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Gotowa bibliografia na temat „Alfven waves-Magnetized plasmas”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Alfven waves-Magnetized plasmas"

1

Sallago, P. A. "STABILITY OF ALFVEN WINGS IN HMHD". Anales AFA 32, nr 1 (15.04.2021): 1–6. http://dx.doi.org/10.31527/analesafa.2021.32.1.1.

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A conducting source moving uniformly through a magnetized plasma generates, among a variety of perturbations,Alfvén waves. Alfvén waves can build up structures in the plasma called Alfvén wings. The wings have been detec-ted and measured in many solar system bodies, and their existence have been theoretically proved also. Under certainconditions, Hall and electronic pressure must be taken into account in the Ohm’s law and so one gets Hall Magne-tohydrodynamics (HMHD). In spite of Sallago and Platzeck have shown the existence of Alfvén wings in HMHD, theirstability under such conditions remains to be studied. The aim of this paper is to analyze the stability of an Alfvén wing,in the presence of an incompressible perturbation that has the same symmetry than the structure and polarization, inHMHD. Palumbo has developed an analytical method for the study of the stability of static structures with a symmetryin magnetized plasmas, in the presence of incompressible perturbations with the same symmetry than the structure.Since Alfvén wings are stationary structures, Sallago and Platzeck have shown the stability of such Alfvén wings in MHD conditions by extending Palumbo’s method. In the present paper this method is extended for Alfvén wings in HMHD conditions, and one concludes that in the presence of this kind of perturbations they are stable.

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Tishchenko, Vladimir, Artem Berezutsky, Leila Dmitrieva, Ilya Miroshnichenko i Ildar Shaikhislamov. "Generation of Alfvén waves in magnetized plasma by laser plasma bunches at Mach numbers much less than unity". Solar-Terrestrial Physics 8, nr 2 (30.06.2022): 91–97. http://dx.doi.org/10.12737/stp-82202214.

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In this paper, we examine a torsional Alfvén wave produced by periodic plasma bunches in a magnetized plasma flux tube. A new effect has been revealed: the wave is generated not only during the action of bunches, but also for a long time after the termination, which makes it possible to increase the wavelength by several times. We have determined the conditions under which the wave contains η~40 % of the total bunch energy. The wave radius depends on the energy of one bunch; and the length, on their number. The optimum number of bunches is 15. Simultaneously with the Alfvén wave, a bunch plasma jet (η~35 %) and a slow magnetosonic wave (η~10 %) propagate in the force tube. Similarity parameters scale the results to laboratory and near-Earth magnetized plasma.

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Cramer, N. F. "Alfvén resonance absorption in electron-positron plasmas". Proceedings of the International Astronomical Union 6, S274 (wrzesień 2010): 224–27. http://dx.doi.org/10.1017/s1743921311006983.

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AbstractWaves propagating obliquely in a magnetized cold pair plasma experience an approximate resonance in the wavevector component perpendicular to the magnetic field, which is the analogue of the Alfvén resonance in normal electron-ion plasmas. Wave absorption at the resonance can take place via mode conversion to the analogue of the short wavelength inertial Alfvén wave. The Alfvén resonance could play a role in wave propagation in the pulsar magnetosphere leading to pulsar radio emission. Ducting of waves in strong plasma gradients may occur in the pulsar magnetosphere, which leads to the consideration of Alfvén surface waves, whose energy is concentrated in the region of strong gradients.

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Wang, L. P., Z. B. Guo, Z. J. Mao i Y. Zhang. "Phase finite time singularity: On the dissolution of a surface MHD eigenmode to the Alfvén continuum". Physics of Plasmas 30, nr 3 (marzec 2023): 032105. http://dx.doi.org/10.1063/5.0132609.

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Phase mixing is a general mechanism of collisionless damping in magnetized plasmas. In a MHD model, the carrier of phase mixing is the Alfvén wave continuum, which is driven by the plasma inhomogeneity. In this work, we study the non-resonant conversion of a surface MHD eigenmode to the Alfvén continuum. It is shown that the finite-time-singularity of the phase of the surface mode can smear its periodic oscillation and induces the excitation of the local Alfvén waves. This type of mode conversion would enhance the collisionless dissipation of the surface eigenmode, i.e., accelerating its dissolution to the Alfvén continuum. The non-resonant mode conversion and damping mechanism explored here have potential applications to understand the physics of collisionless dissipation of various eigenmodes in magnetized plasmas.

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SALLAGO, P. A., i A. M. PLATZECK. "Stability of Alfvén wings in uniform plasmas". Journal of Plasma Physics 73, nr 6 (grudzień 2007): 957–66. http://dx.doi.org/10.1017/s0022377807006460.

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AbstractA conducting source moving uniformly through a magnetized plasma generates, among a variety of perturbations, Alfvén waves. An interesting characteristic of Alfvén waves is that they can build up structures in the plasma called Alfvén wings. These wings have been detected and measured in many solar system bodies, and their existence has also been theoretically proven. However, their stability remains to be studied. The aim of this paper is to analyze the stability of an Alfvén wing developed in a uniform background field, in the presence of an incompressible perturbation that has the same symmetry as the Alfvén wing, in the magnetohydrodynamic approximation. The study of the stability of a magnetohydrodynamic system is often performed by linearizing the equations and using either the normal modes method or the energy method. In spite of being applicable for many problems, both methods become algebraically complicated if the structure under analysis is a highly non-uniform one. Palumbo has developed an analytical method for the study of the stability of static structures with a symmetry in magnetized plasmas, in the presence of incompressible perturbations with the same symmetry as the structure (Palumbo 1998 Thesis, Universidad de Firenze, Italia). In the present paper we extend this method for Alfvén wings that are stationary structures, and conclude that in the presence of this kind of perturbation they are stable.

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6

Muñoz, V., F. A. Asenjo, M. Domínguez, R. A. López, J. A. Valdivia, A. Viñas i T. Hada. "Large-amplitude electromagnetic waves in magnetized relativistic plasmas with temperature". Nonlinear Processes in Geophysics 21, nr 1 (14.02.2014): 217–36. http://dx.doi.org/10.5194/npg-21-217-2014.

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Abstract. Propagation of large-amplitude waves in plasmas is subject to several sources of nonlinearity due to relativistic effects, either when particle quiver velocities in the wave field are large, or when thermal velocities are large due to relativistic temperatures. Wave propagation in these conditions has been studied for decades, due to its interest in several contexts such as pulsar emission models, laser-plasma interaction, and extragalactic jets. For large-amplitude circularly polarized waves propagating along a constant magnetic field, an exact solution of the fluid equations can be found for relativistic temperatures. Relativistic thermal effects produce: (a) a decrease in the effective plasma frequency (thus, waves in the electromagnetic branch can propagate for lower frequencies than in the cold case); and (b) a decrease in the upper frequency cutoff for the Alfvén branch (thus, Alfvén waves are confined to a frequency range that is narrower than in the cold case). It is also found that the Alfvén speed decreases with temperature, being zero for infinite temperature. We have also studied the same system, but based on the relativistic Vlasov equation, to include thermal effects along the direction of propagation. It turns out that kinetic and fluid results are qualitatively consistent, with several quantitative differences. Regarding the electromagnetic branch, the effective plasma frequency is always larger in the kinetic model. Thus, kinetic effects reduce the transparency of the plasma. As to the Alfvén branch, there is a critical, nonzero value of the temperature at which the Alfvén speed is zero. For temperatures above this critical value, the Alfvén branch is suppressed; however, if the background magnetic field increases, then Alfvén waves can propagate for larger temperatures. There are at least two ways in which the above results can be improved. First, nonlinear decays of the electromagnetic wave have been neglected; second, the kinetic treatment considers thermal effects only along the direction of propagation. We have approached the first subject by studying the parametric decays of the exact wave solution found in the context of fluid theory. The dispersion relation of the decays has been solved, showing several resonant and nonresonant instabilities whose dependence on the wave amplitude and plasma temperature has been studied systematically. Regarding the second subject, we are currently performing numerical 1-D particle in cell simulations, a work that is still in progress, although preliminary results are consistent with the analytical ones.

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7

Brodin, G., i L. Stenflo. "Three-wave coupling coefficients for magnetized plasmas with pressure anisotropy". Journal of Plasma Physics 41, nr 1 (luty 1989): 199–208. http://dx.doi.org/10.1017/s0022377800013763.

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In order to find the equations for the nonlinear energy exchange between low-frequency waves in magnetized plasmas in the presence of pressure anisotropy, we start from the Chew–Goldberger–Low equations, the isothermal MHD equations, as well as a new hybrid system of equations. The coupling coefficients describing the interaction between two Alfvén waves and one magnetosonic wave as well as the interaction between two magnetosonic waves and one Alfvén wave are deduced.

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8

MELROSE, D. B., M. E. GEDALIN, M. P. KENNETT i C. S. FLETCHER. "Dispersion in an intrinsically relativistic, one-dimensional, strongly magnetized pair plasma". Journal of Plasma Physics 62, nr 2 (sierpień 1999): 233–48. http://dx.doi.org/10.1017/s0022377899007795.

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The properties of a relativistic plasma dispersion function (RPDF) for an intrinsically extremely relativist, strongly magnetized, one-dimensional, electron–positron plasma are discussed in detail. For a plasma with a mean Lorentz factor 〈γ〉 [Gt ] 1 in its rest frame, the RPDF has a large peak >〈γ〉 at a phase speed a fraction of order 1/〈γ〉 below the speed of light, and the asymptotic value (infinite phase speed) is 〈γ−3〉 ∼ 1/〈γ〉. These features are not particularly sensitive to the choice of distribution function. The RPDF is used to discuss the properties of waves in such plasmas. Particular points discussed are the implications of the RPDF for the maximum frequency for parallel Langmuir waves, and for the reconnection between the Langmuir mode and the Alfvén mode.

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9

Berezutsky, A. G., V. N. Tishchenko, A. A. Chibranov, I. B. Miroshnichenko, Yu P. Zakharov i I. F. Shaikhislamov. "Controlling the type and intensity of low-frequency waves generated by laser plasma clots in a force tube of magnetized plasma". Journal of Physics: Conference Series 2067, nr 1 (1.11.2021): 012019. http://dx.doi.org/10.1088/1742-6596/2067/1/012019.

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Abstract In this work, we study the influence of the parameters of a magnetized background plasma on the intensity of whistler waves generated by periodic laser plasma bunches in a magnetic field tube. It is shown that at 0.3 < Lpi > 0.4 Alfvén waves and whistlers are generated. In the region Lpi> 0.5, intense whistlers with an amplitude of δBmax / B0 ∼ 0.24 are generated.

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10

Cramer, N. F., i S. V. Vladimirov. "Alfvén surface waves in a magnetized dusty plasma". Physics of Plasmas 3, nr 12 (grudzień 1996): 4740–47. http://dx.doi.org/10.1063/1.872041.

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Rozprawy doktorskie na temat "Alfven waves-Magnetized plasmas"

1

Goyal, Ravinder. "Linear and nonlinear propagation of kinetic alfven waves in magnetized plasmas". Thesis, IIT Delhi, 2016. http://localhost:8080/xmlui/handle/12345678/7079.

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Lee, Bo Ram Verfasser], Dieter [Akademischer Betreuer] [Hoffmann i Christoph [Akademischer Betreuer] Niemann. "Study of a laser generated diamagnetic cavity and Alfvén waves in a large magnetized plasma / Bo Ram Lee. Betreuer: Dieter H. H. Hoffmann ; Christoph Niemann". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://d-nb.info/1112044752/34.

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Lee, Bo Ram [Verfasser], Dieter [Akademischer Betreuer] Hoffmann i Christoph [Akademischer Betreuer] Niemann. "Study of a laser generated diamagnetic cavity and Alfvén waves in a large magnetized plasma / Bo Ram Lee. Betreuer: Dieter H. H. Hoffmann ; Christoph Niemann". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://nbn-resolving.de/urn:nbn:de:tuda-tuprints-52112.

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Lee, Bo Ram. "Study of a laser generated diamagnetic cavity and Alfvén waves in a large magnetized plasma". Phd thesis, 2015. https://tuprints.ulb.tu-darmstadt.de/5211/1/Diss_ver111_final.pdf.

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Dense plasma expansion into a tenuous magnetized background plasma is prevalent in space and astrophysical environments. In the interaction between plasmas with different densities under the influence of the magnetic field, various hydromagnetic waves are generated including the magnetized collisionless shocks which are believed to be the source of high energy particles, such as galactic cosmic rays from supernova remnants. Despite its importance in astrophysics and the study for longer than five decades, however, details of the shock physics, such as the formation process or the energy dissipation mechanisms are still not fully understood. This work describes experiments carried out at the Large Plasma Device at University of California, Los Angeles, coupled to a kilojoule-laser. When a laser produced dense plasma interacts with a preformed, magnetized background plasma, a diamagnetic cavity is formed which can be pictured as a piston driving a collisionless shock. Understanding the micro-physics of generated diamagnetic cavities is crucial since it is observed in many magnetized plasmas with applied magnetic field and there are still a number of questions to be answered. In a series of experiments performed at different plasma parameters, magnetic flux probes and electron emissive probes are used to diagnose the structure of the diamagnetic cavity perpendicular to the magnetic field, especially at its edge where the collisionless coupling between the debris and ambient plasma takes place. In contrast to lower laser energy, a strong coupling to ambient ions could be observed depending on the background magnetic field although the energy conversion efficiency from the laser to the cavity stayed on the same order of magnitude. A rise of the radial electric field at the cavity edge was detected, which might be a direct evidence for the laminar coupling mechanism between debris and ambient plasmas without any collisional effects. Large fluctuations in the magnetic and electric field measurements in front of the cavity edge, which were also seen in the experimental observations, are assumed to be instabilities causing energy dissipation and the short cavity lifetime which is almost three orders of magnitude shorter than the theoretically derived classical diffusion time. Along the plasma column, soliton-like Alfv\'en waves were detected which might result from the nonlinear interaction between energetic electrons generated at the cavity edge and the surrounding magnetized plasma. Here, a better energy conversion efficiency from the laser to the Alfv\'en waves has been calculated. Finally, the experimental results are compared to two-dimensional hybrid simulations. The observed ion dynamics as well as large fluctuations in the electric field measurements at the cavity edge could be reproduced. An additional study was done on the effect of the polytropic coefficient in the electron temperature equation in the code and it showed that a nonadiabatic electron temperature increase affects the dynamics of the electric field as well as that of the diamagnetic cavity.

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