Physics-based formula representations of high-latitude ionospheric outflows: H+ and O+ densities and flow velocities vs. precipitation, wave-heating, and solar zenith angle effects

Details Physics-based formula representations of high-latitude ionospheric outflows: H+ and O+ densities and flow velocities vs. precipitation, wave-heating, and solar zenith angle effects Physics-based formula representations of high-latitude ionospheric outflows: H+ and O+ densities and flow velocities vs. precipitation, wave-heating, and solar zenith angle effects

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm51a0274h&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM51A-0274

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

For many current global magnetospheric modeling efforts, it is highly desirable to try to incorporate realistic compact representations of the ionospheric outflow bulk parameters and their relationships to putative drivers. Recent satellite data analyses by Strangeway et al. [2005] and Zheng et al.[2005] have obtained formula fits for the measurement-based relationships of the outflow levels to parameterizations for electron precipitation and Poynting fluxes, which are expected to be among the principal drivers, or closely related to them, for the ionospheric outflows. In this presentation, we shall use the results of an extensive set of systematic simulation runs with our Dynamic Fluid Kinetic (DyFK) simulation code for ionospheric plasma field-aligned transport to obtain O+ and H+ densities and flow velocities at altitudes corresponding to typical inner boundary levels for prominent current global magnetospheric models which are moving toward multi-fluid treatments. These O+ and H+ densities and parallel flow velocities are parameterized versus precipitation electron energy flux levels, characteristic energy levels of the precipitating electron, the peak spectral wave densities for BBELF waves which transversely heat ionospheric ions, and solar zenith angle. Strangeway, R. J., R. E. Ergun, Y.-J. Su, C. W. Carlson, and R. C. Elphic, Factors controlling ionospheric outflows as observed at intermediate altitudes, J. Geophys. Res., 110, A03221, doi:10.1029/2004JA010829, 2005. Zheng, Y., T. E. Moore, F. S. Mozer, C. T. Russell, and R. J. Strangeway, Polar study of ionospheric ion outflow versus energy input, J. Geophys. Res., 110, A07210, doi:10.1029/2004JA010995, 2005.

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