HR: 1340h
AN: SM33B-1339    [Abstracts]
TI: Resonance Zones for Electron Interaction with Plasma Waves in the Earth's Dipole Magnetosphere
AU: * Ni, B
EM: bbni@math.mun.ca
AF: Memorial University of Newfoundland, Dept of Math and Stats, St John's, NF A1C 5S7, Canada
AU: Summers, D
EM: dsummers@math.mun.ca
AF: Memorial University of Newfoundland, Dept of Math and Stats, St John's, NF A1C 5S7, Canada
AB: Wave-particle interactions play an important role in radiation belt particle dynamics. For the Earth's dipole magnetosphere,we determine regions of electron cyclotron resonance with various types of plasma wave. We call these regions resonance zones. The spatial extent of a resonance zone is controlled by the Doppler cyclotron resonance condition and the wave dispersion relation. For a given wave mode, a resonance zone depends on the wave frequency,electron energy,pitch-angle,and the local values of the electron number density and magnetic field. In order to take account of density variation along magnetic field lines,we adopt three different models for the spatial distribution of electron density inside and outside the plasmasphere. For subluminous waves including whistler-mode chorus,whistler-mode hiss,and electromagnetic ion cyclotron waves,we construct resonance zones for both field-aligned and oblique propagation with respect to the background dipole field. We also determine resonance zones for the superluminous (AKR) R-X, L-O, and L-X modes. Resonance zones are useful in analyzing electron dynamics in the inner magnetosphere, in particular in conjunction with ray-tracing studies and observed spatial distributions of plasma waves.
DE: 2716 Energetic particles: precipitating
DE: 2720 Energetic particles: trapped
DE: 2730 Magnetosphere: inner
DE: 2774 Radiation belts
DE: 7845 Particle acceleration
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting