Energetic ion phase space densities in Neptune's magnetosphere

Details Energetic ion phase space densities in Neptune's magnetosphere Energetic ion phase space densities in Neptune's magnetosphere

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992icar...99..420c&link_type=abstract

Icarus (ISSN 0019-1035), vol. 99, no. 2, p. 420-429.

Physics

9

Auroras, Magnetosphere-Ionosphere Coupling, Neptune (Planet), Neptune Atmosphere, Planetary Magnetospheres, Ion Density (Concentration), Neptune Satellites, Radiation Belts, Voyager Project

Scientific paper

Ion phase densities of Neptune are presently ascertained at the first and second adiabatic invariants of charged-particle motion on the basis of an analysis of Voyager 2 measurements. The profiles thus obtained are interpreted as indicative of generally inward radial diffusion, with an energetic ion source near L = 10. Excellent agreement is obtained between inbound and outbound phase-space density profiles at the values of the invariants; this suggests approximately axisymmetric, quasi-stationary radiation belts. The inward diffusing power carried by energetic ions appears adequate for powering Neptune's aurora, if enough of the ions are lost to the Neptune atmosphere.

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