Hydromagnetic Resonance in Ionospheric Waves

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

Published Online: 17 MAR 2013

DOI: 10.1029/GM018p0209

The Upper Atmosphere in Motion

The Upper Atmosphere in Motion

How to Cite

Hines, C. O. (1974) Hydromagnetic Resonance in Ionospheric Waves, in The Upper Atmosphere in Motion, American Geophysical Union, Washington, D. C.. doi: 10.1029/GM018p0209

Author Information

  1. Radio Physics Laboratory, Defence Research Board, Ottawa, Canada

Publication History

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

ISBN Information

Print ISBN: 9780875900186

Online ISBN: 9781118663578



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


The characteristics of one class of travelling ionospheric disturbance may be partially explained as the result of an observational selection, in which an atmospheric wave provides the basic disturbance and a hydromagnetic resonance the selection. This resonance occurs when natural modes of electromagnetic oscillation are generated through hydromagnetic coupling with the atmosphere, and it results in an enhanced motion of the ionospheric electrons which are alone observable. The quantitative comparison with observation provides estimates for the specific heat ratio (γ ∼ 1.1) and scale height (C 2g ∼ 20 km), which are lower than the values expected for the F 2-region concerned, but which are nevertheless, possible and certainly valid in order of magnitude.