Coupling between electrostatic and electromagnetic behaviour in a cylindrical equal-mass plasma

Diver, D. A.; Costa, A. A. da; Laing, E. W.

doi:10.1051/0004-6361:20020302

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…Relativistic undamped electrostatic oscillations in a pair plasma may be relevant to the pulsar environment, in which electrostatic oscillations are a significant collective effect in the particle dynamics of trapped pairplasmas [15]; these waves can couple to electromagnetic modes, and therefore act as moving sources of coherent radiation. Such a mechanism may offer a new interpretation of drifting subpulses in pulsars, which have been the subject of renewed interest recently [16].…”

Section: Discussionmentioning

confidence: 99%

Relativistic Landau damping of longitudinal waves in isotropic pair plasmas

Laing

Diver

2006

Physics of Plasmas

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Landau damping is described in relativistic electron-positron plasmas. Relativistic electronpositron plasma theory contains important new effects when compared with classical plasmas. For example, there are undamped superluminal wave modes arising from both a continuous and discrete mode structure, the former even in the classical limit. We present here a comprehensive analytical treatment of the general case resulting in a compact and useful form for the dispersion relation. The classical pair-plasma case is addressed, for completeness, in an appendix.

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Section: Discussionmentioning

confidence: 99%

Relativistic Landau damping of longitudinal waves in isotropic pair plasmas

Laing

Diver

2006

Physics of Plasmas

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“…Hence a non-localised, broad-band disturbance of such a plasma would yield many propagating electrostatic waves, and several non-propagating stationary electrostatic oscillations. Given that plasma oscillations can be a source of electromagnetic radiation in pair-plasmas [16,17] it is significant that the spectrum of possible electrostatic modes is more richly structured in the relativistic case than the classical one.…”

Section: E Trapped Modesmentioning

confidence: 99%

Bernstein modes in a weakly relativistic electron-positron plasma

2003

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The form of the propagating electrostatic Bernstein mode in a relativistic electron-positron plasma is markedly different from that in the classical plasma, once the momentum-dependent cyclotron frequency is accounted for in full inside the integrations. Given that particles in different parts of momentum space 'see' a different cyclotron frequency, there is no simple global singularity which reproduces the classical dispersion features.

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“…They consider a wave coupling due to shear velocity of the pair plasma which is less efficient than the wave coupling due to obliquity of the propagation and resonance conditions. Diver et al [22], treat a wave coupling due to gradient of the magnetic field. Their numerical results show the enhancement of the electromagnetic features of the wave.…”

Section: Coupled Waves In the Open Magnetosphere: Wave Field Componen...mentioning

confidence: 99%

Pair plasma in pulsar magnetospheres

Asséo

2003

Plasma Phys. Control. Fusion

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The main features of radiation received from pulsars imply that they are neutron stars which contain an extremely intense magnetic field and emit coherently in the radio domain. Most recent studies attribute the origin of the coherence to plasma instabilities arising in pulsar magnetospheres; they mainly concern the linear, or the nonlinear, character of the involved unstable waves.We briefly introduce radio pulsars and specify physical conditions in pulsar emission regions: geometrical properties, magnetic field, pair creation processes and repartition of relativistic charged particles. We point to the main ingredients of the linear theory, extensively explored since the 1970s: (i) a dispersion relation specific to the pulsar case; (ii) the characteristics of the waves able to propagate in relativistic pulsar plasmas; (iii) the different ways in which a two-humped distribution of particles may arise in a pulsar magnetosphere and favour the development of a two-stream instability.We sum up recent improvements of the linear theory: (i) the determination of a 'coupling function' responsible for high values of the wave field components and electromagnetic energy available; (ii) the obtention of new dispersion relations for actually anisotropic pulsar plasmas with relativistic motions and temperatures; (iii) the interaction between a plasma and a beam, both with relativistic motions and temperatures; (iv) the interpretation of observed 'coral' and 'conal' features, associated with the presence of boundaries and curved magnetic field lines in the emission region; (v) the detailed topology of the magnetic field in the different parts of the emission region and its relation to models recently proposed to interpret drifting subpulses observed from PSR 0943 + 10, showing 20 sub-beams of emission.We relate the nonlinear evolution of the two-stream instability and development of strong turbulence in relativistic pulsar plasmas to the emergence of relativistic solitons, able to form elementary structures for pulsar radiation. We explain how nonlinear interactions between unstable waves and particles provide a canvas to explain 'microstructures' (i.e. fluctuations on the microsecond timescale) observed in individual radio pulses and estimates for the level of electromagnetic energy reliable to pulsar radio emission.

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Coupling between electrostatic and electromagnetic behaviour in a cylindrical equal-mass plasma

Cited by 4 publications

References 9 publications

Relativistic Landau damping of longitudinal waves in isotropic pair plasmas

Relativistic Landau damping of longitudinal waves in isotropic pair plasmas

Bernstein modes in a weakly relativistic electron-positron plasma

Pair plasma in pulsar magnetospheres

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