Tail reconnection in the global magnetospheric context : Vlasiator first results

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Palmroth , M , Hoilijoki , S , Juusola , L , Pulkkinen , T I , Hietala , H , Pfau-Kempf , Y , Ganse , U , von Alfthan , S , Vainio , R & Hesse , M 2017 , ' Tail reconnection in the global magnetospheric context : Vlasiator first results ' , Annales Geophysicae , vol. 35 , no. 6 , pp. 1269-1274 . https://doi.org/10.5194/angeo-35-1269-2017

Title: Tail reconnection in the global magnetospheric context : Vlasiator first results
Author: Palmroth, Minna; Hoilijoki, Sanni; Juusola, Liisa; Pulkkinen, Tuija I.; Hietala, Heli; Pfau-Kempf, Yann; Ganse, Urs; von Alfthan, Sebastian; Vainio, Rami; Hesse, Michael
Other contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, University of Turku

Date: 2017-11-28
Language: eng
Number of pages: 6
Belongs to series: Annales Geophysicae
ISSN: 0992-7689
DOI: https://doi.org/10.5194/angeo-35-1269-2017
URI: http://hdl.handle.net/10138/231767
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.
Subject: Magnetospheric physics
magnetotail
plasma sheet
space plasma physics
magnetic reconnection
INTERPLANETARY MAGNETIC-FIELD
EARTHS MAGNETOTAIL
MHD SIMULATION
FLUX ROPES
MAGNETOSHEATH
FORESHOCK
SUBSTORM
FRONTS
SHEET
114 Physical sciences
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