleration over critical velocity only through momentum transfer from airflow. Thus, the utilization of electrostatic acceleration enhances the performance of cold spray coating and contributes the extension of application range of a cold spray process.
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Anishchenko, S., V. Baryshevsky et A. Gurinovich. « Electrostatic cumulation : a convenient research instrument to obtain Mbar pressures in solids ». Dans 8th International Congress on Energy Fluxes and Radiation Effects. Crossref, 2022. http://dx.doi.org/10.56761/efre2022.s1-p-044901.

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Magnetic cumulation is not the sole phenomenon capable to produce high-dense electron beams in relativistic vacuum diodes. Electrostatic cumulation phenomenon also exists and reveals at much lower accelerating voltages in relativistic diodes with a ring-type cathode. A distinctive feature of electrostatic cumulation is quite low spread of electron energies in the produced high-dense beam. These circumstances give advantages to electrostatic cumulation phenomenon if the latter is considered as a convenient research instrument for high energy density physics. Electrostatically cumulated electron beam with energy of 400 keV is capable of exciting a shock wave with an amplitude of 0.25 Mbar in a tungsten plate, which can be used to compress a target. Research can be carried out using one high-current beam or several.
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Moretti, Giacomo, Marco Fontana et Rocco Vertechy. « Modeling and Control of Lozenge-Shaped Dielectric Elastomer Generators ». Dans ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3258.

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Dielectric Elastomers (DEs) are a very promising technology for the development of energy harvesting devices based on the variable-capacitance electrostatic generator principle. As compared to other technologies, DE Generators (DEGs) are solid-state energy conversion systems which potentially feature: 1) large energy densities, 2) good energy conversion efficiency that is rather independent of cycle frequency, 3) easiness of manufacturing and assembling, 4) high shock resistance, 5) silent operation, 6) low cost. Envisioned applications for DEGs are in devices that convert ocean wave energy into usable electricity. This paper introduces the Lozenge-Shaped DEG (LS-DEG) that is a specific type of planar DE transducer with one degree of freedom. A LS-DEG consists of a planar DE membrane that is connected along its perimeter to the links of a parallelogram four-bar mechanism. As the mechanism is put into reciprocal motion, the DE membrane varies its capacitance that is then employed as a charge pump to convert external mechanical work into usable electricity. Specifically, this paper describes the functioning principle of LS-DEGs, and provides a comparison between different hyper-elastic models that can be used to predict the energy harvesting performances of realistic prototypes. Case studies are presented which address the constrained optimization of LS-DEGs subjected to failure criteria and practical design constraints.
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