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Driving ionospheric outflows and magnetospheric O + energy density with Alfv\ en waves


AuthorChaston, C.; Bonnell, J.; Reeves, G.; Skoug, R.;
KeywordsAlfven waves; ion acceleration; Ionosphere; ionospheric outflow; ring current
AbstractWe show how dispersive Alfv\ en waves observed in the inner magnetosphere during geomagnetic storms can extract O+ ions from the topside ionosphere and accelerate these ions to energies exceeding 50 keV in the equatorial plane. This occurs through wave trapping, a variant of \textquotedblleftshock\textquotedblright surfing, and stochastic ion acceleration. These processes in combination with the mirror force drive field-aligned beams of outflowing ionospheric ions into the equatorial plane that evolve to provide energetic O+ distributions trapped near the equator. These waves also accelerate preexisting/injected ion populations on the same field lines. We show that the action of dispersive Alfv\ en waves over several minutes may drive order of magnitude increases in O+ ion pressure to make substantial contributions to magnetospheric ion energy density. These wave accelerated ions will enhance the ring current and play a role in the storm time evolution of the magnetosphere.
Year of Publication2016
JournalGeophysical Research Letters
Volume43
Number of Pages4825-4833
Section
Date Published05/2016
ISBN
URLhttp://doi.wiley.com/10.1002/2016GL069008
DOI10.1002/2016GL069008