Relationship of Vertical Ion Flows and Topside Electron Temperature

Details Relationship of Vertical Ion Flows and Topside Electron Temperature Relationship of Vertical Ion Flows and Topside Electron Temperature

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42a11z&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM42A-11

Physics

2700 Magnetospheric Physics, 2724 Magnetopause, Cusp, And Boundary Layers, 2776 Polar Cap Phenomena

Scientific paper

We present four periods of vertical/field-aligned O+ flow parameters observed by DMSP12 and DMSP13 at 840 km when they passed the southern polar region near simultaneously during April 1996, together with POLAR observations at 5000 km near the same measurement period. This presentation provides a snapshot of the O+ vertical flow velocities and O+ densities as they relate to electron temperatures along distinct satellite tracks passing through both the expected cleft and auroral regions, and the polar cap region. We find some correlation between vertical velocity and electron temperature along the DMSP spacecraft tracks, but only a weak correlation between the vertical velocity and electron temperature was shown in the statistics for the whole period when both flow velocity and electron temperature were measured. Downward O+ flows occurred only for the lower (<4000 K) electron temperature regions. When electron temperatures were lower than 3000 K, the O+ densities generally increased as the electron temperatures increased. However, when the electron temperatures were greater than 3500 K, the O+ densities generally decreased as the electron temperatures increased. Different physical processes may correspond to these different correlation relations between O+ densities and electron temperatures.

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