ON THE ACCELERATION OF ENERGETIC IONS IN JUPITER'S MAGNETOSPHERE.

D. D. Barbosa, A. Eviatar, G. L. Siscoe

Research output: Contribution to journalArticlepeer-review

Abstract

A theoretical model and analysis of the acceleration of high-energy approximately MeV/nuc ions in Jupiter's magnetosphere are presented. All measurements conducted in this energy range have consistently pointed to the probable occurrence of local nonadiabatic acceleration above that obtainable by radial diffusion alone. The creation of fast 75 km/s neutral sulfur and oxygen atoms in the Io torus by charge exchange is considered first. This process will eject upward of 2 multiplied by 10**2**8 neutrals per second which are recaptured in the magnetosphere by subsequent electron impact and charge exchange with the ambient plasma outside the torus as well as by solar UV photoionization. All processes together lead to an injection rate of greater than 4 multiplied by 10**2**5 heavy ions recaptured per second with a gyrospeed comparable to the local plasma flow speed. It is shown that subsequent adiabatic radial diffusion cannot produce the observed spectrum or high energies required by observations. The stochastic acceleration of this seed population by magnetohydrodynamic (MHD) waves is considered next. It is demonstrated how the properties of the observed particle spectrum are related to those of the power spectrum of MHD fluctuations measured by the magnetometer.

Original languageEnglish
Pages (from-to)3789-3800
Number of pages12
JournalJournal of Geophysical Research C: Oceans
Volume89
Issue numberA6
DOIs
StatePublished - 1984

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