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On the Scattering and Absorption of Electromagnetic Radiation within Pulsar Magnetospheres

Blandford, R. D. and Scharlemann, E. T. (1976) On the Scattering and Absorption of Electromagnetic Radiation within Pulsar Magnetospheres. Monthly Notices of the Royal Astronomical Society, 174 (1). pp. 59-85. ISSN 0035-8711. doi:10.1093/mnras/174.1.59.

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The scattering and absorption of coherent radio emission by ultra-relativistic particles streaming outwards along the open field lines of a pulsar magnetosphere are investigated for incident frequencies in the guiding-centre frame less than or comparable with the particle gyrofrequency, ω_G. Two scattering regimes are isolated in which the dominant particle oscillations are parallel and perpendicular to the magnetic field, and both spontaneous and induced scattering processes are considered. For the former (longitudinal) regime, a quantum-electrodynamical calculation of the cross-section correct to first order in (ħω/mc^2) is also presented. In addition, cyclotron absorption of radio photons and their subsequent re-emission are investigated. On the basis of these calculations, it is concluded that: (i) induced scattering processes can influence the spectrum and polarization of the radio pulses if they are emitted well within the pulsar magnetosphere, (ii) neither spontaneous scattering nor small-pitch-angle synchrotron emission seems to provide a satisfactory explanation for the optical pulses from NP 0532, (iii) the avoidance of cyclotron absorption imposes important constraints on models of the radio emission process, and (iv) resonant scattering of thermal radiation from the neutron star surface is probably not an important effect.

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Blandford, R. D.0000-0002-1854-5506
Additional Information:© 1976 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. (Received 1975 July 10; in original form 1975 May 2) We thank M. Elitzur, P. Goldreich, J. Katz, M. Rees and M. Ruderman for helpful discussions and correspondence. RB thanks the Institute for Advanced Study, Princeton, for hospitality and support (under National Science Foundation, Grant No. NSF GP-40768X) during the completion of this work.
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Official Citation:R. D. Blandford, E. T. Scharlemann, On the Scattering and Absorption of Electromagnetic Radiation within Pulsar Magnetospheres, Monthly Notices of the Royal Astronomical Society, Volume 174, Issue 1, 1 January 1976, Pages 59–85,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95675
Deposited By: George Porter
Deposited On:22 May 2019 22:50
Last Modified:16 Nov 2021 17:14

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