DyFK Simulation of the O+ Density Trough at 5000 km Altitude in the Polar Cap

Details DyFK Simulation of the O+ Density Trough at 5000 km Altitude in the Polar Cap DyFK Simulation of the O+ Density Trough at 5000 km Altitude in the Polar Cap

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21b0264j&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM21B-0264

Physics

2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2447 Modeling And Forecasting, 2463 Plasma Convection (2760), 2483 Wave/Particle Interactions (7867)

Scientific paper

Measurements of the O+ densities in the polar cap near 5000 km altitude display normal and low density (0.01-0.1 O+/cc) regions. In this presentation, we use the UTA Dynamic Fluid-Kinetic (DyFK) model to simulate such O+ density profiles observed by the Thermal Ion Dynamics Experiment (TIDE) on the POLAR spacecraft. Using solar wind parameters for these events to derive a time-varying high-latitude convection model and incorporating auroral energization effects, which includes the effects of both soft electron precipitation and transverse 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. For the convection patterns thus computed, these flux tubes nominally intersected the POLAR trajectory where the density measurements were made. It is found that, under the combination of F-region recombination processes during trajectory segments when the low altitude portions of such flux tubes are in darkness, and the energization/heating effects in the auroral region, normal and low trough-like densities at higher altitudes developed depending on the flux tube trajectories. The simulations of the density profiles for these flux tubes will be compared with measured POLAR/TIDE-measured O+ densities.

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