Pulsar polarization fluctuations at 430 MHz with microsecond time resolution

Details Pulsar polarization fluctuations at 430 MHz with microsecond time resolution Pulsar polarization fluctuations at 430 MHz with microsecond time resolution

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..484c&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Dec. 1, 1977, p. 484-503.

Astronomy and Astrophysics

Astrophysics

51

Microwave Emission, Polarization Characteristics, Pulsars, Signal Distortion, Circular Polarization, Cross Coupling, Data Processing, Fast Fourier Transformations, Interstellar Extinction, Ultrahigh Frequencies, Wave Dispersion

Scientific paper

The polarization properties of PSRs 0950+08, 1133+16, 1919+21, and 2016+28 at 430 MHz are studied on the basis of data processed to yield a time resolution of 8 microsec. Distortion caused by interstellar dispersion is removed from the data, Stokes parameters are computed from the dispersion-free signals, average Stokes parameters are calculated by summing the Stokes parameters of individual pulses, and the autocorrelation functions of the Stokes parameters are obtained by fast Fourier transform techniques. The mean Stokes-parameter profiles for each pulsar are evaluated using a model that represents subpulses as unsteady-state stochastic modulations of a steady-state microstructure. It is found that the polarization exhibited in single pulses (i.e., that associated with subpulses or micropulses) can be described as either (1) a slow variation of the polarization state across pulse longitude or (2) occasional rapid transitions of the polarization state between two orthogonal states having opposite senses of circular polarization and position angles separated by 90 deg.

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