On the acceleration of energetic ions in Jupiter's magnetosphere

Details On the acceleration of energetic ions in Jupiter's magnetosphere On the acceleration of energetic ions in Jupiter's magnetosphere

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.3789b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, June 1, 1984, p. 3789-3800.

Physics

34

Ion Temperature, Jupiter Atmosphere, Magnetospheric Ion Density, Particle Acceleration, Planetary Magnetospheres, Space Plasmas, Charge Exchange, Electron Impact, Energetic Particles, Magnetohydrodynamic Waves, Jupiter, Magnetosphere, Ions, Acceleration, Theoretical Studies, Models, Analysis, Energy, Radial Diffusion, Sulfur, Oxygen, Satellites, Io, Torus, Electrons, Plasma, Photoionization, Ultraviolet, Wavelengths, Injection, Spectra, Magnetohydrodynamics, Waves, Particles, Power, Magnetometer, Protons

Scientific paper

Several aspects of the problem of high-energy ions in the Jovian magnetosphere are addressed. Voyager observations pertaining to the problem of high-energy ions in the magnetosphere are summarized, and the charge exchange emission of fast neutral sulfur and oxygen atoms and their subsequent recapture by electron impact, charge exchange, and photoionization is considered. Solutions are given to the diffusion equation assuming a source of ions injected with a gyroenergy corresponding to pickup in the middle and outer magnetosphere. It is concluded that no reasonable model parameters exist to produce the required steep spectra of the particle observations with only pickup and adiabatic radial diffusion included. A local acceleration mechanism based on nonadiabatic wave-particle interactions is needed. The assumptions and model predictions of stochastic acceleration by MHD turbulence for the Jovian magnetosphere are described. The model makes a specific correspondence between MHD wave spectrum properties and particle spectrum properties at energies above the Alfven energy.

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