Fatemi, S; Poppe, A R; Vorburger, A; Lindkvist, J; Hamrin, M (2022). Ion Dynamics at the Magnetopause of Ganymede. Journal of Geophysical Research: Space Physics, 127(1), e2021JA029863. AGU Publications 10.1029/2021JA029863
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JGR_Space_Physics_-_2022_-_Fatemi_-_Ion_Dynamics_at_the_Magnetopause_of_Ganymede.pdf - Published Version Available under License Creative Commons: Attribution-Noncommercial (CC-BY-NC). Download (5MB) | Preview |
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 ( 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.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute 08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences |
UniBE Contributor: |
Vorburger, Audrey Helena |
Subjects: |
500 Science > 530 Physics 500 Science > 520 Astronomy 600 Technology > 620 Engineering |
ISSN: |
2169-9380 |
Publisher: |
AGU Publications |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
25 Jul 2022 08:43 |
Last Modified: |
05 Dec 2022 16:22 |
Publisher DOI: |
10.1029/2021JA029863 |
PubMed ID: |
35865030 |
Uncontrolled Keywords: |
Ganymede hybrid simulations magnetic reconnection magnetopause plasma energization plasma interaction |
BORIS DOI: |
10.48350/171502 |
URI: |
https://boris.unibe.ch/id/eprint/171502 |
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