Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-26T04:26:50.397Z Has data issue: false hasContentIssue false

Signatures of Polar-cap Current Flow in Polarization Angle Sweeps

Published online by Cambridge University Press:  12 April 2016

Johann A. Hibschman
Affiliation:
University of California, Berkeley. 601 Campbell Hall, Berkeley94720-3411.
Jonathan Arons
Affiliation:
University of California, Berkeley. 601 Campbell Hall, Berkeley94720-3411.

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Upon re-examining the characteristic polarization angle sweep of rotation-powered pulsars, we find that the sweep is perceptibly shifted by aberrational effects and by polar-cap current flow. In addition to the previously known phase shift of the entire sweep by ΔΦ = −4r/RL, aberration shifts the polarization angle itself by ΔΨ = −(10/3)(r/RL) cos α. Similarly, current flow above the polar cap shifts the polarization sweep by ΔΨ = (10/3)(r/RL)(J/JGJ) COS α, potentially providing a method of directly measuring the magnitude of the current. The competition between these two effects produces a potentially observable signature in the polarization angle sweep.

Type
Part 3. Studies of Radio Emission
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Blaskiewicz, M., Cordes, J.M., & Wasserman, I. 1991, ApJ, 370, 643 Google Scholar
Radhakrishnan, V., & Cooke, D.J. 1969, Astrophys. Lett., 3, 225 Google Scholar