HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Oxygen cyclotron harmonic waves in the deep plasmasphere during magnetic storms

Abstract : A new approach to the generation of storm-associated ULF waves with discrete spectra (ion cyclotron harmonic waves) observed in the equatorial plasmasphere is presented. It is proposed that the appearance of waves with phase velocities smaller than the Alfv6n velocity is connected with a strong dispersion of magnetosonic waves near the hi-ion frequency occurring in the presence of oxygen ions of ionospheric origin. The waves are generated by an instability involving hot oxygen ions with loss cone or ring like distributions. Such ions are found in the magnetosphere during magnetic storms. A simple analytical model of this instability is elaborated. It is shown that ULF wave observations on board Akebono satellite are in a reasonable agreement with the present theoretical approach.
Document type :
Journal articles
Complete list of metadata

Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Tuesday, May 25, 2021 - 4:40:25 PM
Last modification on : Tuesday, October 19, 2021 - 6:59:16 PM
Long-term archiving on: : Thursday, August 26, 2021 - 8:34:12 PM


Publisher files allowed on an open archive


  • HAL Id : insu-03235174, version 1



O Pokhotelov, D Pokhotelov, F. Z. Feygin, V. Gladychev, Michel Parrot, et al.. Oxygen cyclotron harmonic waves in the deep plasmasphere during magnetic storms. Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 1997, 102, pp.77-83. ⟨insu-03235174⟩



Record views


Files downloads