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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 1
Ann. Geophys., 15, 24–28, 1997
https://doi.org/10.1007/s00585-997-0024-3
© European Geosciences Union 1997
Ann. Geophys., 15, 24–28, 1997
https://doi.org/10.1007/s00585-997-0024-3
© European Geosciences Union 1997

  31 Jan 1997

31 Jan 1997

Electron cyclotron waves in the presence of parallel electric fields in the Earth's auroral plasma

S. Kumar, S. K. Dixit, and A. K. Gwal S. Kumar et al.
  • Space Plasma Laboratory, Department of Physics, Barkatullah University, Bhopal-462 026, India

Abstract. The electron cyclotron waves that originate at low altitudes (<0.5 RE) and observed by ground facilities have been studied in the presence of a weak parallel electric field in auroral magnetoplasma consisting of trapped energetic auroral electrons and cold background electrons of ionospheric origin. The model distribution for auroral trapped electrons is taken as Maxwellian ring distribution. An expression for the growth rate has been obtained in the presence of parallel electric field assuming that the real frequency in the whistler mode is not affected by the presence of the electric field. The results show that waves grow (or damp) in amplitude for a parallel (or antiparallel) electric field. The influence of the electric field is more pronounced at a shorter wavelength spectrum. An increase in population of energetic electrons increases the growth rate and thus, plays a significant role in the wave excitation process in the auroral regions.

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