Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm31b0460j&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM31B-0460
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2736 Magnetosphere/Ionosphere Interactions (2431), 2776 Polar Cap Phenomena
Scientific paper
Thermal ion measurements by the Thermal Ion Dynamics Experiment(TIDE) on the POLAR spacecraft show that the O+ densities in the polar cap near 6000 km altitude display structured variations featuring low-density trough regions. We use the UT Arlington Dynamic Fluid-Kinetic (DyFK) model to model such O+ density profiles. Treating different cases of TIDE observations near polar perigee by using available measured solar wind parameters to drive a time-varying high-latitude convection model and incorporating auroral processes of soft electron precipitation and wave-driven ion heating, we simulate the evolving high-latitude ionospheric plasma transport and associated parameter profiles for several convecting flux tubes in the high-latitude ionosphere- magnetosphere system, incorporating estimated locations of the auroral processes regions from HYDRA and the Ovation auroral oval model. This auroral oval model has as inputs auroral precipitation measurements from DSMP. For the convection patterns thus computed, these flux tubes nominally intersected the POLAR trajectory where the density measurements were made. It is found that, owing chiefly to F-region recombination processes during trajectory segments when the low altitude portions of such flux tubes in darkness, as well as incorporating auroral fountain effects in the auroral region, normal and low trough-like densities at higher altitudes developed along these flux tubes. The modeled densities near 6000 km altitudes will be compared with multiple trough events featuring POLAR/TIDE-measured O+ densities for inside and outside of such trough regions.
Horwitz James L.
Jaafari F. B.
Zeng Weifei
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