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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 6
Ann. Geophys., 15, 597–602, 1997
https://doi.org/10.1007/s00585-997-0597-x
© European Geosciences Union 1997
Ann. Geophys., 15, 597–602, 1997
https://doi.org/10.1007/s00585-997-0597-x
© European Geosciences Union 1997

  30 Jun 1997

30 Jun 1997

A theoretical verification of intensity of plasmaspheric ELF hiss emissions: theory versus GEOS-1 observations

R. Prakash1, R. P. Singh1, R. C. Awasthi1, and D. P. Singh2 R. Prakash et al.
  • 1Department of Physics, Bipin Bihari PG College, Jhansi-284 001, India
  • 2Department of Physics, Government College, Adampur-125 052, Hissar, India

Abstract. An attempt is made to confirm the generation mechanism of plasmaspheric ELF hiss emissions observed aboard GEOS-1 satellite in the equatorial region both at small and large wave normal angles by calculating their magnetic field intensities in terms of incoherent Cerenkov radiation mechanism and cyclotron resonance instability mechanism, using appropriate and suitable plasma parameters. The ELF intensities calculated by Cerenkov radiation mechanism, being 4 to 5 orders of magnitude lower than the observed intensities, rule out the possibility of their generation by this mechanism. On the other hand, the intensities calculated under electron cyclotron resonance instability mechanism are found to be large enough to account for both the observed intensity and propagation losses and hence to confirm that plasmaspheric ELF hiss emissions observed aboard GEOS-1 satellite both at small and large wave normal angles were originally generated in the equatorial region by this mechanism just near the inner edge of the plasmapause. The difference in the observed intensities of two types of the emissions has been attributed to the propagation effect rather than the generation effect.

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