Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002stin...0305691c&link_type=abstract
Technical Report, Alabama Univ. Huntsville, AL United States Office of Research Administration
Physics
Atmospheric Physics, Convection, Flow Velocity, High Altitude, Low Altitude, Solar Maximum Mission, Apogees, Auroras, Correlation, Crossovers, Ions, Perigees, Polar Caps, Polar Regions, Tides
Scientific paper
During the course of this research, several investigations have been carried out at both high and low altitudes. The low altitude studies are those associated with perigee observations of ion field-aligned flows measured by POLAR/TIDE near 5000 km altitude. High altitude studies employed ion observations near apogee (above 6 RE geocentric). In both cases the observations occur at high latitudes, in or near the polar regions: the southern polar region for the low altitude studies and the northern polar region for the high altitude studies. A study of the relationship between field-aligned flow velocities, fluxes, and densities to convection speeds was published in the Journal of Atmospheric and Terrestrial Physics . Here we have demonstrated an anti-correlation between the 0+ densities and the convection speeds, and a correlation between the parallel upward velocities and the convection speeds, and have discussed these results as being compatible with the Cleft Ion Fountain concept for supplying O+ ions to the polar cap magnetosphere. Another topic investigated was the relationship between TIDE-observed upward and downward parallel O+ bulk velocities near 5000 km altitude over the southern polar regions, and near-simultaneous auroral observations by the Ultra-Violet Imager. We have prepared several overlaid plots of such auroral images across an MLT-ILAT dial plot of the polar regions with upward and downward velocities, as well as other parameters such as ion densities and fluxes. The overlaid plots show quite nicely how upward velocities and crossovers between upward and downward velocities occur in association with auroral forms, while downward flows are associated with dark regions of the polar cap.
Comfort Richard H.
Horwitz James L.
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