Inhomogeneity and nonlinearity effects on stop bands of Alfvenic ion cyclotron waves in multicomponent plasma

Details Inhomogeneity and nonlinearity effects on stop bands of Alfvenic ion cyclotron waves in multicomponent plasma Inhomogeneity and nonlinearity effects on stop bands of Alfvenic ion cyclotron waves in multicomponent plasma

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1767n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1767-1773. Research supported by the Academy of Finl

Physics

2

Geomagnetism, Ion Cyclotron Radiation, Magnetohydrodynamic Waves, Magnetospheric Ion Density, Plasma Composition, Wave Propagation, Cyclotron Resonance, Geos Satellites (Esa), Helium Ions, Oxygen Ions

Scientific paper

The existence of stop bands for left-handed Alfvenic ion cyclotron waves propagating in the direction of magnetic field in a multicomponent plasma is investigated. Three effects are discussed: finite ion temperature, inhomogeneous magnetic field, and nonlinear wave amplitude. All of them affect the existence of stop bands and set critical bounds on the relevant physical parameters, particularly on the density of heavy ions. Using the model of a linearly varying, longitudinally inhomogeneous magnetic field, the critical lower bound on heavy ion density is calculated as a function of longitudinal inhomogeneity, and the difference between the truly inhomogeneous and essentially homogeneous situations is discussed. Typical values for the wave vector in the resonance region are derived. Also, the condition for stop band formation in the nonlinear case is derived. The obtained results are applied to the magnetospheric environment and are shown to lead to relevant modifications.

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