Hybrid modeling of cometary plasma environments: II. Remote-sensing of a cometary bow shock

dc.contributorAalto Universityen
dc.contributor.authorAlho, Markkuen_US
dc.contributor.authorSimon Wedlund, Cyrilen_US
dc.contributor.authorNilsson, Hansen_US
dc.contributor.authorKallio, Esaen_US
dc.contributor.authorJärvinen, Rikuen_US
dc.contributor.authorPulkkinen, Tuijaen_US
dc.contributor.departmentDepartment of Electronics and Nanoengineeringen
dc.contributor.groupauthorEsa Kallio Groupen
dc.contributor.groupauthorTuija Pulkkinen Groupen
dc.contributor.organizationSwedish Institute of Space Physicsen_US
dc.contributor.organizationUniversity of Osloen_US
dc.description.abstractContext. The ESA Rosetta probe has not seen direct evidence of a fully formed bow shock at comet 67P/Churyumov-Gerasimenko (67P). Ion spectrometer measurements of cometary pickup ions measured in the vicinity of the nucleus of 67P are available and may contain signatures of the large-scale plasma environment. Aims. The aim is to investigate the possibility of using pickup ion signatures to infer the existence or nonexistence of a bow shock-like structure and possibly other large-scale plasma environment features. Methods. A numerical plasma model in the hybrid plasma description was used to model the plasma environment of a comet. Simulated pickup ion spectra were generated for different interplanetary magnetic field conditions. The results were interpreted through test particle tracing in the hybrid simulation solutions. Results. Features of the observed pickup ion energy spectrum were reproduced, and the model was used to interpret the observation to be consistent with a shock-like structure. We identify (1) a spectral break related to the bow shock, (2) a mechanism for generating the spectral break, and (3) a dependency of the energy of the spectral break on the interplanetary magnetic field magnitude and bow shock standoff distance.en
dc.description.versionPeer revieweden
dc.identifier.citationAlho, M, Simon Wedlund, C, Nilsson, H, Kallio, E, Järvinen, R & Pulkkinen, T 2019, ' Hybrid modeling of cometary plasma environments : II. Remote-sensing of a cometary bow shock ', Astronomy & Astrophysics, vol. 630, A45 . https://doi.org/10.1051/0004-6361/201834863en
dc.identifier.otherPURE UUID: 81f189a2-995d-4e16-b67e-89a962a5ab9ben_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/81f189a2-995d-4e16-b67e-89a962a5ab9ben_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85097198795&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/32845864/ELEC_alho_Hybrid_modeling_AA.pdfen_US
dc.publisherEDP SCIENCES S A
dc.relation.ispartofseriesAstronomy & Astrophysicsen
dc.subject.keywordComets: generalen_US
dc.subject.keywordComets: individual: 67P/Churyumov-Gerasimenkoen_US
dc.subject.keywordMethods: numericalen_US
dc.subject.keywordShock wavesen_US
dc.subject.keywordTechniques: miscellaneousen_US
dc.titleHybrid modeling of cometary plasma environments: II. Remote-sensing of a cometary bow shocken
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi