Other
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244...68r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, May 1, 1990, p. 68-75.
Other
34
Crab Nebula, Interstellar Matter, Pulsars, Scintillation, Astronomical Spectroscopy, Electron Density (Concentration), Plasma Turbulence, Refractivity
Scientific paper
New measurements of the slow amplitude variations of the Crab pulsar at 610 MHz are presented. Both the rms depth of variation and the typical time-scale confirm the interpretation that the variability is not intrinsic but is refractive interstellar scintillation. By combining these results with earlier pulsar measurements, it is concluded that the spectrum of the interstellar electron density is not as steep a power-law function of wavenumber as has sometimes been proposed. It is, however, consistent with a Kolmogorov spectrum, modified by an inner scale in the region of 10 to the 9th m (or with a variety of other models in which the ratio of power at the typical 'diffractive wavenumber' and 'refractive wavenumber' is somewhat enhanced over that in the Kolmogorov spectrum). The physical significance lies in supporting the notion of interstellar plasma turbulence, with a possible dissipation scale.
Lyne Andrew G.
Rickett Barney J.
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