Excitation of helium cyclotron harmonic waves during quiet magnetic conditions - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Journal of Geophysical Research Space Physics Year : 1998

Excitation of helium cyclotron harmonic waves during quiet magnetic conditions

L Stenfio
  • Function : Author
O. A Pokhotelov
  • Function : Author
D. O Pokhotelov
  • Function : Author
F. Z Feygin
  • Function : Author
J. Kangas
  • Function : Author
K. Mursula
  • Function : Author
P. K Shukla
  • Function : Author
L. Stenflo
  • Function : Author

Abstract

A general approach to the generation of ion cyclotron harmonic waves observed on board the Akebono satellite in the deep plasmasphere is presented. It is shown that during quiet magnetic conditions the development of the hydrodynamic cyclotron instability with growth rate ,-/oc n•/2 where ni is the number density of the hot heavy ions, is suppressed by the field-aligned inhomogeneity of the dipole magnetic field. The instability is, in this case, controlled by the weak resonant interaction of the waves and the trapped particles with growth rate-/oc ni. The waves are generated by a kinetic instability involving hot helium ions with a ring-like distribution. Such ions are present in the magnetosphere during quiet magnetic conditions. A simple analytical model of this instability accounting for the inhomogeneity of the ambient magnetic field is used. It is shown that the ULF wave observations during quiet times on board the Akebono satellite are in a reasonable agreement with the present theoretical approach.
Fichier principal
Vignette du fichier
98JA02619.pdf (774.87 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03235032 , version 1 (25-05-2021)

Identifiers

Cite

L Stenfio, O. A Pokhotelov, D. O Pokhotelov, F. Z Feygin, Michel Parrot, et al.. Excitation of helium cyclotron harmonic waves during quiet magnetic conditions. Journal of Geophysical Research Space Physics, 1998, 103 (A11), pp.26585-26593. ⟨10.1029/98JA02619⟩. ⟨insu-03235032⟩
25 View
14 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More