Particle Acceleration Zones above Pulsar Polar Caps: Electron and Positron Pair Formation Fronts

1998 ◽  
Vol 508 (1) ◽  
pp. 328-346 ◽  
Author(s):  
Alice K. Harding ◽  
Alexander G. Muslimov
Keyword(s):  
Particle Acceleration ◽  
Pair Formation ◽  
Polar Caps

Condensed Surfaces of Magnetic Neutron Stars and Particle Acceleration Above Pulsar Polar Caps

2008 ◽  
Author(s):  
Zach Medin ◽  
Dong Lai ◽  
C. Bassa ◽  
Z. Wang ◽  
A. Cumming ◽  
...  
Keyword(s):  
Particle Acceleration ◽  
Neutron Stars ◽  
Polar Caps

scholarly journals Hybrid numerical simulations of pulsar magnetospheres

2019 ◽  
Vol 491 (4) ◽  
pp. 5579-5585 ◽  
Author(s):  
Ioannis Contopoulos ◽  
Jerome Pétri ◽  
Petros Stefanou
Keyword(s):  
Particle Acceleration ◽  
Current Sheet ◽  
Electric Current ◽  
Hybrid Approach ◽  
High Energy ◽  
Basic Premise ◽  
Analytic Approximations ◽  
Polar Caps ◽  
Electron Positron ◽  
Field Lines

ABSTRACT We continue our investigation of particle acceleration in the pulsar equatorial current sheet (ECS). Our basic premise has been that the charge carriers in the current sheet originate in the polar caps as electron–positron pairs, and are carried along field lines that enter the ECS beyond the magnetospheric Y-point. In this work, we investigate further the charge replenishment of the ECS. We discovered that the flow of pairs from the rims of the polar caps cannot supply both the electric charge and the electric current of the ECS. The ECS must contain an extra amount of positronic (or electronic depending on orientation) electric current that originates in the stellar surface and flows outwards along the separatrices. We develop an iterative hybrid approach that self-consistently combines ideal force-free electrodynamics in the bulk of the magnetosphere with particle acceleration along the ECS. We derive analytic approximations for the orbits of the particles, and obtain the structure of the pulsar magnetosphere for various values of the pair formation multiplicity parameter κ. For realistic values κ ≫ 1, the magnetosphere is practically indistinguishable from the ideal force-free one, and therefore, the calculation of the spectrum of high energy radiation must rely on analytic approximations for the distribution of the accelerating electric field in the ECS.

Particle acceleration and radio emission above pulsar polar caps

1980 ◽  
Vol 235 ◽  
pp. 576 ◽  
Author(s):  
A. F. Cheng ◽  
M. A. Ruderman
Keyword(s):  
Particle Acceleration ◽  
Radio Emission ◽  
Polar Caps

scholarly journals Pulsar Emission Physics: The First Fifty Years

2017 ◽  
Vol 13 (S337) ◽  
pp. 52-57 ◽  
Author(s):  
Alice K. Harding
Keyword(s):  
Particle Acceleration ◽  
High Energy ◽  
Pulsar Emission ◽  
High Energy Radiation ◽  
Energy Radiation ◽  
High Energies ◽  
Polar Caps ◽  
History Of ◽  
Emission Models ◽  
High Energy Emission

AbstractOver the last fifty years since the discovery of pulsars, our understanding of where and how pulsars emit the radiation we observe has undergone significant revision. The location and mechanisms of high-energy radiation are intimately tied to the sites of particle acceleration. The evolution of emission models has paralleled the development of increasingly more sensitive telescopes, especially at high energies. I will review the history of pulsar emission modeling, from the early days of gaps at the polar caps, to outer gaps and slot gaps in the outer magnetosphere, to the present era of global magnetosphere simulations that locate most acceleration and high-energy emission in the current sheets.

Collective Methods of Particle Acceleration in a Plasma and in Heavy-Current Electron Beams

1972 ◽  
Vol 107 (6) ◽  
pp. 326
Author(s):  
A.A. Kolomenskii ◽  
M.S. Rabinovich ◽  
Ya.B. Fainberg
Keyword(s):  
Particle Acceleration ◽  
Electron Beams ◽  
Current Electron
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