Energetic particle signatures of satellites and rings in Neptune's magnetosphere

Details Energetic particle signatures of satellites and rings in Neptune's magnetosphere Energetic particle signatures of satellites and rings in Neptune's magnetosphere

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12...71s&link_type=abstract

(Planetary studies; Proceedings of Symposium 4 and the Topical Meeting of the Interdisciplinary Scientific Commission B /Meeting

Computer Science

Energetic Particles, Neptune (Planet), Neptune Satellites, Planetary Magnetospheres, Planetary Rings, Radiation Absorption, Magnetospheric Electron Density, Radiation Belts

Scientific paper

The cosmic ray system on Voyager 2 found a trapped radiation environment in Neptune's inner magnetosphere which is controlled primarily by absorption at the rings and satellite surfaces. The intensity of electrons with kinetic energies approximately greater than 1 MeV shows particularly strong and narrow signatures associated with absorption by the satellite 1989N1 at an orbital radius of 4.75 Neptune radii. Closer to the planet are several signatures of the inner satellites and rings. Absorption limits the intensity of the inner radiation belt sufficiently for the maximum intensity to occur outside the orbit of 1989N1 at a magnetic L shell of about 7. Radial profiles of the electron phase space density show that electrons diffuse inward from a source in the outer magnetosphere. Many of the inward-diffusing electrons are absorbed upon reaching a satellite orbital radius, but the finite absorption efficiency allows some of the electrons to pass by unaffected. The locations of the satellite and ring signatures also provide constraints on the nondipolar components of the planetary magnetic field.

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