Interstellar Weather -- Radio Wave Propagation Through the Turbulent Ionized Interstellar Medium

Details Interstellar Weather -- Radio Wave Propagation Through the Turbulent Ionized Interstellar Medium Interstellar Weather -- Radio Wave Propagation Through the Turbulent Ionized Interstellar Medium

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.4617b&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #46.17; Bulletin of the American Astronomical Society, Vol. 30, p.1151

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Turbulence, or turbulent-like structures, in the interstellar medium when combined with motions of the medium and the pulsar-Earth line of sight lead to observable changes in pulse arrival time via both dispersion measure changes and multipath propagation or pulse broadening. In the Crab (PSR B0531+21) and Vela (PSR B0833-45) pulsars the column density variations are dominated by structures within the high-density material associated with the surrounding supernova remnants and pre-stellar matter. The Crab pulsar propagation parameters have been particularly disturbed during the past two years -- including a dispersion measure ``glitch'' with an amplitude of 0.1 pc cm(-3) in 1997 October. In the millisecond pulsar B1937+21 variable propagation effects are much smaller and are associated with the general intervening interstellar medium. Daily monitoring with small telescopes at NRAO Green Bank and at Jodrell Bank allow detailed inspection of the development of these propagation effects. We learn about structures in thermal plasma, ``interstellar weather'' along the line of sight, and can assess the impact of these effects on less frequently sampled precision timing programs.

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