Physics – Plasma Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10326585p&link_type=abstract
Journal of Geophysical Research, Volume 103, Issue A11, p. 26585-26594
Physics
Plasma Physics
1
Magnetospheric Physics: Energetic Particles, Trapped, Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Wave/Particle Interactions
Scientific paper
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 γ~ni1/2, 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 γ~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.
Feygin F. Z.
Kangas Jorma
Kant Shukla Padma
Mursula Kalevi
Parrot Michel
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