Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385..273p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 273-281.
Astronomy and Astrophysics
Astrophysics
56
Cold Plasmas, Interstellar Matter, Plasma Turbulence, Pulsars, Radio Waves, Time Measurement, Frequency Ranges, H Ii Regions, Time Lag, Wave Propagation
Scientific paper
Timing observations of eight pulsars over a frequency range from 25 MHz to 5 GHz are performed in order to investigate possible departures from the nu exp -2 dispersion law that applies to the propagation of radio waves through the tenuous interstellar plasma. Apparent deviations from a cold plasma law were found at high frequencies (2-5 GHz) for two pulsars: PSR 0525 + 21 and PSR 1237 + 25. The absence of LF deviations from a nu exp -2 dispersion law at the 1-ms level is consistent with a Kolmogorov spectrum of the interstellar plasma turbulence extending to scale sizes of about 10 exp 15 cm. Forms of the interstellar dispersion law which included nu exp -3 and nu exp -4 terms arising from clumping, magnetic fields, and temperature effects in the dispersing gas were examined. Pulsar dispersion was found to be an insensitive probe of gas temperature, even for a hot plasma. Dispersion delays varying as nu exp -4 could be detected at decameter wavelengths if the line of sight passes through a dense H II region.
Phillips Adrienne J.
Wolszczan Alex
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