Diagnosis of Spatial Plasmas with a Relaxation Sounder

  • Jacqueline Etcheto
Part of the Astrophysics and Space Science Library book series (ASSL, volume 57)


Study of waves with low group velocities has allowed us to make a detailed interpretation of the signals reflected back from a plasma excited by a relaxation sounder. Study of the frequency and amplitude development of these waves in the vicinity of the characteristic frequencies of the medium (gyrofrequency and harmonics, upper hybrid frequency and plasma frequency) leads to determination of such plasma parameters as modulus of magnetic field, electron density, and temperature. Results obtained by this means from three rocket experiments launched under differing ionospheric conditions are presented. Similar experiments will be flown aboard GEOS and ISEE-A and the interpretative techniques described here will enable us to determine the characteristics of the plasma surrounding the spacecraft.


Group Velocity Plasma Frequency Beat Frequency Plasma Resonance Index Curve 
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Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1976

Authors and Affiliations

  • Jacqueline Etcheto
    • 1
  1. 1.Centre de Recherche en Physique de l’Environnement Terrestre et Planétaire (CNET-CNRS)Issy-les-MoulineauxFrance

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