Modeling Polar Cap Field-aligned Electron Density Profiles Measured with IMAGE Radio Plasma Imager

Details Modeling Polar Cap Field-aligned Electron Density Profiles Measured with IMAGE Radio Plasma Imager Modeling Polar Cap Field-aligned Electron Density Profiles Measured with IMAGE Radio Plasma Imager

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm12a1202t&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM12A-1202

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2467 Plasma Temperature And Density, 2475 Polar Cap Ionosphere, 2776 Polar Cap Phenomena

Scientific paper

A dynamic fluid semi-kinetic (DyFK) model is used to simulate the ion field-aligned flows within flux tubes drifting along a model specified convection line across the polar ionosphere. In this DyFK model, the collision dominated portion of the flux tube is treated with a moment-based fluid model for altitudes from 120 to 1100 km, while the generalized semi-kinetic model is used for 1100 km to 3 RE region. The effects of auroral soft electron precipitation, centrifugal acceleration, wave-driven transverse ion heating and parallel potentials are incorporated into the simulation of the ion field-aligned transport. The modeled field-aligned electron density profiles in the polar cap are compared with several field-aligned density profiles measured by the Radio Plasma Instrument (RPI) on the IMAGE satellite on March 4, 2003, in a weak magnetic storm (minimum Dst value of -58 nT). The electron densities were substantially elevated during the magnetic storm, with electron density reaching ~10 cm-3 at 2.8 RE altitude. It is found that reasonable parameters for the indicated aurora processes could raise the modeled electron densities to the level of the densities measured by the IMAGE/RPI. The simulation results indicate that the O+ becomes the dominant ion species in the altitude range considered for high density cases.

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