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Chemical Effects of Shear Alfvén Waves in Molecular Clouds

Published online by Cambridge University Press:  07 August 2017

S.B. Charnley  and
W.G. Roberge
S.B. Charnley
Affiliation:
Space Science Division, NASA Ames Research Center, California 94035. Physics Department, Rensselaer Polytechnic Institute, New York 12180.
W.G. Roberge
Affiliation:
Physics Department, Rensselaer Polytechnic Institute, New York 12180.

Abstract

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We consider the propagation of low-amplitude MHD waves in partially-ionised plasmas. Ion-neutral drift (ambipolar diffusion) can lead to significant variations in the deuterium fractionation ratios of several molecules (e.g. HCO+ and N2H+) on spatial scales of between a few hundredths and a few tenths of a parsec, depending upon the fractional ionisation of the plasma. It is possible that interstellar Alfvén waves could be detected by molecular spectroscopy and that these waves may produce other small-scale abundance gradients in molecular clouds.

Type
Diffuse, Translucent and High-Latitude Clouds
Information
Symposium - International Astronomical Union , Volume 150: Astrochemistry of Cosmic Phenomena , 1992 , pp. 155 - 156
Copyright
Copyright © Kluwer 1992 

References

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