scholarly journals Plasma Fluctuations Could Generate Bright Pulsar Emission

Physics ◽  
2020 ◽  
Vol 13 ◽  
Author(s):  
Alice K. Harding
Keyword(s):  
Pulsar Emission ◽  
Plasma Fluctuations

scholarly journals A statistical analysis of the nulling pulsar population

2021 ◽  
Vol 502 (4) ◽  
pp. 4669-4679
Author(s):  
Sofia Z Sheikh ◽  
Mariah G MacDonald
Keyword(s):  
Statistical Analysis ◽  
Pulse Width ◽  
Local Minimum ◽  
Broad Band ◽  
Selection Effects ◽  
Clustering Methods ◽  
Pulsar Emission ◽  
Spin Period ◽  
Null State ◽  
Linear Correlations

ABSTRACT Approximately 8 per cent of the ∼2800 known pulsars exhibit ‘nulling,’ a temporary broad-band cessation of normal pulsar emission. Nulling behaviour can be coarsely quantified by the nulling fraction, which describes the percentage of time a given pulsar will be found in a null state. In this paper, we perform the most thorough statistical analysis thus far of the properties of 141 known nulling pulsars. We find weak, non-linear correlations between nulling fraction and pulse width, as well as nulling fraction and spin period which could be attributed to selection effects. We also further investigate a recently hypothesized gap at 40 per cent nulling fraction. While a local minimum does exist in the distribution, we cannot confirm a consistent and unique break in the distribution when we investigate with univariate and multivariate clustering methods, nor can we prove the existence of two statistically distinct populations about this minimum. Using the same methods, we find that nulling pulsars are a statistically different population from normal, radio, non-nulling pulsars, which has never been quantitatively verified. In addition, we summarize the findings of the prior nulling pulsar statistics literature, which are notoriously contradictory. This study, in context, furthers the idea that nulling fraction alone does not contain enough information to describe the behaviour of a nulling pulsar and that other parameters such as null lengths and null randomness, in addition to a better understanding of selection effects, are required to fully understand this phenomenon.

Plasma fluctuations at critical density in a CO2 laser plasma interaction

1982 ◽  
Vol 25 (12) ◽  
pp. 2326 ◽  
Author(s):  
C. J. Walsh
Keyword(s):  
Co2 Laser ◽  
Laser Plasma ◽  
Critical Density ◽  
Plasma Fluctuations ◽  
Plasma Interaction ◽  
Laser Plasma Interaction

Polarization-mode separation and the emission geometry of pulsar 0823 + 26: A new pattern of pulsar emission?

1995 ◽  
Vol 16 (3-4) ◽  
pp. 327-355 ◽  
Author(s):  
Joanna M. Rankin ◽  
N. Rathnasree
Keyword(s):  
Polarization Mode ◽  
Pulsar Emission ◽  
Mode Separation

scholarly journals TOWARD AN EMPIRICAL THEORY OF PULSAR EMISSION. X. ON THE PRECURSOR AND POSTCURSOR EMISSION

2015 ◽  
Vol 798 (2) ◽  
pp. 105 ◽  
Author(s):  
Rahul Basu ◽  
Dipanjan Mitra ◽  
Joanna M. Rankin
Keyword(s):  
Empirical Theory ◽  
Pulsar Emission

scholarly journals Radio Emission Model of a 'Typical' Pulsar

1987 ◽  
Vol 40 (6) ◽  
pp. 755 ◽  
Author(s):  
AZ Kazbegi ◽  
GZ Machabeli ◽  
G Melikidze
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Waves ◽  
Emission Model ◽  
Radio Waves ◽  
Resonance Case ◽  
Pulsar Magnetosphere ◽  
Pulsar Emission ◽  
Dipole Magnetic Field ◽  
New Type ◽  
The Magnetic Field

The generation of radio waves in the plasma of the pulsar magnetosphere is considered taking into account the inhomogeneity of the dipole magnetic field. It is shown that the growth rate of the instability of the electromagnetic waves calculated in the non-resonance case turns out to be of the order of 1/ TO (where TO is the time of plasma escape from the light cylinder). However, the generation of electromagnetic waves from a new type Cherenkov resonance is possible, occurring when the particles have transverse velocities caused by the drift due to the inhomogeneity of the magnetic field. Estimates show that the development of this type of instability is possible only for pulsars with ages which exceed 104 yr. We make an attempt to explain some peculiarities of 'typical' pulsar emission on the basis of the model developed.

Plasma fluctuations in the magnetosheath downstream from Uranus

1990 ◽  
Vol 95 (A5) ◽  
pp. 6413 ◽  
Author(s):  
John D. Richardson ◽  
Ming Zhang ◽  
John W. Belcher ◽  
George L. Siscoe
Keyword(s):  
Plasma Fluctuations

High Time Resolution Infrared Observations of the Crab Nebula Pulsar and the Pulsar Emission Mechanism

1997 ◽  
Vol 477 (1) ◽  
pp. 465-474 ◽  
Author(s):  
S. S. Eikenberry ◽  
G. G. Fazio ◽  
S. M. Ransom ◽  
J. Middleditch ◽  
J. Kristian ◽  
...  
Keyword(s):  
Time Resolution ◽  
Crab Nebula ◽  
High Time ◽  
High Time Resolution ◽  
Emission Mechanism ◽  
Pulsar Emission ◽  
Infrared Observations ◽  
The Crab Nebula

The Characteristics of Millisecond Pulsar Emission. I. Spectra, Pulse Shapes, and the Beaming Fraction

1998 ◽  
Vol 501 (1) ◽  
pp. 270-285 ◽  
Author(s):  
Michael Kramer ◽  
Kiriaki M. Xilouris ◽  
Duncan R. Lorimer ◽  
Oleg Doroshenko ◽  
Axel Jessner ◽  
...  
Keyword(s):  
Millisecond Pulsar ◽  
Pulsar Emission

Study of plasma fluctuations in the Tuman-3m tokamak using microwave reflectometry with an obliquely incident probing beam

2000 ◽  
Vol 26 (10) ◽  
pp. 813-819 ◽  
Author(s):  
V. V. Bulanin ◽  
S. V. Lebedev ◽  
L. S. Levin ◽  
V. S. Roytershteyn
Keyword(s):  
Plasma Fluctuations ◽  
Obliquely Incident
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