Polar Study of Ion Outflow Versus its Energy Input

Details Polar Study of Ion Outflow Versus its Energy Input Polar Study of Ion Outflow Versus its Energy Input

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm22c..07z&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM22C-07

Physics

2483 Wave/Particle Interactions, 2708 Current Systems (2409), 2716 Energetic Particles, Precipitating, 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

A statistical study of the ion outflow versus its energy input is performed by using multi-instrument data (TIDE, EFI, MFI, HYDRA) of Polar during its perigee auroral passes in the year 2000. Several important physical quantities connected to the ion outflow have been investigated, among which are the Poynting flux from the perturbation fields (below 1./6 Hz), the electron density, temperature and the electron energy density. The perturbation fields here to calculate the Poynting flux may be associated with the small-scale quasi-static electric field structures of the field-aligned currents or/and time-varying Alfven wave structures, which are both proven to be important energy sources to power the aurora. Our preliminary results show that the field-aligned ion outflow flux correlates best with the Earth-directed Poynting flux and the precipitating electron density, and also with a much weaker correlation with the electron energy density and temperature. The findings from this Polar study are similar to those from FAST. The general corroboration between the independent data sets of the two spacecraft suggests that the empirical ion outflow scaling laws can be established, which will be beneficial to global simulation efforts.

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