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Beam instabilities in the strongly magnetized electron-positron plasma of pulsar magnetospheres are considered. We analyze the resonance conditions and estimate the growth rates of the Cherenkov and cyclotron instabilities of the ordinary…

等离子体物理 · 物理学 2009-10-31 Maxim Lyutikov

We study magnetothermal instability in the ionized plasmas including the effects of Ohmic, ambipolar and Hall diffusion. Magnetic field in the single fluid approximation does not allow transverse thermal condensations, however, non-ideal…

太阳与恒星天体物理 · 物理学 2014-11-20 Mohsen Shadmehri , Mohsen Nejad-Asghar , Alireza Khesali

I review recent analytical and numerical advances in the study of non-equilibrium quark-gluon plasma physics. I concentrate on studies of the dynamics of plasmas which are locally anisotropic in momentum space. In contrast to locally…

高能物理 - 唯象学 · 物理学 2008-11-26 Michael Strickland

This paper presents the plasma potential distribution across magnetic field lines in an argon/oxygen plasma created by 13.56 MHz CCRF discharge consisting of a pair of ring electrodes. It is found that the radial plasma density, electron…

等离子体物理 · 物理学 2022-04-12 Pawandeep Singh , Swati , Shantanu Kumar Karkari

Time-dependent cascades of electron-positron pairs are thought to be the main source of plasma in pulsar magnetospheres and a primary ingredient to explain the nature of pulsar radio emission, a longstanding open problem in high-energy…

高能天体物理现象 · 物理学 2022-05-18 Fábio Cruz , Thomas Grismayer , Simon Iteanu , Paolo Tortone , Luis O. Silva

The physics of the pulsar inner magnetosphere remains poorly constrained by observations. Although about 2000 pulsars have been discovered to date, little is known about their emission mechanism. Large vacuum gaps probably exist and a…

天体物理学 · 物理学 2009-11-11 J. Petri

The electron beam-plasma system is ubiquitous in the space plasma environment. Here, using a Darwin particle-in-cell method, the excitation of electrostatic and whistler instabilities by a gyrating electron beam is studied in support of…

等离子体物理 · 物理学 2018-12-31 Xin An , Jacob Bortnik , Bart Van Compernolle , Viktor Decyk , Richard Thorne

New plasma mechanism for the generation of toroidal magnetic field in the magnetosphere of Crab pulsar is presented. It is based on the development of two-stream instability in the relativistic electron-positron plasma of the pulsar…

星系天体物理 · 物理学 2011-10-04 Irakli S. Nanobashvili

We consider the electron-positron plasma generation processes in the magnetospheres of magnetars - neutron stars with strong surface magnetic fields, B = 10^(14) - 10^(15) G. We show that the photon splitting in a magnetic field, which is…

天体物理学 · 物理学 2010-12-30 Ya. N. Istomin , D. N. Sobyanin

The high-frequency part of spectrum of electromagnetic waves propagating parallel to the external magnetic field is considered for the macroscopically motionless plasmas with the relativistic temperatures $T\sim m_{e}c^{2}$, where $m_{e}$…

等离子体物理 · 物理学 2023-08-16 Pavel A. Andreev

Following the basic principles of a charge separated pulsar magnetosphere \citep{goldreich1969}, we consider the magnetosphere be stationary in space, instead of corotating, and the electric field be uploaded from the potential distribution…

高能天体物理现象 · 物理学 2015-07-01 K. H. Tsui

A magnetic field was recently shown to enhance field-parallel heat conduction in a strongly correlated plasma whereas cross-field conduction is reduced. Here we show that in such plasmas, the magnetic field has the additional effect of…

等离子体物理 · 物理学 2017-01-25 T. Ott , M. Bonitz , P. Hartmann , Z. Donkó

We present a comprehensive investigation of the radio polarization properties within the theory of natural electromagnetic wave modes in pulsar magnetospheres. Taking into account the curvature of the field lines, aberration effects and…

天体物理学 · 物理学 2007-05-23 Alexis von Hoensbroech , Harald Lesch , Thomas Kunzl

We study the frequency of the plasma oscillations of electron-positron pairs created by the vacuum polarization in an uniform electric field with strength E in the range 0.2 Ec < E < 10 Ec. Following the approach adopted in [1] we work out…

等离子体物理 · 物理学 2011-03-23 A. Benedetti , W. -B. Han , R. Ruffini , G. V. Vereshchagin

With the neutron star rotating under a stationary magnetic field generating unipolar induction, charges are driven to the pulsar surface according to their signs, and are uploaded to the magnetosphere along the magnetic field lines. In the…

高能天体物理现象 · 物理学 2021-12-20 K. H. Tsui

(abridged) The physics of the pulsar magnetosphere remains poorly constrained by observations. Little is known about their emission mechanism. Large vacuum gaps probably exist, and a non-neutral plasma partially fills the neutron star…

天体物理学 · 物理学 2009-11-13 Jerome Petri

The expansion of a charge-neutral cloud of electrons and positrons with the temperature 1 MeV into an unmagnetized ambient plasma is examined with a 2D particle-in-cell (PIC) simulation. The pair outflow drives solitary waves in the ambient…

高能天体物理现象 · 物理学 2018-08-01 ME Dieckmann , A Alejo , G Sarri

Thermal instability in an electron-ion magnetized plasma, which is relevant in the intragalactic medium (IGM) of galaxy clusters, solar corona, and other two-component plasma objects is investigated. We apply the multicomponent plasma…

星系天体物理 · 物理学 2015-05-28 Anatoly K. Nekrasov

Electron-positron pair cascades developed in the extreme electromagnetic fields of neutron star polar caps are considered a key source of magnetospheric plasma in these objects. We use a simplified model that maps the Quantum…

高能天体物理现象 · 物理学 2021-03-03 Fábio Cruz , Thomas Grismayer , Luis O. Silva

We consider the voltage structure in the open-field circuit and outer magnetosphere of a magnetar. The standard polar-cap model for radio pulsars is modified significantly when the polar magnetic field exceeds 1.8x10^{14} G. Pairs are…

天体物理学 · 物理学 2009-11-13 Christopher Thompson