Outer Van Allen Radiation Belt Response to Interacting Interplanetary Coronal Mass Ejections

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dc.contributor.author Kilpua, E. K. J.
dc.contributor.author Turner, D. L.
dc.contributor.author Jaynes, A.
dc.contributor.author Hietala, H.
dc.contributor.author Koskinen, H. E. J.
dc.contributor.author Osmane, A.
dc.contributor.author Palmroth, M.
dc.contributor.author Pulkkinen, T. I.
dc.contributor.author Vainio, R.
dc.contributor.author Baker, D.
dc.contributor.author Claudepierre, S.
dc.date.accessioned 2019-09-11T21:40:30Z
dc.date.available 2021-12-17T22:45:27Z
dc.date.issued 2019-03-12
dc.identifier.citation Kilpua , E K J , Turner , D L , Jaynes , A , Hietala , H , Koskinen , H E J , Osmane , A , Palmroth , M , Pulkkinen , T I , Vainio , R , Baker , D & Claudepierre , S 2019 , ' Outer Van Allen Radiation Belt Response to Interacting Interplanetary Coronal Mass Ejections ' , Journal of geophysical research. Space physics , vol. 124 , no. 3 , pp. 1927-1947 . https://doi.org/10.1029/2018JA026238
dc.identifier.other PURE: 123309664
dc.identifier.other PURE UUID: f34a9fa8-992c-4a83-ab85-3b9cacc89c5a
dc.identifier.other RIS: urn:5023798F558E154F583965C54B4F84CF
dc.identifier.other WOS: 000466087900031
dc.identifier.other ORCID: /0000-0003-3839-6461/work/58509287
dc.identifier.other ORCID: /0000-0003-4857-1227/work/58511971
dc.identifier.other ORCID: /0000-0002-4489-8073/work/58511977
dc.identifier.uri http://hdl.handle.net/10138/305390
dc.description.abstract We study the response of the outer Van Allen radiation belt during an intense magnetic storm on 15-22 February 2014. Four interplanetary coronal mass ejections (ICMEs) arrived at Earth, of which the three last ones were interacting. Using data from the Van Allen Probes, we report the first detailed investigation of electron fluxes from source (tens of kiloelectron volts) to core (megaelectron volts) energies and possible loss and acceleration mechanisms as a response to substructures (shock, sheath and ejecta, and regions of shock-compressed ejecta) in multiple interacting ICMEs. After an initial enhancement induced by a shock compression of the magnetosphere, core fluxes strongly depleted and stayed low for 4 days. This sustained depletion can be related to a sequence of ICME substructures and their conditions that influenced the Earth's magnetosphere. In particular, the main depletions occurred during a high-dynamic pressure sheath and shock-compressed southward ejecta fields. These structures compressed/eroded the magnetopause close to geostationary orbit and induced intense and diverse wave activity in the inner magnetosphere (ULF Pc5, electromagnetic ion cyclotron, and hiss) facilitating both effective magnetopause shadowing and precipitation losses. Seed and source electrons in turn experienced stronger variations throughout the studied interval. The core fluxes recovered during the last ICME that made a glancing blow to Earth. This period was characterized by a concurrent lack of losses and sustained acceleration by chorus and Pc5 waves. Our study highlights that the seemingly complex behavior of the outer belt during interacting ICMEs can be understood by the knowledge of electron dynamics during different substructures. en
dc.format.extent 21
dc.language.iso eng
dc.relation.ispartof Journal of geophysical research. Space physics
dc.rights unspecified
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject DYNAMICS
dc.subject LOSSES
dc.subject SOLAR-WIND
dc.subject WAVES
dc.subject interplanetary coronal mass ejections
dc.subject magnetospheric storm
dc.subject magnetospheric waves
dc.subject outer belt
dc.subject radiation belts
dc.subject solar wind
dc.subject 115 Astronomy, Space science
dc.title Outer Van Allen Radiation Belt Response to Interacting Interplanetary Coronal Mass Ejections en
dc.type Article
dc.contributor.organization Space Physics Research Group
dc.contributor.organization Particle Physics and Astrophysics
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1029/2018JA026238
dc.relation.issn 2169-9380
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

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