Average spatial distributions of energetic O(+), O(2+), O(6+), and C(6+) ions in the magnetosphere observed by AMPTE CCE

Details Average spatial distributions of energetic O(+), O(2+), O(6+), and C(6+) ions in the magnetosphere observed by AMPTE CCE Average spatial distributions of energetic O(+), O(2+), O(6+), and C(6+) ions in the magnetosphere observed by AMPTE CCE

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.4459k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, May 1, 1987, p. 4459-4466.

Physics

25

Carbon, Energetic Particles, Magnetospheric Ion Density, Oxygen Ions, Solar Wind, Spatial Distribution, Ampte (Satellites), Diurnal Variations, Ionospheric Ion Density, Mass Spectrometers, Satellite-Borne Instruments, Time Dependence

Scientific paper

Measurements with the charge energy mass spectrometer of the AMPTE CCE spacecraft are used to determine the relative fluxes of these ions near the equatorial plane as a function of the drift shell parameter L, the magnetic activity index Kp, and the local time LT. The O(+) and O(2+) ions have radial profiles with maxima at about L = 5 and diurnal variations with a broad maximum on the dayside. The O(6+) and C(6+) ion fluxes increase with L between L = 5 and L = 7 and level off farther out. The diurnal variations of the relative O(6+) and C(6+) fluxes exhibit a pronounced minimum on the dayside. The observations can be interpreted in terms of ion convection from the tail onto quasi-trapped drift orbits and further radial diffusion onto closed drift shells. The maximum of the O(+) and O(2+) fluxes as well as the minimum of the O(6+) and C(6+) fluxes on the dayside can be explained by drift shell splitting. The inward transport is associated with ion losses, mainly by charge exchange. O(6+) and C(6+) ions are removed already at larger distances than O(+) and O(2+). As a result, the ionosphere contributes most of the oxygen ions in the magnetosphere. Important contributions from the solar wind are encountered in the outer magnetosphere.

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