Evidence for transient, local ion foreshocks caused by dayside magnetopause reconnection
書誌事項
- 公開日
- 2016-11-04
- 権利情報
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- https://creativecommons.org/licenses/by/3.0/
- DOI
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- 10.5194/angeo-34-943-2016
- 公開者
- Copernicus GmbH
説明
<jats:p>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 localized 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 (http://vlasiator.fmi.fi). 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 a steady southward interplanetary magnetic field and in the absence of any solar wind or interplanetary magnetic field perturbations. This indicates the formation of such localized ion foreshocks. </jats:p>
収録刊行物
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- Annales Geophysicae
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Annales Geophysicae 34 (11), 943-959, 2016-11-04
Copernicus GmbH
