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Vlasiator hybrid-Vlasov simulation of the magnetosphere under southward IMF in the polar plane

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Title Vlasiator hybrid-Vlasov simulation of the magnetosphere under southward IMF in the polar plane
Author Pfau-Kempf, Yann
License CC Attribution 3.0 Germany:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
DOI 10.5446/20474
Publisher Copernicus Publications
Release Date 2016
Language Silent film

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Subject Area Physics
Abstract We present a scenario resulting in time-dependent behaviour of the bow shock and transient, local ion reflection under unchanging solar wind conditions. Dayside magnetopause reconnection produces flux transfer events driving fast-mode wave fronts in the magnetosheath. These fronts push out the bow shock surface due to their increased downstream pressure. The resulting bow shock deformations lead to a configuration favourable to localised ion reflection and thus the formation of transient, travelling foreshock-like field-aligned ion beams. This is identified in two-dimensional global magnetospheric hybrid-Vlasov simulations of the Earth's magnetosphere performed using the Vlasiator model (s.url). We also present observational data showing the occurrence of dayside reconnection and flux transfer events at the same time as Geotail observations of transient foreshock-like field-aligned ion beams. The spacecraft is located well upstream of the foreshock edge and the bow shock, during steady southward interplanetary magnetic field and in the absence of any solar wind or interplanetary magnetic field perturbations. This indicates the formation of such localised ion foreshocks.
Keywords Vlasiator
plasma
simulation
hybrid-Vlasov
magnetosphere
solar wind
IMF
foreshock
dayside reconnection
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