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Intermittency and Anisotropy in the Ionized Interstellar Medium

Published online by Cambridge University Press:  04 June 2018

Barney Rickett
Barney Rickett*
Affiliation:
Dept. of Electrical & Computer Engineering, University of California San Diego, La Jolla, CA 92093, USA email: bjrickett@ucsd.edu
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Abstract

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The discovery of pulsars was closely followed by the discovery of dispersion and scattering in the interstellar plasma (ionized interstellar medium - IISM). The rich phenomena of scattering and scintillation have since been successfully modelled as propagation through a statistically uniform plasma turbulence with an isotropic Kolmogorov spectrum of density. However, this enticingly simple model fails to explain the many recent observations, that show anisotropic scattering from highly localized regions of the IISM often referred to as phase screens. I summarize the recent evidence from pulsars and also from very compact AGN sources, which can exhibit rapid scintillation and occasionally ESEs. The unknown astrophysical origin of these phenomena includes thin current sheets, the diffuse remnants of old supernova shells, and plasma filaments surrounding ubiquitous molecular clumps near young hot stars.

Keywords

pulsars: generalISM: structurescattering
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S337: Pulsar Astrophysics the Next Fifty Years , September 2017 , pp. 283 - 286
Copyright
Copyright © International Astronomical Union 2018 

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