Large-scale modeling of ionospheric ion beams observed by Cluster in the auroral region

Details Large-scale modeling of ionospheric ion beams observed by Cluster in the auroral region Large-scale modeling of ionospheric ion beams observed by Cluster in the auroral region

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm31a..06a&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM31A-06

Physics

2706 Cusp, 2724 Magnetopause And Boundary Layers, 2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2764 Plasma Sheet

Scientific paper

Cluster spacecraft observations in the plasma sheet boundary layer (PSBL) on the outbound (northern hemisphere) pass on February 14, 2001 show successive energy-dispersed structures that appear to be echoes of an initial structure observed by the spacecraft, but are detected poleward of the initial structure. The dispersion of these structures is very different from that observed by the spacecraft in the southern hemisphere just three hours earlier. We began our analysis of this event by running a global magnetohydrodynamic (MHD) simulation driven by upstream solar wind and interplanetary magnetic field data. We then traced distributions of ions forward in time in the time-dependent electric and magnetic fields obtained from the global MHD simulation. A localized and energetic (5-10 keV) source of field-aligned upgoing H+ ions in the ionosphere observed by all four Cluster spacecraft just above the auroral acceleration region was used as our source for the particle tracing calculations. We found that the upflowing ionospheric ions encountered the magnetotail current sheet in a region of tailward convection and returned to the Cluster location poleward of the latitude at which they were launched. Thus, the ionospheric source was found in fact to be a plausible source of the echoes observed by the Cluster spacecraft.

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