Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72a0606k&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM72A-0606
Physics
2730 Magnetosphere: Inner, 2760 Plasma Convection, 2764 Plasma Sheet, 2778 Ring Current
Scientific paper
Using more than a year of CLUSTER Ion Composition (CIS) perigee data, we have compiled a statistical data set of the quiet-time energy spectra of 20 eV to 40 keV H+, O+ and He+ for L-shells of 4--6 Re. The resulting spectra as a function of local time show the expected minima which result from the competition between electric field and magnetic gradient and curvature drifts in this energy range. In addition, the flux of O+ for energies less than 1 keV peaks on the dawn side. This peak may indicate a spatial variation in the O+ in the plasma sheet that feeds this region. We test this hypothesis by determining the drift trajectories of these low energy ions from the plasma sheet to the inner magnetosphere, to determine the source location in the plasma sheet for a particular magnetic local time in the inner magnetosphere. We then use CLUSTER measurements of the plasma sheet at 20 Re to determine whether the O+ flux varies as we would expect. Preliminary results indicate that an O+ flux peak on the dusk side in the plasma sheet is the source for the dawnside O+ enhancement in the inner magnetosphere.
Bosqued Jean Michel
Dandouras Iannis
Fournier Jessica
Kistler Lynn M.
Klecker Berndt
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