0519282 - ASÚ 2020 RIV US eng J - Journal Article
Šebek, Ondřej - Trávníček, Pavel M. - Walker, R. - Hellinger, Petr
Dynamic Plasma Interaction at Io: Multispecies Hybrid Simulations.
Journal of Geophysical Research-Space Physics. Roč. 124, č. 1 (2019), s. 313-341. ISSN 2169-9380. E-ISSN 2169-9402
R&D Projects: GA ČR(CZ) GA17-08857S
Institutional support: RVO:67985815
Keywords : electron-impact ionization * recommended data * MHD simulations
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 2.799, year: 2019
Method of publishing: Open access

We present analysis of an extensive simulation campaign of the Io plasma interaction under varying interaction conditions performed by using a hybrid multispecies simulation model. We test two models of electron impact ionization, one resulting in plasma production constrained to the upstream hemisphere of Io and the other producing a more symmetric distribution of the plasma with nonnegligible plasma production on the downstream side of To. In the latter case, the simulation model provides high level of agreement with Galileo measurements of magnetic field obtained during the IO flyby, where the model captures even smaller-scale features of the magnetic field profile. Our simulated results provide strong support for the existence of Io's induced dipole field. In this model we assume that induced dipole field moment is antiparallel to the direction of the inducing magnetic field, equivalent to induction in a highly conductive Io. Our results further support the idea that Io's atmosphere collapsed during the Galileo 127 flyby, which manifests itself in the lack of ion heating due to pickup processes in the extended atmosphere.
Permanent Link: http://hdl.handle.net/11104/0304281