Vertical Plasma Flow in Auroral Boundary Coordinates for 1997

Details Vertical Plasma Flow in Auroral Boundary Coordinates for 1997 Vertical Plasma Flow in Auroral Boundary Coordinates for 1997

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm41a1681r&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM41A-1681

Physics

[2407] Ionosphere / Auroral Ionosphere, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2455] Ionosphere / Particle Precipitation

Scientific paper

Contemporary magnetosphere modelers are now including species dependent dynamics. Energetic O+ has significant consequences for the ring current stored energy and perhaps the timing of substorm injections. The mechanism by which thermal O+ escapes from the top of the ionosphere and into the magnetosphere is not fully understood. Previous work has indicated there is a MLT dependence on the energization efficiency of thermal ions between DMSP altitudes (~840km) and Polar altitudes (6000-9000km). The study was inconclusive because of uncertainties associated with expansion and contraction of the auroral oval. These results supported the need to project upwelling O+ in dynamic auroral boundary oriented coordinates. We have created a new algorithm to select appropriate equatorward and poleward boundaries for each polar crossing. Using this new auroral boundary coordinate system, we present vertical ion flow measured in-situ by the DMSP SSIES ion drift meters aboard F12 (noon-midnight) and F13 (dawn-dusk) satellites compared to higher altitude observations in auroral boundary coordinates for 1997.

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