Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201..532l&link_type=abstract
Astrophysical Journal, vol. 201, Oct. 15, 1975, pt. 1, p. 532-543.
Astronomy and Astrophysics
Astrophysics
89
Astronomical Models, Electromagnetic Pulses, Pulse Duration, Scintillation, Turbulence Effects, Astrophysics, Markov Processes, Refracted Waves, Wave Diffraction, Wave Dispersion, Wave Equations, Wave Scattering
Scientific paper
A theory of temporal broadening of pulses propagating in a turbulent medium is developed on the basis of the Markov approximation. The theory may be applied to quite general turbulence spectra and to thin or thick turbulent regions. Since the basis of the theory is the wave equation, no reliance is placed on geometrical optics and no assumptions are made about the scattered angular spectrum. The observed smearing is found to be the combination of three effects: the dispersion effect, the pure refractive effect, and the diffraction effect. The last of these dominates for typical pulsar parameters. Pulse shapes are calculated for both Gaussian and Kolmogorov turbulence spectra and it is shown how these scale with the various turbulence parameters.
Jokipii Randy J.
Lee Clarence L.
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