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Signatures of Polar-cap Current Flow in Polarization Angle Sweeps

Published online by Cambridge University Press:  12 April 2016

Johann A. Hibschman  and
Jonathan Arons
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

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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
Information
International Astronomical Union Colloquium , Volume 177: Pulsar Astronomy - 2000 and Beyond , 2000 , pp. 253 - 256
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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