Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm13e..05p&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM13E-05
Other
2431 Ionosphere/Magnetosphere Interactions (2736), 2447 Modeling And Forecasting, 2730 Magnetosphere: Inner, 2764 Plasma Sheet
Scientific paper
Energetic O+ has important dynamic effects on the ring current. Insights into the effects of O+ on ring current dynamics have come primarily from models, not observations. Here we report observations made on the Polar spacecraft by the Toroidal Imaging Mass-Angle Spectrograph (TIMAS) which has measured the flux and energy distribution of escaping O+, cast in auroral boundary coordinates. Comparison with ISEE -1 observations of O+ in the plasma sheet, other recent observations, and multi-fluid simulations of the magnetosphere suggest that there are two distinct pathways for the energization and transport of O+ from the dayside ionosphere to the plasma sheet: 1) Energization and transport over the polar cap into the central plasma sheet which our analysis suggests is significant only during geomagnetically active times; and 2) Energization and transport in three dimensional magnetospheric fields during geomagnetically quiet times that leads to a significant O+ population on the plasma sheet flanks. The consequences of the suggested activity-dependant O+ transport path and transport of O+ in boundary related coordinates have not been previously explored.
Andersson L.-L.
Callahan B.
Collin Henry
Elkington S.
Peterson William
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