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Ion Dynamics at the Magnetopause of Ganymede
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-9450-6672
Space Sciences Laboratory, University of California at Berkeley, CA, Berkeley, United States.
Umeå University, Faculty of Science and Technology, Department of Physics. Physics Institute, University of Bern, Bern, Switzerland.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-5765-2806
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2022 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 127, no 1, article id e2021JA029863Article in journal (Refereed) Published
Abstract [en]

We study the dynamics of the thermal O+ and H+ ions at Ganymede's magnetopause when Ganymede is inside and outside of the Jovian plasma sheet using a three-dimensional hybrid model of plasma (kinetic ions, fluid electrons). We present the global structure of the electric fields and power density (E ⋅ J) in the magnetosphere of Ganymede and show that the power density at the magnetopause is mainly positive and on average is +0.95 and +0.75 nW/m3 when Ganymede is inside and outside the Jovian plasma sheet, respectively, but locally it reaches over +20 nW/m3. Our kinetic simulations show that ion velocity distributions at the vicinity of the upstream magnetopause of Ganymede are highly non-Maxwellian. We investigate the energization of the ions interacting with the magnetopause and find that the energy of those particles on average increases by a factor of 8 and 30 for the O+ and H+ ions, respectively. The energy of these ions is mostly within 1–100 keV for both species after interaction with the magnetopause, but a few percentages reach to 0.1–1 MeV. Our kinetic simulations show that a small fraction ((Formula presented.) 25%) of the corotating Jovian plasma reach the magnetopause, but among those >50% cross the high-power density regions at the magnetopause and gain energy. Finally, we compare our simulation results with Galileo observations of Ganymede's magnetopause crossings (i.e., G8 and G28 flybys). There is an excellent agreement between our simulations and observations, particularly our simulations fully capture the size and structure of the magnetosphere.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022. Vol. 127, no 1, article id e2021JA029863
Keywords [en]
Ganymede, hybrid simulations, magnetic reconnection, magnetopause, plasma energization, plasma interaction
National Category
Astronomy, Astrophysics and Cosmology Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-192669DOI: 10.1029/2021JA029863ISI: 000759550200009Scopus ID: 2-s2.0-85124389060OAI: oai:DiVA.org:umu-192669DiVA, id: diva2:1639297
Funder
Swedish National Space Board, 179/18Swedish National Space Board, 115/18Swedish Research Council, 2018-03 454The Royal Swedish Academy of Sciences, AST2020- 0011Swedish National Infrastructure for Computing (SNIC)Available from: 2022-02-21 Created: 2022-02-21 Last updated: 2023-09-05Bibliographically approved

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Fatemi, ShahabVorburger, AudreyLindkvist, JesperHamrin, Maria

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