On the passage of radiation through inhomogeneous, moving media. XII - Polarized waves in a plane, sheared medium

Details On the passage of radiation through inhomogeneous, moving media. XII - Polarized waves in a plane, sheared medium On the passage of radiation through inhomogeneous, moving media. XII - Polarized waves in a plane, sheared medium

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...198..477l&link_type=abstract

Astrophysical Journal, vol. 198, June 1, 1975, pt. 1, p. 477-484.

Astronomy and Astrophysics

Astrophysics

9

Polarized Electromagnetic Radiation, Pulsar Magnetospheres, Pulsars, Stellar Atmospheres, Wave Propagation, Astronomical Models, Maxwell Equation, Radiative Transfer, Ray Tracing

Scientific paper

Using the complete set of Maxwell equations, the ray paths and Stokes parameters of a polarized wave are followed which passes through a slab of differentially shearing material of variable refractive index. The polarization state of the signal leaving the top of the slab is related to the polarization state of the initial wave. In general, the two are not the same. These calculations were made to illustrate the point that the polarization properties of observed pulsar signals may be very different from those of the emitted signals due to propagation effects in the differentially shearing magnetospheres that most pulsars are believed to possess. While it is recognized that the precise amount of polarization variations is model dependent, the calculations show that even for simple situations a noticeable polarization variation occurs. Accordingly, the calculations reported here are an educative device: they show that it is, perhaps, unwise to assume that the observed polarization properties of pulsar signals are the same as the emitted signals.

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