Parametrization of ion Upwelling for Auroral Precipitation

Details Parametrization of ion Upwelling for Auroral Precipitation Parametrization of ion Upwelling for Auroral Precipitation

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa33a1055d&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA33A-1055

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2447 Modeling And Forecasting, 2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

Plasma outflow into the magnetosphere is of considerable importance for mass loading of the magnetosphere. It is generally believed that ion outflow occurs in two steps, the first of which is upwelling of ions which increases the concentration of heavier ions at higher altitudes as the source population for secondary upward acceleration. In this simulation study, heating and ionization due to auroral electron precipitation is considered the main cause of for ion upwelling. The model solves neutral and ion momentum equations which include basic plasma transport coefficients, ionization and recombination terms as well as plasma-neutral collisions. The model also includes generalized Ohm's law considering self-consistent terms for resistivity, electron pressure gradients and Hall physics. The energy equations consider temperature contact terms between electrons, ions, and neutrals and the heat conduction term. Our model results demonstrate that ion upwelling is caused by pressure gradient forces due to ionization and electron heating from auroral precipitation. Softer auroral precipitation leads to larger upward fluxes and velocities because pressure gradients develop at higher altitudes in less collision dominated regions. Input parameters of the characteristic energy and the energy flux are used to parameterize properties of the ion upwelling such as particle fluxes, velocities, force densities, and acceleration.

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