Plasma processes in pulsar magnetospheres and eclipsing binary pulsar systems

Luo, Quantian

doi:10.1590/s0103-97331998000300004

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…The nonlinear electrostatic spiky structures studied here may have important implications for pulsars radiation and their microstructure. Firstly, these ESW can modulate the pulsar electromagnetic radiation with a periodicity of (varying from 1 to 5 times the cyclotron period) leading to some microstructures via modulational instabilities (Hasegawa 1975; Luo 1998). These fine structures could have a constant .…”

Section: Discussionmentioning

confidence: 99%

Nonlinear electrostatic solitary waves in electron–positron plasmas

et al. 2016

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The generation of nonlinear electrostatic solitary waves (ESWs) is explored in a magnetized four component two-temperature electron–positron plasma. Fluid theory is used to derive a set of nonlinear equations for the ESWs, which propagate obliquely to an external magnetic field. The electric field structures are examined for various plasma parameters and are shown to yield sinusoidal, sawtooth and bipolar waveforms. It is found that an increase in the densities of the electrons and positrons strengthen the nonlinearity while the periodicity and nonlinearity of the wave increases as the cool-to-hot temperature ratio increases. Our results could be useful in understanding nonlinear propagation of waves in astrophysical environments and related laboratory experiments.

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Section: Discussionmentioning

confidence: 99%

Nonlinear electrostatic solitary waves in electron–positron plasmas

et al. 2016

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“…Although the BEN observations in the pulsar magnetosphere have not been reported, the electronacoustic mode can play important role there. Firstly, it can modulate the pulsar electromagnetic radiation during their passage through the pulsar magnetosphere leading to modulational instability (Hasegawa 1975;Luo 1998). This would explain some features of microstructure in pulsar radiation.…”

Section: Discussionmentioning

confidence: 99%

“…This would explain some features of microstructure in pulsar radiation. Secondly, the coupling of electron-acoustic wave with an electromagnetic wave may produce, depending upon the beat conditions, higher or lower frequency electromagnetic waves by three-wave interaction process (Luo 1998).…”

Section: Discussionmentioning

confidence: 99%

Linear electrostatic waves in two-temperature electron–positron plasmas

et al. 2012

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Linear electrostatic waves in a magnetized four-component, two-temperature electron–positron plasma are investigated, with the hot species having the Boltzmann density distribution and the dynamics of cooler species governed by fluid equations with finite temperatures. A linear dispersion relation for electrostatic waves is derived for the model and analyzed for different wave modes. Analysis of the dispersion relation for perpendicular wave propagation yields a cyclotron mode with contributions from both cooler and hot species, which in the absence of hot species goes over to the upper hybrid mode of cooler species. For parallel propagation, both electron-acoustic and electron plasma modes are obtained, whereas for a single-temperature electron–positron plasma, only electron plasma mode can exist. Dispersion characteristics of these modes at different propagation angles are studied numerically.

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“…We note that the magnitude of the observed DM variations, 8.5×10 −3 cm −3 pc, would in principle allow for such a possibility. Previous work, for instance, by Wu & Chian (1995) or Luo (1998), have proposed that DM variations arising from non-linearities in the pulsar magnetosphere may lead to a strong dependence between radio luminosity and DM fluctuations. Since we do not find any correlation between single-pulse DM estimates and S/N and that the observed arrival time variations do not show 𝜈 −2 scaling, the argument for a dispersive origin for the frequency dependent variations is not strongly supported.…”

Section: Limits On Dm Measurements In Psr J0437-4715mentioning

confidence: 99%

Measurements of pulse jitter and single-pulse variability in millisecond pulsars using MeerKAT

Parthasarathy,

Bailes,

Shannon

et al. 2021

Preprint

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Using the state-of-the-art SKA precursor, the MeerKAT radio telescope, we explore the limits to precision pulsar timing of millisecond pulsars achievable due to pulse stochasticity (jitter). We report new jitter measurements in 15 of the 29 pulsars in our sample and find that the levels of jitter can vary dramatically between them. For some, like the 2.2 ms pulsar PSR J2241-5236, we measure an implied jitter of just ∼ 4 ns/hr, while others like the 3.9 ms PSR J0636-3044 are limited to ∼ 100 ns/hr. While it is well known that jitter plays a central role to limiting the precision measurements of arrival times for high signal-to-noise ratio observations, its role in the measurement of dispersion measure (DM) has not been reported, particularly in broad-band observations. Using the exceptional sensitivity of MeerKAT, we explored this on the bright millisecond pulsar PSR J0437-4715 by exploring the DM of literally every pulse. We found that the derived single pulse DMs vary by typically 0.0085 cm −3 pc from the mean, and that the best DM estimate is limited by the differential pulse jitter across the band. We postulate that all millisecond pulsars will have their own limit on DM precision which can only be overcome with longer integrations. Using high-time resolution filterbank data of 9 𝜇s, we also present a statistical analysis of single pulse phenomenology. Finally, we discuss optimization strategies for the MeerKAT pulsar timing program and its role in the context of the International Pulsar Timing Array (IPTA).

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Plasma processes in pulsar magnetospheres and eclipsing binary pulsar systems

Cited by 6 publications

References 14 publications

Nonlinear electrostatic solitary waves in electron–positron plasmas

Nonlinear electrostatic solitary waves in electron–positron plasmas

Linear electrostatic waves in two-temperature electron–positron plasmas

Measurements of pulse jitter and single-pulse variability in millisecond pulsars using MeerKAT

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