Physics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14...95o&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, Feb. 1987, p. 95-98.
Physics
11
Energetic Particles, Interplanetary Magnetic Fields, Ion Motion, Particle Acceleration, Plasma Interactions, Shock Wave Interaction, Electron Acceleration, Heavy Ions, Magnetoacoustic Waves, Plasma Resonance, Voyager 2 Spacecraft
Scientific paper
Resonant ion and proton acceleration are demonstrated, theoretically, to have caused an acceleration of energetic ions to 200 MeV, which were observed by the Voyager 2 spacecraft. The acceleration is correlated with a quasi-perpendicular magnetosonic shock wave propagating at an angle of 87.5 deg 1.9 AU from the sun. Nonlinear wave theory based on a two-fluid cold plasma is used to show that a large potential jump forms in a magnetosonic shock wave. An expression is defined for calculating the maximum velocity to which resonant ions would have beeen accelerated. It is found that the kinetic energy absorbed by the particles would increase with the mass of the ions, and that the acceleration is very strong in nearly perpendicular shock propagating at angles close to 88.7 deg.
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