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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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  15 Jul 2020

15 Jul 2020

Review status: this preprint is currently under review for the journal ANGEO.

Magnetosheath jet evolution as a function of lifetime: Global hybrid-Vlasov simulations compared to MMS observations

Minna Palmroth1,2, Savvas Raptis3, Jonas Suni1, Tomas Karlsson3, Lucile Turc1, Andreas Johlander1, Urs Ganse1, Yann Pfau-Kempf1, Xochitl Blanco-Cano4, Mojtaba Akhavan-Tafti5, Markus Battarbee1, Maxime Dubart1, Maxime Grandin1, Vertti Tarvus1, and Adnane Osmane1 Minna Palmroth et al.
  • 1Department of Physics, University of Helsinki, Helsinki, Finland
  • 2Space and Earth Observation Centre, Finnish Meteorological Institute, Helsinki, Finland
  • 3KTH Royal Institute of Technology, Stockholm, Sweden
  • 4Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico
  • 5Climate and Space Science and Engineering, University of Michigan, Ann Arbor, USA

Abstract. Magnetosheath jets are regions of high dynamic pressure, which traverse from the bow shock towards the magnetopause. Recent modelling efforts, limited to a single jet and a single set of upstream conditions, have provided the first estimations about how the jet parameters behave as a function of position within the magnetosheath. Here we expand the earlier results by making the first statistical investigation of the jet dimensions and parameters as a function of their lifetime within the magnetosheath. To verify the simulation behaviour, we first identify jets from Magnetosphere Multi-Scale (MMS) spacecraft data (6142 in total) and confirm the Vlasiator jet general behaviour using a statistics of 924 simulated individual jets. We find that the jets in the simulation are in excellent quantitative agreement with the observations, confirming earlier findings related to jets using Vlasiator. The jet density, dynamic pressure and magnetic field intensity show a sharp jump at the bow shock, which decreases towards the magnetopause. The jets appear compressive and cooler than the magnetosheath at the bow shock, while during their propagation towards the magnetopause they thermalise. Further, the shape of the jets flatten as they progress through the magnetosheath. Finally, we find that Vlasiator jets during low solar wind Alfvén Mach number MA are shorter in duration, smaller in their extent, and weaker in terms of dynamic pressure and magnetic field intensity as compared to the jets during high MA.

Minna Palmroth et al.

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Minna Palmroth et al.

Minna Palmroth et al.


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