Alfvén Ion Cyclotron Waves in Sheath Regions Driven by Interplanetary Coronal Mass Ejections

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dc.contributor.author Ala-Lahti, Matti
dc.contributor.author Kilpua, Emilia K. J.
dc.contributor.author Soucek, Jan
dc.contributor.author Pulkkinen, Tuija
dc.contributor.author Dimmock, Andrew P.
dc.date.accessioned 2019-09-03T06:35:03Z
dc.date.available 2019-09-03T06:35:03Z
dc.date.issued 2019-06
dc.identifier.citation Ala-Lahti , M , Kilpua , E K J , Soucek , J , Pulkkinen , T & Dimmock , A P 2019 , ' Alfvén Ion Cyclotron Waves in Sheath Regions Driven by Interplanetary Coronal Mass Ejections ' , Journal of geophysical research. Space physics , vol. 124 , no. 6 , pp. 3893-3909 . https://doi.org/10.1029/2019JA026579
dc.identifier.other PURE: 126214175
dc.identifier.other PURE UUID: 442f7146-d60e-43d5-847f-e994dcf5abfb
dc.identifier.other WOS: 000477723100004
dc.identifier.other ORCID: /0000-0002-4489-8073/work/61593818
dc.identifier.other ORCID: /0000-0001-9574-339X/work/61593951
dc.identifier.uri http://hdl.handle.net/10138/305158
dc.description.abstract We report on a statistical analysis of the occurrence and properties of Alfven ion cyclotron (AIC) waves in sheath regions driven by interplanetary coronal mass ejections (ICMEs). We have developed an automated algorithm to identify AIC wave events from magnetic field data and apply it to investigate 91 ICME sheath regions recorded by the Wind spacecraft. Our analysis focuses on waves generated by the ion cyclotron instability. AIC waves are observed to be frequent structures in ICME-driven sheaths, and their occurrence is the highest in the vicinity of the shock. Together with previous studies, our results imply that the shock compression has a crucial role in generating wave activity in ICME sheaths. AIC waves tend to have their frequency below the ion cyclotron frequency, and, in general, occur in plasma that is stable with respect to the ion cyclotron instability and has lower ion beta(parallel to) than mirror modes. The results suggest that the ion beta anisotropy beta(perpendicular to)/beta(parallel to) > 1 appearing in ICME sheaths is regulated by both ion cyclotron and mirror instabilities. en
dc.format.extent 17
dc.language.iso eng
dc.relation.ispartof Journal of geophysical research. Space physics
dc.rights gnu_lgpl
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject LOW-FREQUENCY WAVES
dc.subject TEMPERATURE ANISOTROPY
dc.subject EARTHS MAGNETOSHEATH
dc.subject MIRROR INSTABILITY
dc.subject MAGNETIC CLOUDS
dc.subject FLUX-ROPE
dc.subject ORIGIN
dc.subject SHOCKS
dc.subject CMES
dc.subject FLUCTUATIONS
dc.subject 115 Astronomy, Space science
dc.title Alfvén Ion Cyclotron Waves in Sheath Regions Driven by Interplanetary Coronal Mass Ejections en
dc.type Article
dc.contributor.organization Particle Physics and Astrophysics
dc.contributor.organization Space Physics Research Group
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1029/2019JA026579
dc.relation.issn 2169-9380
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

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