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Magnetosheath jet properties and evolution as determined by a global hybrid-Vlasov simulation
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2018 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 36, no 5, p. 1171-1182Article in journal (Refereed) Published
Abstract [en]

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 in SI units 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 through the magnetosheath. 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 from the bow shock by ∼ 2.6 RE, while its size perpendicular to the direction of propagation is ∼ 0.5R/E. We also investigate the jet evolution and find that the jet originates due to the interaction of the bow shock with a high-dynamic-pressure structure that reproduces observational features associated with a short, large-amplitude magnetic structure (SLAMS). The simulation shows that magnetosheath jets can develop also under steady IMF, as inferred by observational studies. To our knowledge, this paper therefore shows the first global kinetic simulation of a magnetosheath jet, which is in accordance with three observational jet criteria and is caused by a SLAMS advecting towards the bow shock. 

Place, publisher, year, edition, pages
Copernicus GmbH , 2018. Vol. 36, no 5, p. 1171-1182
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-236698DOI: 10.5194/angeo-36-1171-2018ISI: 000444098700001Scopus ID: 2-s2.0-85053271559OAI: oai:DiVA.org:kth-236698DiVA, id: diva2:1262456
Note

Export Date: 22 October 2018; Article; Correspondence Address: Palmroth, M.; Department of Physics, University of HelsinkiFinland; email: minna.palmroth@helsinki.fi; Funding details: IA104416; Funding details: 704681; Funding details: CSC, China Scholarship Council; Funding details: NNX17AI45G; Funding details: 309937; Funding details: 267144; Funding details: 312351; Funding details: 682068-PRESTISSIMO, ERC, European Research Council; Funding details: 200141-QuESpace, ERC, European Research Council; Funding text: Acknowledgements. We acknowledge the European Research Council for Starting grant 200141-QuESpace, with which Vlasiator (http://helsinki.fi/vlasiator; last access: 4 September 2018) was developed, and Consolidator grant 682068-PRESTISSIMO awarded to further develop Vlasiator and use it for scientific investigations. We gratefully also acknowledge the Finnish Centre of Excellence in Research of Sustainable Space (Academy of Finland grant numbers 312351, 267144, and 309937). Primož Kajdicˇ’s work was supported by DGAPA/PAPIIT grant IA104416. The CSC – IT Center for Science in Finland is acknowledged for the Grand Challenge award leading to the results shown in here. We acknowledge valuable discussions within the International Space Science Institute (ISSI) team 350, called “Jets downstream of collisionless shocks”, led by Ferdinand Plaschke and Heli Hietala. Lucile Turc acknowledges Marie Sklodowska-Curie grant 704681. Heli Hietala was supported by the Turku Collegium for Science and Medicine and NASA NNX17AI45G. We thank Jonas Suni for producing data for the figures in the revised version. QC 20181112

Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2018-11-12Bibliographically approved

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