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Electron Signatures of Reconnection in a Global eVlasiator Simulation
Univ Helsinki, Dept Phys, Helsinki, Finland..
Univ Helsinki, Dept Phys, Helsinki, Finland..
Univ Helsinki, Dept Phys, Helsinki, Finland..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0001-5550-3113
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2022 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 49, no 14, article id e2022GL098329Article in journal (Refereed) Published
Abstract [en]

Geospace plasma simulations have progressed toward more realistic descriptions of the solar wind-magnetosphere interaction from magnetohydrodynamic to hybrid ion-kinetic, such as the state-of-the-art Vlasiator model. Despite computational advances, electron scales have been out of reach in a global setting. eVlasiator, a novel Vlasiator submodule, shows for the first time how electromagnetic fields driven by global hybrid-ion kinetics influence electrons, resulting in kinetic signatures. We analyze simulated electron distributions associated with reconnection sites and compare them with Magnetospheric Multiscale (MMS) spacecraft observations. Comparison with MMS shows that key electron features, such as reconnection inflows, heated outflows, flat-top distributions, and bidirectional streaming, are in remarkable agreement. Thus, we show that many reconnection-related features can be reproduced despite strongly truncated electron physics and an ion-scale spatial resolution. Ion-scale dynamics and ion-driven magnetic fields are shown to be significantly responsible for the environment that produces electron dynamics observed by spacecraft in near-Earth plasmas.

Place, publisher, year, edition, pages
American Geophysical Union (AGU) American Geophysical Union (AGU), 2022. Vol. 49, no 14, article id e2022GL098329
Keywords [en]
kinetic simulation, reconnection, electron distribution function, magnetosphere, vlasov equation, electric field
National Category
Fusion, Plasma and Space Physics Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-481813DOI: 10.1029/2022GL098329ISI: 000828570600001OAI: oai:DiVA.org:uu-481813DiVA, id: diva2:1688044
Funder
EU, European Research Council, 682068-PRESTISSIMOEU, Horizon 2020, 704681Available from: 2022-08-17 Created: 2022-08-17 Last updated: 2024-01-15Bibliographically approved

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Khotyaintsev, Yuri V.

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