HR: 0800h
AN: SM51A-0274 [Abstracts]
TI: 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
AU: * Horwitz, J L
EM: horwitz@uta.edu
AF: Department of Physics, The University of Texas at Arlington, Arlington, TX 76019,
AU: Zeng, W
EM: zengw@uta.edu
AF: Department of Physics, The University of Texas at Arlington, Arlington, TX 76019,
AB:
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.
DE: 2431 Ionosphere/magnetosphere interactions (2736)
DE: 2704 Auroral phenomena (2407)
DE: 2736 Magnetosphere/ionosphere interactions (2431)
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting