Propagation in a shearing plasma. II - Turbulence and the frequency range of pulsar microstructure

Details Propagation in a shearing plasma. II - Turbulence and the frequency range of pulsar microstructure Propagation in a shearing plasma. II - Turbulence and the frequency range of pulsar microstructure

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238.1054h&link_type=abstract

Astrophysical Journal, Part 1, vol. 238, June 15, 1980, p. 1054-1065.

Astronomy and Astrophysics

Astrophysics

3

Magnetospheres, Microstructure, Plasma Turbulence, Pulsars, Radiative Transfer, Stellar Structure, Plasma Frequencies, Plasma-Electromagnetic Interaction, Pulsed Radiation, Radio Transmission, Shearing, Stellar Atmospheres, Stellar Models, Stochastic Processes, Transmissivity, Velocity Distribution

Scientific paper

Numerical calculations are presented which explore the propagation of radio waves and pulses through a turbulent shearing plasma. A stochastic model is used to describe the turbulent velocity field, in which random fluctuations are superposed on a mean profile. Both Gaussian wave packets and shot-noise pulses polarized in the plane of shearing acquire quasi-periodic intensity modulations above the rest-frame plasma frequency. The frequency range over which these modulations appear is shown to depend on the spatial correlation length of the turbulent fluctuations and on their standard deviation from the mean velocity. The period of the modulations is variable from one realization of the random process to the next, and the average period is frequency dependent. The results of these calculations lend further support to a model for pulsar microstructure in which periodic micropulses are pure temporal modulations of the emitted radiation due to propagation effects in magnetospheric shearing regions. It is shown that turbulence on a scale of approximately 10 cm can produce these quasi-periodic modulations over a frequency range comparable to that of observed microstructure.

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