The Relation Between Hydromagnetic Waves and the Magneto-Ionic Theory†

  1. C. O. Hines
  1. C. O. Hines

Published Online: 17 MAR 2013

DOI: 10.1029/GM018p0862

The Upper Atmosphere in Motion

The Upper Atmosphere in Motion

How to Cite

Hines, C. O. (1974) The Relation Between Hydromagnetic Waves and the Magneto-Ionic Theory†, in The Upper Atmosphere in Motion, American Geophysical Union, Washington, D. C.. doi: 10.1029/GM018p0862

Author Information

  1. Dept. Geophysical Sciences, University of Chicago, Illinois

Publication History

  1. Published Online: 17 MAR 2013
  2. Published Print: 1 JAN 1974

ISBN Information

Print ISBN: 9780875900186

Online ISBN: 9781118663578

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Keywords:

  • Atmosphere, Upper—Addresses, essays, lectures;
  • Dynamic meteorology—Addresses, essays, lectures

Summary

The term “hydromagnetic” is often applied to a variety of waves which in fact fall into quite distinct categories. Among these are the waves treated originally by Alfvén and those studied subsequently by Åström. The physical relationship between all of these waves can be understood readily on the basis of a magneto-ionic approach to the problem, and this approach also clarifies their relationship to radiowaves propagating in ionized gases.

In this paper, the physical relationship is illustrated by means of a step-by-step extension of the equations of charge motion that enter conventional magneto-ionic theory. En route, certain potentially misleading views that are common in hydromagnetic discussions are called into question.