Evidence for transient, local ion foreshocks caused by dayside magnetopause reconnection

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Title: Evidence for transient, local ion foreshocks caused by dayside magnetopause reconnection
Authors: Pfau-Kempf, Y
Hietala, H
Milan, SE
Juusola, L
Hoilijoki, S
Ganse, U
Von Alfthan, S
Palmroth, M
Item Type: Journal Article
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.
Issue Date: 4-Nov-2016
Date of Acceptance: 17-Oct-2016
URI: http://hdl.handle.net/10044/1/72406
DOI: https://creativecommons.org/licenses/by/3.0/10.5194/angeo-34-943-2016
ISSN: 0992-7689
Publisher: Copernicus Publications
Start Page: 943
End Page: 959
Journal / Book Title: Annales Geophysicae
Volume: 34
Issue: 11
Copyright Statement: © Author(s) 2016. CC Attribution 3.0 License (https://creativecommons.org/licenses/by/3.0/).
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Geosciences, Multidisciplinary
Meteorology & Atmospheric Sciences
Geology
Interplanetary physics (planetary bow shocks)
magnetospheric physics (magnetosheath; solar wind-magnetosphere interactions)
FLUX-TRANSFER EVENTS
EARTHS BOW SHOCK
INTERPLANETARY MAGNETIC-FIELD
HIGH-LATITUDE MAGNETOPAUSE
ELEMENTARY CURRENT SYSTEMS
HYBRID-VLASOV SIMULATION
WIND SPACECRAFT
THEMIS OBSERVATIONS
CLUSTER SPACECRAFT
RADAR OBSERVATIONS
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Geosciences, Multidisciplinary
Meteorology & Atmospheric Sciences
Geology
Interplanetary physics (planetary bow shocks)
magnetospheric physics (magnetosheath; solar wind-magnetosphere interactions)
FLUX-TRANSFER EVENTS
EARTHS BOW SHOCK
INTERPLANETARY MAGNETIC-FIELD
HIGH-LATITUDE MAGNETOPAUSE
ELEMENTARY CURRENT SYSTEMS
HYBRID-VLASOV SIMULATION
WIND SPACECRAFT
THEMIS OBSERVATIONS
CLUSTER SPACECRAFT
RADAR OBSERVATIONS
Meteorology & Atmospheric Sciences
0401 Atmospheric Sciences
0404 Geophysics
0201 Astronomical and Space Sciences
Publication Status: Published
Online Publication Date: 2016-11-04
Appears in Collections:Space and Atmospheric Physics
Physics
Faculty of Natural Sciences



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