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Discussion papers | Copyright
https://doi.org/10.5194/angeo-2018-20
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 08 Mar 2018

Regular paper | 08 Mar 2018

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Annales Geophysicae (ANGEO).

Magnetosheath jet properties and evolution as determined by a global hybrid-Vlasov simulation

Minna Palmroth1,2, Heli Hietala3, Ferdinand Plaschke4,5, Martin Archer6,7, Tomas Karlsson8, Xóchitl Blanco-Cano9, David Sibeck10, Primož Kajdič9, Urs Ganse1, Yann Pfau-Kempf1, Markus Battarbee1, and Lucile Turc1 Minna Palmroth et al.
  • 1University of Helsinki, Helsinki, Finland
  • 2Finnish Meteorological Institute, Helsinki, Finland
  • 3University of California, Los Angeles, USA
  • 4Institute of Physics, University of Graz, Graz, Austria
  • 5Space Research Institute, Austrian Academy of Sciences, Graz, Austria
  • 6The Blackett Laboratory, Imperial College London, London, UK
  • 7Queen Mary University of London, London, UK
  • 8Swedish Institute for Space Physics, Uppsala, Sweden
  • 9Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, Mexico
  • 10Code 674, NASA/GSFC, Greenbelt, MD, USA

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.

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