Astrophysics and Space Science

, Volume 20, Issue 2, pp 417–429 | Cite as

Wave propagation in the magnetosphere of Jupiter

  • H. B. Liemohn
Article

Abstract

The magnetosphere of Jupiter has been the subject of extensive research in recent years due to its detectable radio emissions. Observations in the decimetric radio band have been particular helpful in ascertaining the general shape of the Jovian magnetic field, which is currently believed to be a dipole with minor perturbations. Although there is no direct evidence for thermal plasma in the magnetosphere of Jupiter, theoretical considerations about the physical processes that must occur in the ionosphere and magnetosphere surrounding Jupiter have lead to estimates of the thermal plasma distribution. These models of the Jovian magnetic field and thermal plasma distribution, specify the characteristic plasma and cyclotron frequencies in the magnetosplasma and thereby provide a basis for estimating thelocal electromagnetic and hydromagnetic noise around Jupiter. Spatial analogs of the well-known Clemmow-Mullaly-Allis (CMA) diagrams have been constructed to identify the loci of electron and ion resonances and cutoffs for the different field and plasma models. Regions of reflection, mode coupling, and probable amplification are readily identified. The corresponding radio noise properties may be estimated qualitatively on the basis of these various electromagnetic and hydromagnetic wave mode regions. Frequency bands and regions of intense natural noise may be estimated. On the basis of the models considered, the radio noise properties around Jupiter are quite different from those encountered in the magnetosphere around the Earth. Wave particle interactions are largely confined to the immediate vicinity of the zenographic equatorial plane and guided propagation from one hemisphere to the other apparently does not occur, except for hydromagnetic modes of propagation. The characteristics of these local signals are indicative of the physical processes occurring in the Jovian magnetosphere. Thus, as a remote sensing tool, their observation will be a vital asset in the exploration of Jupiter.

Keywords

Radio Emission Mode Coupling Thermal Plasma Cyclotron Frequency Plasma Model 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Allis, W. P., Buchsbaum, S. J., and Bers, A.: 1962,Waves in Anisotropic Plasmas, Wiley.Google Scholar
  2. Carr, T. D., and Gulkis, S.: 1969, in L. Goldburg (ed.),Annual Reviews of Astronomy and Astrophysics, Vol. 7, Annual Reviews Inc., Palo Alto, p. 577.Google Scholar
  3. Cornwall, J. M., Coroniti, F. V., and Thorne, R. M.: 1970,J. Geophys. Res. 75, 4699.Google Scholar
  4. Dickel, J. R., Degioanni, J. J., and Goodman, G. C.: 1970,Radio Sci. 5, 517.Google Scholar
  5. Gledhill, J. A.: 1967, The Structure of Jupiter's Magnetosphere and the Affect of Io on Its Decimetric Radio Emission', NASA Goddard Report X-615-67-296.Google Scholar
  6. Ioannidis, G. and Brice, N.: 1970, submitted toIcarus.Google Scholar
  7. Kannel, C. F. and Petschek, H. E.: 1966,J. Geophys. Res. 71, 1.Google Scholar
  8. Kennel, C. F. and Scarf, F. L.: 1968,J. Geophys. Res. 73, 6149.Google Scholar
  9. Kennel, C. F., Scarf, F. L., Fredericks, R. W., McGehee, J. H., and Coroniti, F. V.: 1970,J. Geophys. Res.,75, 6136.Google Scholar
  10. Liemohn, H. B.: 1965,Radio Sci. 69D, 741.Google Scholar
  11. Liemohn, H. B.: 1967,J. Geophys. Res. 72, 39.Google Scholar
  12. Liemohn, H. B. and Kenney, J. F.: 1971, presented at the XIV Plenary meeting of COSPAR.Google Scholar
  13. Melrose, D. B.: 1967,Planetary Space Sci. 15, 381.Google Scholar
  14. Scarf, F. L.: 1970,Space Sci. Rev. 11, 234.Google Scholar
  15. Stix, T. H.: 1962,The Theory of Plasma Waves, McGraw Hill.Google Scholar
  16. Warwick, J. W.: 1970, ‘Particles and Fields near Jupiter’, Jet Propulsion Laboratory NASA Report CR-1685.Google Scholar

Copyright information

© D. Reidel Publishing Company 1973

Authors and Affiliations

  • H. B. Liemohn
    • 1
  1. 1.Boeing Aerospace GroupSpace and Planetary Environment Lab.SeattleUSA

Personalised recommendations