Formula representation of auroral ionospheric O+ outflows based on systematic simulations with effects of soft electron precipitation and transverse ion heating

Details Formula representation of auroral ionospheric O+ outflows based on systematic simulations with effects of soft electron precipitation and transverse ion heating Formula representation of auroral ionospheric O+ outflows based on systematic simulations with effects of soft electron precipitation and transverse ion heating

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3406103z&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 6, CiteID L06103

Physics

4

Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Ionosphere: Particle Precipitation, Ionosphere: Topside Ionosphere, Ionosphere: Wave/Particle Interactions (7867), Magnetospheric Physics: Numerical Modeling

Scientific paper

Systematic Dynamic Fluid Kinetic (DyFK) model simulations are conducted to obtain a simulation-based formula representation of the O+ outflow flux level versus the energy flux of soft electron precipitation, and wave spectral density of transverse wave heating in the high-latitude auroral region. Based on results of 140 DyFK simulations of auroral outflows, we depict the O+ outflows at the ends of these two hour simulation runs in spectrogram form versus these parameters. We also approximate the results by the formula representation: Flux O + = 8.8(3.0 × 105 + 2f e 1.4 × 107)(tanh (8D wave ) + 0.2D wave 0.6), where Flux O + is the O+ number flux in cm-2/s at 3 RE mapped to 1000 km altitude, f e is the electron precipitation energy flux in ergs cm-2/s, and D wave is the wave electric field spectral density at O+ gyrofrequency at 1 RE in (mV)2 m-2 Hz-1. This formula representation provides a convenient way to set the boundary conditions of the ionosphere in global magnetosphere simulation since the ionosphere is the important plasma source of the magnetosphere.

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