Astrophysics and Space Science

, Volume 72, Issue 1, pp 97–110 | Cite as

Adiabatic-drift-loss modification of the electromagnetic loss-cone instability for anisotropic plasma

  • B. Juhl
  • R. A. Treumann
Article
Received:

Abstract

Observation of the adiabatic behaviour of energetic particle pitch-angle distributions in the magnetosphere (Lyons, 1977, and others) in the past indicated the development of pronounced minima or drift-loss cones on the pitch-angle distributions centred at α≃90° in connection with storm-time changes in magnetospheric convection and magnetic field. Using a model of a drift-modified loss-cone distribution (MLCD) of the butterfly type, the linear stability of electromagnetic whistler or ion-cyclotron waves propagating parallel to the magnetic field has been investigated. The instability is shown to be quenched at high frequencies ω<ω m =A/(A+1), whereA is the thermal anisotropy. This quenching becomes stronger the higher are the respective parallel hot particle thermal velocityAh″ and cold plasma densityn c . Particles around pitch-angles α≃90° are identified as generating electromagnetic cyclotron waves near the marginally stable frequency ω m . It is concluded that the absence of electromagnetic VLF and ELF noise during times when MLCD develops is the result of the shift of the unstable spectrum to low frequencies.

Keywords

Linear Stability Energetic Particle Cold Plasma Stable Frequency Anisotropic Plasma 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

  1. Ashour-Abdalla, M. and Kennel, C. F.: 1976, in B. Hultqvist and L. Stenflo (eds.),Physics of the Hot Plasma in the Magnetosphere, Plenum Press, New York, p. 201.Google Scholar
  2. Ashour-Abdalla, M. and Kennel, C. F.: 1978,J. Geophys. Res. 83, 1531.Google Scholar
  3. Ashour-Abdalla, M. and Thorne, R. M.: 1977,Geophys. Res. Letters 4, 45.Google Scholar
  4. Ashour-Abdalla, M. and Thorne, R. M.: 1978,J. Geophys. Res. 83, 4755.Google Scholar
  5. Cowley, S. W. H. and Ashour-Abdalla, M.: 1976,Planet. Space Sci. 24, 1047.Google Scholar
  6. Cuperman, S. and Salu, Y.: 1974,J. Geophys. Res. 79, 2894.Google Scholar
  7. Dum, C. T., Marsch, E., Philipp, W. and Gurnett, D. A.: 1978,Ion Sound Turbulence in the Solar Wind, Preprint MPI/MPE, Garching, F.R.G. (to appear inSolar Wind 4,Lecture Notes in Physics, Springer).Google Scholar
  8. Dum, C. T., Marsch, E., and Phillipp, W.: 1980,J. Plasma Phys. 23, 91.Google Scholar
  9. Feldman, W. C., Asbridge, J. R., Bame, S. J., Montgomery, M. and Gary, S. P.: 1975,J. Geophys. Res. 80, 4181.Google Scholar
  10. Gary, S. P., Feldman, W. C., Forslund, D. F. and Montgomery, M. D.: 1975,J. Geophys. Res. 80, 4197.Google Scholar
  11. Gendrin, R.: 1975,Space Sci. Rev. 18, 145.Google Scholar
  12. Gendrin, R., Lacourly, S., Roux, A., Solomon, J., Feigin, F. Z., Gokhberg, M. V., Troitskaya, V. A. and Yakimenko, V. I.: 1971,Planet. Space Sci. 19, 165.Google Scholar
  13. Joselyn, J. A. and Lyons, L. R.: 1976,J. Geophys. Res. 81, 2295.Google Scholar
  14. Karpman, V. I., Alekhin, Ju. K., Borisov, N. D. and Ryabova, N. A.: 1975,Plasma Phys. 17, 361.Google Scholar
  15. Kaye, S. M., Lin, C. S., Parks, G. K. and Winckler, J. R.: 1978,J. Geophys. Res. 83, 2675.Google Scholar
  16. Kennel, C. F.: 1969,Rev. of Geophys. Space Phys. 7, 379.Google Scholar
  17. Kennel, C. F. and Petschek, H. E.: 1966,J. Geophys. Res. 71, 1.Google Scholar
  18. Kennel, C. F., Scarf, F. L., Fredricks, R. W., McGehee, J. H. and Coroniti, F. V.: 1970,J. Geophys. Res. 75, 6136.Google Scholar
  19. Kulkarni, V. H. and Rycroft, M. J.: 1979,Phys. Letters 70A, 422.Google Scholar
  20. Lauter, E. A., Grafe, A., Nikutowski, B., Taubenheim, J., Treumann, R. and Wagner, C. U.: 1979, in M. J. Rycroft (ed.)Space Research Vol. 19, Academic Press, New York, p. 351.Google Scholar
  21. Lin, C. S. and Parks, G. K.: 1974,J. Geophys. Res. 79, 2894.Google Scholar
  22. Lyons, L. R.: 1974,J. Geophys. Res. 79, 575.Google Scholar
  23. Lyons, L. R.: 1977,J. Geophys. Res. 82, 2428.Google Scholar
  24. Lyons, L. R. and Williams, D. J.: 1975,J. Geophys. Res. 80, 3985.Google Scholar
  25. Lyons, L. R. and Williams, D. J.: 1976,J. Geophys. Res. 81, 216.Google Scholar
  26. Maeda, K., Smith, P. H. and Anderson, R. R.: 1976,Nature 263, 37.Google Scholar
  27. Scarf, F. L., Fredricks, R. W., Kennel, C. F. and Coroniti, F. V.: 1973,J. Geophys. Res. 78, 3119.Google Scholar
  28. Solomon, J.: 1975, in V. Formisano (ed.),The Magnetospheres of the Earth and Jupiter, D. Reidel Publ. Co., Dordrecht, Holland, p. 153.Google Scholar
  29. Solomon, J.: 1976,J. Geophys. Res. 81, 3452.Google Scholar
  30. Spjeldvik, W. N. and Thorne, R. M.: 1975,J. Atmos. Terrest. Phys. 37, 777.Google Scholar
  31. Taylor, W. W. and Lyons, L. R.: 1976,J. Geophys. Res. 81, 6177.Google Scholar
  32. Treumann, R., and Grafe, A.: 1977,Physica Solariterr. Potsdam 4, 51.Google Scholar
  33. Treumann, R. and Nikutowski, B.: 1978,Phys. Letters 65A, 127.Google Scholar
  34. Treumann, R., Grafe, A. and Lehmann, H. R.: 1978,J. Geophys. 43, 719.Google Scholar
  35. Vedenov, A. A., Velikhov, E. I. and Sagdeev, R. Z.: 1961,Nucl. Fusion 1, 82.Google Scholar
  36. Vithal, K. L.: 1977a,Astrophys. Space Sci. 49, 293.Google Scholar
  37. Vithal, K. L.: 1977b,Astrophys. Space Sci. 49, 317.Google Scholar
  38. Williams, D. J.: 1976, in B. Hultqvist and L. Stenflo (eds.),Physics of the Hot Plasma in the Magnetosphere, Plenum Press, New York, p. 159.Google Scholar
  39. Williams, D. J. and Lyons, L. R.: 1974a,J. Geophys. Res. 79, 4195.Google Scholar
  40. Williams, D. J. and Lyons, L. R.: 1974b,J. Geophys. Res. 79, 4791.Google Scholar
  41. Young, T. S. T., Cullen, J. D. and McCune, J. E.: 1973,J. Geophys. Res. 78, 1082.Google Scholar

Copyright information

© D. Reidel Publishing Co 1980

Authors and Affiliations

  • B. Juhl
    • 1
  • R. A. Treumann
    • 2
  1. 1.Institut für Extraterrestrische PhysikMax-Planck-Institut für Physik und AstrophysikGarching b. MünchenWest Germany
  2. 2.Gruppe für RadioastronomieEidgenössische Technische Hochschule ZürichSwitzerland

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