Test particle simulations of the effect of moving DLs on ion outflow in the auroral downward-current region

Details Test particle simulations of the effect of moving DLs on ion outflow in the auroral downward-current region Test particle simulations of the effect of moving DLs on ion outflow in the auroral downward-current region

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11301308h&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A1, CiteID A01308

Physics

4

Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Energetic Particles: Trapped, Magnetospheric Physics: Electric Fields (2411)

Scientific paper

Test particle simulations of ion outflow in the auroral downward-current region are carried out to investigate the effect of a series of highly localized, moving double layers. Double layers (DLs) have been observed in the downward-current region, but may not be the only source of electron acceleration. However, when present, they may dramatically affect ion outflow. In the simulation the double layers (DLs) move anti-earthward along the magnetic field (B) at the ion-acoustic speed and are assigned a perpendicular ion heating profile along B that moves with them. The DL speed and the associated ion heating profile are based on in situ observations and dynamic simulations. This configuration greatly changes the mechanism of the ion outflow in the downward-current region from the classical ion-pressure cooker picture. In the moving DL model, a majority of out-flowing ions do not pass through the DL. Instead, the ions tend to be pushed in front of a DL or trapped between two DLs which enforce outward motion and result in a significant increase in net number and energy fluxes of upgoing ions. The ion distributions from the simulations compare well to FAST observations as a function of the relative distance from the DL position along B.

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