Storm enhanced densities (SED) as possible sources for Cleft Ion Fountain dayside ionospheric outflows

Details Storm enhanced densities (SED) as possible sources for Cleft Ion Fountain dayside ionospheric outflows Storm enhanced densities (SED) as possible sources for Cleft Ion Fountain dayside ionospheric outflows

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3504103z&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 4, CiteID L04103

Physics

2

Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Ionosphere: Polar Cap Ionosphere, Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934), Magnetospheric Physics: Cusp, Magnetospheric Physics: Plasmasphere

Scientific paper

Foster et al. (2002) and others have reported on elevated ionospheric density regions being convected from the subauroral plasmaspheric region toward noon, in association with convection of plasmaspheric tails in the dayside magnetosphere. It has been suggested that these so-called Storm Enhanced Density (SED) regions could serve as ionospheric plasma source populations for cleft ion fountain outflows. To investigate this scenario, the University of Texas at Arlington Dynamic Fluid Kinetic (DyFK) model is employed to simulate the entry of a high-density plasmasphere-like flux tube entering the cleft region and subjected to an episode of wave-driven transverse ion heating. In these transport simulations, the O+ ion density at higher altitudes is found to increase while the densities at lower altitudes decrease, following this heating episode. Substantial O+ outfluxes are found indicating that the SED-associated O+ ions acquire sufficient energy to reach higher altitudes after the effects of transverse wave heating. O+ outfluxes of 2-3.5 × 108 cm-2 s-1 persist for more than 90 minutes during the simulation episode considered. The simulation results indicate that SED can be a significant source for the cleft ion fountain, and thus in turn, O+ ions to the magnetosphere.

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