Physics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3621104h&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 21, CiteID L21104
Physics
1
Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Ionosphere: Wave/Particle Interactions (7867), Magnetospheric Physics: Auroral Phenomena (2407), Ionosphere: Particle Acceleration, Ionosphere: Plasma Waves And Instabilities (2772)
Scientific paper
Vlasov simulations have been performed to investigate the development and evolution of the parallel potential drop, often structured as a localized double layer (DL), electron phase-space holes, and ion perpendicular heating, resulting in ion outflow in the auroral downward-current region. We focus on the feedback between a moving DL and heated ions, suggesting a self-consistent model: the heated ions regulate the evolution of the DL which controls the level of ion heating and, consequently, the outflow rate. Strongly heated ions forming conics are found in agreement with in-situ observations. The intensification and widening of the DL develops with time, and the DL eventually weakens due to a reduction in the background population resulting from excessive ion heating.
Andersson L.-L.
Ergun Robert E.
Hwang J. K.
Newman D. L.
Tao J. B.
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