Tail reconnection in the global magnetospheric context: Vlasiator first results

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Title: Tail reconnection in the global magnetospheric context: Vlasiator first results
Authors: Palmroth, M
Hoilijoki, S
Juusola, L
Pulkkinen, TI
Hietala, H
Pfau-Kempf, Y
Ganse, U
Von Alfthan, S
Vainio, R
Hesse, M
Item Type: Journal Article
Abstract: The key dynamics of the magnetotail have been researched for decades and have been associated with either three-dimensional (3-D) plasma instabilities and/or magnetic reconnection. We apply a global hybrid-Vlasov code, Vlasiator, to simulate reconnection self-consistently in the ion kinetic scales in the noon–midnight meridional plane, including both dayside and nightside reconnection regions within the same simulation box. Our simulation represents a numerical experiment, which turns off the 3-D instabilities but models ion-scale reconnection physically accurately in 2-D. We demonstrate that many known tail dynamics are present in the simulation without a full description of 3-D instabilities or without the detailed description of the electrons. While multiple reconnection sites can coexist in the plasma sheet, one reconnection point can start a global reconfiguration process, in which magnetic field lines become detached and a plasmoid is released. As the simulation run features temporally steady solar wind input, this global reconfiguration is not associated with sudden changes in the solar wind. Further, we show that lobe density variations originating from dayside reconnection may play an important role in stabilising tail reconnection.
Issue Date: 28-Nov-2017
Date of Acceptance: 24-Oct-2017
URI: http://hdl.handle.net/10044/1/72407
DOI: https://creativecommons.org/licenses/by/4.0/10.5194/angeo-35-1269-2017
ISSN: 0992-7689
Publisher: Copernicus Publications
Start Page: 1269
End Page: 1274
Journal / Book Title: Annales Geophysicae
Volume: 35
Issue: 6
Copyright Statement: © Author(s) 2017. This work is distributed under the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/).
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Geosciences, Multidisciplinary
Meteorology & Atmospheric Sciences
Geology
Magnetospheric physics
magnetotail
plasma sheet
space plasma physics
magnetic reconnection
INTERPLANETARY MAGNETIC-FIELD
EARTHS MAGNETOTAIL
MHD SIMULATION
FLUX ROPES
MAGNETOSHEATH
FORESHOCK
SUBSTORM
FRONTS
SHEET
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Geosciences, Multidisciplinary
Meteorology & Atmospheric Sciences
Geology
Magnetospheric physics
magnetotail
plasma sheet
space plasma physics
magnetic reconnection
INTERPLANETARY MAGNETIC-FIELD
EARTHS MAGNETOTAIL
MHD SIMULATION
FLUX ROPES
MAGNETOSHEATH
FORESHOCK
SUBSTORM
FRONTS
SHEET
Meteorology & Atmospheric Sciences
0401 Atmospheric Sciences
0404 Geophysics
0201 Astronomical and Space Sciences
Publication Status: Published
Online Publication Date: 2017-11-28
Appears in Collections:Space and Atmospheric Physics
Physics
Faculty of Natural Sciences



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