Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (499) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
· Translate This Page
Pair formation above pulsar polar caps - Structure of the low altitude acceleration zone
Arons, J.; Scharlemann, E. T.
AA(California, University, Berkeley, Calif.), AB(Columbia, University, New York, N.Y.)
Astrophysical Journal, Part 1, vol. 231, Aug. 1, 1979, p. 854-879. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Electron Beams, Magnetohydrodynamic Flow, Polar Caps, Pulsars, X Ray Sources, Gamma Rays, Magnetic Dipoles, Magnetohydrodynamics, Plasma Diodes, Poisson Equation, Steady Flow
Bibliographic Code:


Solutions are presented for a steady space-charge-limited flow of an electron beam above the polar cap of a pulsar in the case where the vector product of the neutron star's angular velocity and surface magnetic field is greater than zero over the whole polar-cap region and the flow is shorted out by pair creation. The flow has the characteristics of a space-charge-limited diode, with the stellar surface acting as a cathode and the lower boundary of the pair plasma acting as a conducting anode at a finite height above the surface. Reasons are given for believing that this flow is stable. The minimum photon energy absorbed in the hypothesized magnetic-field structure is computed and used to calculate the maximum period for pair creation in a dipole field. The maximum period for pair creation in more compex geometries is also estimated. It is shown that the dynamical structure of the plasma layer at the anode surface is such as to lead to a small reversed positron flux. Implications of this theory for understanding and predicting pulsar observations are discussed.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences

More Article Retrieval Options

HELP for Article Retrieval

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

Find Similar Abstracts:

Use: Authors
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
arXiv e-prints