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Comment on a paper of I. Lerche: Effect of interstellar density fluctuations on signal dispersion measure

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Abstract

The transit time of a pulsar signal is influenced by the density fluctuations of the interstellar plasma. This effect is calculated in the one-dimensional and spherically symmetrical case, using a WKB-type approximation for the transverse electric field. The influence is found to be small compared to Lerche's result, and the difference is explained by the fact that Lerche's formula refers to a ‘mean signal’.

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References

  • Batchelor, G. K.: 1959,The Theory of Homogeneous Turbulence, Cambridge, p. 47.

  • Ellis, G. R. A. and Hamilton, P. A.: 1966,Astrophys. J.:146, 78.

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  • Lerche, I.: 1970,Astrophys. Space Sci 6, 287–292.

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Authors and Affiliations

  1. Max-Planck-Institut für Physik und Astrophysik, München, Germany

    K. Elsässer

  2. Institut für Plasmaphysik, Garching/München, Germany

    P. Gräff

Authors
  1. K. Elsässer
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  2. P. Gräff
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Additional information

This work has been undertaken as part of the joint research programme of the Institut für Plasmaphysik and Euratom.

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Elsässer, K., Gräff, P. Comment on a paper of I. Lerche: Effect of interstellar density fluctuations on signal dispersion measure. Astrophys Space Sci 8, 204–206 (1970). https://doi.org/10.1007/BF00650881

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  • DOI: https://doi.org/10.1007/BF00650881

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