Theory of ring sweeping of energetic particles

Details Theory of ring sweeping of energetic particles Theory of ring sweeping of energetic particles

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9619123p&link_type=abstract

Journal of Geophysical Research Supplement (ISSN 0148-0227), vol. 96, Oct. 30, 1991, p. 19,123-19,129. Research supported by NAS

Mathematics

Probability

13

Energetic Particles, Neptune (Planet), Planetary Magnetospheres, Planetary Rings, Cosmic Rays, Magnetic Field Configurations, Particle Precipitation, Planetary Magnetic Fields, Protons

Scientific paper

Because the effective 'area' of the Neptunian rings is larger than that of the inner moons, the sweeping of energetic particles by the rings is perhaps the dominant process for particle loss in the magnetosphere within 5 R(N). In this paper, a theory for calculating the absorption probability of energetic charged particles by the rings is described. The effects of a large tilt and an offset between the planet and dipole centers are included. It is found that the probability of absorption for protons is so high that the sweeping lifetime is only a few times the gradient-curvature drift period. For electrons, the sweeping lifetime is even less. The pitch angle dependence for sweeping manifests itself strongly only at large equatorial pitch angles. Lower-energy particles have higher absorption rates by the rings.

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