Dynamic Fluid-Kinetic Simulations on High Plasma Densities at Polar Latitudes Observed by IMAGE RPI during Magnetic Storms

Details Dynamic Fluid-Kinetic Simulations on High Plasma Densities at Polar Latitudes Observed by IMAGE RPI during Magnetic Storms Dynamic Fluid-Kinetic Simulations on High Plasma Densities at Polar Latitudes Observed by IMAGE RPI during Magnetic Storms

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm32a0802t&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM32A-0802

Physics

2475 Polar Cap Ionosphere, 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling, 2788 Storms And Substorms

Scientific paper

We simulate the unusually high plasma density profiles observed by the Radio Plasma Imager (RPI) on board the IMAGE satellite over the polar ionosphere during November 6 2000 geomagnetic storm, using our Dynamic Fluid semi-Kinetic (DyFK) ionospheric transport model. RPI can remotely probe the surrounding plasma environment up to several RE away from the IMAGE spacecraft by broadcasting a sweep of radio wave signals from 3 kHz to 3MHz. The polar cap electron density profiles are obtained from an inversion of guided echoes received back at the RPI instrument at high latitudes. The DyFK model couples a moment-based fluid model for altitudes from 120 - 1100 km to a generalized semi-kinetic treatment for the topside through 4 RE region. Various processes, such as cleft/auroral soft electron precipitation, transverse ion heating by broadband ELF waves, and hot plasma-driven potential drops are incorporated into the generalized semi-kinetic treatment of topside ionosphere. Simulation results are in fgood agreement with those observed. Based on the comparison between the simulation and observation, we discuss the mechanisms that can produce such high plasma densities over the polar ionosphere during magnetic storms.

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