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@article{Palmroth:2018:10.5194/angeo-2018-20,
author = {Palmroth, M and Hietala, H and Plaschke, F and Archer, M and Karlsson, T and Blanco-Cano, X and Sibeck, D and Kajdi, P and Ganse, U and Pfau-Kempf, Y and Battarbee, M and Turc, L},
doi = {10.5194/angeo-2018-20},
journal = {Annales Geophysicae: atmospheres, hydrospheres and space sciences},
pages = {1171--1182},
title = {Magnetosheath jet properties and evolution as determined by a global hybrid-Vlasov simulation},
url = {http://dx.doi.org/10.5194/angeo-2018-20},
volume = {36},
year = {2018}
}

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TY  - JOUR
AB  - Abstract. We use a global hybrid-Vlasov simulation for the magnetosphere, Vlasiator, to investigate magnetosheath high-speed jets. Unlike many other hybrid-kinetic simulations, Vlasiator includes an unscaled geomagnetic dipole, indicating that the simulation spatial and temporal dimensions can be given without scaling. Thus, for the first time, this allows investigating the magnetosheath jet properties and comparing them directly with the observed jets within the Earth's magnetosheath. In the run shown in this paper, the interplanetary magnetic field (IMF) cone angle is 30°, and a foreshock develops upstream of the quasi-parallel magnetosheath. We visually detect a structure with high dynamic pressure propagating from the bow shock towards the magnetopause. The structure is confirmed as a jet using three different criteria, which have been adopted in previous observational studies. We compare these criteria against the simulation results. We find that the magnetosheath jet is an elongated structure extending Earthward of the bow shock by ~ 2.3 RE, while its size perpendicular to the direction of propagation is ~ 0.5 RE. We also investigate the jet evolution, and find that the jet originates due to the interaction of the foreshock Ultra Low Frequency (ULF) waves with the bow shock surface. The simulation shows that magnetosheath jets can develop also under steady IMF, as inferred by observational studies.
AU  - Palmroth,M
AU  - Hietala,H
AU  - Plaschke,F
AU  - Archer,M
AU  - Karlsson,T
AU  - Blanco-Cano,X
AU  - Sibeck,D
AU  - Kajdi,P
AU  - Ganse,U
AU  - Pfau-Kempf,Y
AU  - Battarbee,M
AU  - Turc,L
DO  - 10.5194/angeo-2018-20
EP  - 1182
PY  - 2018///
SN  - 0992-7689
SP  - 1171
TI  - Magnetosheath jet properties and evolution as determined by a global hybrid-Vlasov simulation
T2  - Annales Geophysicae: atmospheres, hydrospheres and space sciences
UR  - http://dx.doi.org/10.5194/angeo-2018-20
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000444098700001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://angeo.copernicus.org/preprints/angeo-2018-20/angeo-2018-20.pdf
UR  - http://hdl.handle.net/10044/1/83317
VL  - 36
ER  -

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