Planetary spin period acceleration of particles in the Jovian magnetosphere

Details Planetary spin period acceleration of particles in the Jovian magnetosphere Planetary spin period acceleration of particles in the Jovian magnetosphere

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5189c&link_type=abstract

Journal of Geophysical Research, vol. 81, Oct. 1, 1976, p. 5189-5195.

Physics

13

Jupiter Atmosphere, Particle Acceleration, Planetary Magnetospheres, Planetary Rotation, Radiation Belts, Solar Wind, Centrifugal Force, High Energy Electrons, Magnetic Moments, Particle Diffusion, Particle Energy, Particle Flux Density, Relativistic Particles

Scientific paper

A four-step mechanism is proposed for the acceleration of energetic protons and relativistic electrons in Jupiter's magnetosphere. According to this mechanism, photoelectrons and ions from the Jovian ionosphere are: (1) ejected along magnetic-field lines toward the equator by the centrifugal force of corotation; (2) accelerated by magnetic-field annihiliation in the magnetotail, which process is modulated at Jupiter's rotational frequency; (3) trapped on closed field lines in the reconnection process, convected inward toward Jupiter from the merging region, and subjected to adiabatic compression; and (4) diffused inward by the conventional radial-diffusion process through a violation of the third adiabatic invariant. It is shown that the proposed mechanism produces magnetic moments much larger than those available from inward diffusion of solar-wind particles or motional emf acceleration at the Galilean satellites, provides a natural explanation for the 10-hr periodicity of the energetic particle fluxes observed inside the magnetosphere by the Pioneer spacecraft, and also produces a 10-hr periodicity in the energetic particle flux from the magnetosphere into interplanetary space in such a way that the phase of interplanetary flux variations is locked to the rotational phase of Jupiter

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