DyFK Simulation of the Geomagnetic Spectrometer Observed by POLAR/TIDE

Details DyFK Simulation of the Geomagnetic Spectrometer Observed by POLAR/TIDE DyFK Simulation of the Geomagnetic Spectrometer Observed by POLAR/TIDE

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm51a..05h&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM51A-05

Physics

2475 Polar Cap Ionosphere, 2736 Magnetosphere/Ionosphere Interactions (2431), 2760 Plasma Convection (2463), 2776 Polar Cap Phenomena

Scientific paper

Observations of characteristic streaming energies of outflowing ionospheric ions in the polar cap magnetosphere by approximately noon-midnight orbiting spacecraft frequently indicate a decline of the ion streaming energies from dayside to nightside. When multiple ion species are detected, generally an ion species separation is observed in which for similar energies, H+ tends to be confined closer to the dayside ion source, followed by He+ and O+ toward the nightside. These effects can be viewed as resulting from a natural geomagnetic mass spectrometer. Here we compare ion streaming energy observations by the Thermal Ion Dynamics Experiment (TIDE) on POLAR with ionospheric plasma transport simulations using the UT Arlington Dynamic Fluid Kinetic (DyFK) model. Using realistic parameters for soft electron precipitation and wave-particle perpendicular ion heating levels for the creation of the ionospheric cleft ion fountain (CIF) source region, as well as realistic convection values, the DyFK simulations show good agreement with measurements of the ion streaming energies along the POLAR orbit through the polar cap magnetosphere. The POLAR orbit in these cases typically covered an altitude range of 2 to 8 RE as the spacecraft traversed the polar cap magnetosphere. These and related results will be presented and discussed.

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