Learning Centre

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

 |  Login

Show simple item record

dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Ala-Lahti, Matti
dc.contributor.author Kilpua, Emilia K.J.
dc.contributor.author Souček, Jan
dc.contributor.author Pulkkinen, Tuija I.
dc.contributor.author Dimmock, Andrew P.
dc.date.accessioned 2019-08-15T08:23:01Z
dc.date.available 2019-08-15T08:23:01Z
dc.date.issued 2019-06-01
dc.identifier.citation Ala-Lahti , M , Kilpua , E K J , Souček , J , Pulkkinen , T I & 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 en
dc.identifier.issn 2169-9380
dc.identifier.issn 2169-8996
dc.identifier.other PURE UUID: 4e883965-86ab-405a-a929-da01c09f5e6d
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/4e883965-86ab-405a-a929-da01c09f5e6d
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85067389484&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/35746563/ELEC_Ala_Lahti_et_al_2019_Journal_of_Geophysical_Research_Space_Physics.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/39669
dc.description.abstract We report on a statistical analysis of the occurrence and properties of Alfvén 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 β‖ than mirror modes. The results suggest that the ion beta anisotropy β⊥/β‖>1 appearing in ICME sheaths is regulated by both ion cyclotron and mirror instabilities. en
dc.format.extent 17
dc.format.extent 3893-3909
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Journal of Geophysical Research: Space Physics en
dc.relation.ispartofseries Volume 124, issue 6 en
dc.rights openAccess en
dc.title Alfvén Ion Cyclotron Waves in Sheath Regions Driven by Interplanetary Coronal Mass Ejections en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department University of Helsinki
dc.contributor.department Czech Academy of Sciences
dc.contributor.department Department of Electronics and Nanoengineering
dc.contributor.department Uppsala University
dc.identifier.urn URN:NBN:fi:aalto-201908154714
dc.identifier.doi 10.1029/2019JA026579
dc.date.embargo info:eu-repo/date/embargoEnd/2019-11-22

Files in this item

Files Size Format View

There are no open access files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search archive

Advanced Search

article-iconSubmit a publication