Advertisement

Direction Finding of Magnetospheric VLF/ELF Emissions and Their Generation Mechanism

  • M. Hayakawa

Abstract

The purpose of this report is to review our recent studies on the generation and propagation mechanisms of magnetospheric VLF/ELF emissions based on the direction finding measurements on board spacecrafts in order to demonstrate the potential use of the direction finding measurements in plasma wave studies. The plasma waves treated in this report are, (1) half-gyrofrequency VLF emissions, (2) ELF hiss in detached plasma regions of the magnetosphere, (3) plasmaspheric ELF hiss, and (4) VLF/ELF chorus. We then point out the technical problems to be investigated concerning the spacecraft direction finding measurement to be used for the future satellite experiments.

Keywords

Plasma Wave Oblique Wave Chorus Emission Wave Normal Angle Cold Plasma Density 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Hayakawa M., Yamanaka Y., Parrot M., Lefeuvre F (1984) The wave normals of magnetospheric chorus emissions observed onboard GEOS-2. J.Geo- phys. Res. 89: 2811–2821Google Scholar
  2. 2.
    Ohmi N., Hayakawa M (1986) On the generation mechanism of quasi-electrostatic half-gyrofrequency whistler-mode waves in the magneto- spheric plasma. J. Plasma Phys. 35: 351–373CrossRefGoogle Scholar
  3. 3.
    Muto H., Hayakawa M., Parrot M., Lefeuvre F (1987) Direction finding of half-gyrofrequency VLF emissions in the off-equatorial region of the magnetosphere and their generation and propagation. J. Geophys. Res. 92: 7538–7552CrossRefGoogle Scholar
  4. 4.
    Hayakawa M (1989) Direction finding of half-gyrofrequency VLF emissions in the off-equatorial region of the magnetosphere. Proc.NIPR Symp. on Upper Atmosphere Phys. 1: 168–172Google Scholar
  5. 5.
    Hayakawa M., Ohmi N., Parrot M., Lefeuvre F (1986) Direction finding of ELF hiss emissions in a detached plasma region of the magnetosphere. J. Geophys. Res. 91: 135–141CrossRefGoogle Scholar
  6. 6.
    Hayakawa M (1987) The generation mechanism of ELF hiss in detached plasma regions of the magnetosphere as based on the direction finding results. Mem. Natl Inst. Polar Res. Tokyo, Special Issue 47: 173–182Google Scholar
  7. 7.
    Hayakawa M., Parrot M., Lefeuvre F (1986) The wave normals of ELF hiss emissions observed onboard GEOS-1 at the equatorial and off-equatorial regions of the plasmasphere. J. Geophys.Res. 91: 7989–7999CrossRefGoogle Scholar
  8. 8.
    Hayakawa M., Parrot M., Lefeuvre F (1987) The wave distribution functions of plasmaspheric ELF hiss: Geos 1 observation in equatorial region. Mem. Natl Inst. Polar Res. Tokyo, Special Issue 47: 157–172Google Scholar
  9. 9.
    Hayakawa M., Hattori K., Shimakura S., Parrot M. Lefeuvre F (1990) Direction finding of chorus emissions in the outer magnetosphere and their generation and propagation. Planet.Space Sci. 38: 135–143Google Scholar
  10. 10.
    Hayakawa M., Muto H., Shimakura S., Hattori K., Parrot M., Lefeuvre F (1989) The wave normal direction of chorus emissions in the outer magnetosphere. Proc. NIPR Symp. on Upper Atmosphere Phys. 2: 67–73Google Scholar
  11. 11.
    Hattori K., Ishikawa K., Hayakawa M (1990) Ray-tracing interpretation of wave normals of chorus emissions observed in the off-equatorial region of the outer magnetosphere. ibid, in press.Google Scholar
  12. 12.
    Hayakawa M., Lefeuvre F., Rauch JL (1985) The direction finding aboard Aureol 3 of ELF waves at frequency above and below the proton gyro- frequency. Resultats du Project ARCAD 3 et des programmes recents en Physique de la magnetosphere et de 1’ionosphere, Toulouse “84”, Cepadues Edit. 499–507Google Scholar
  13. 13.
    Hayakawa M., Lefeuvre F., Rauch JL (1990) On the system of Aureol-3 satellite direction finding for ionospheric and magnetospheric ELF waves. Trans.Inst.Elect.Inform.Comm.Engrs.Japan, in pressGoogle Scholar
  14. 14.
    Oscarsson T., Ronnmark K (1989) Reconstruction of wave distribution functions in warm plasma. J. Geophys. Res. 94: 2417–2428CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Tokyo 1991

Authors and Affiliations

  • M. Hayakawa
    • 1
  1. 1.Research Institute of AtmosphericsNagoya UniversityAichiJapan

Personalised recommendations