GUMICS-4 analysis of interplanetary coronal mass ejection impact on Earth during low and typical Mach number solar winds

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorLakka, Anttien_US
dc.contributor.authorPulkkinen, Tuija I.en_US
dc.contributor.authorDimmock, Andrew P.en_US
dc.contributor.authorKilpua, Emiliaen_US
dc.contributor.authorAla-Lahti, Mattien_US
dc.contributor.authorHonkonen, Iljaen_US
dc.contributor.authorPalmroth, Minnaen_US
dc.contributor.authorRaukunen, Oskuen_US
dc.contributor.departmentDepartment of Electronics and Nanoengineeringen
dc.contributor.groupauthorTuija Pulkkinen Groupen
dc.contributor.organizationUniversity of Helsinkien_US
dc.contributor.organizationFinnish Meteorological Instituteen_US
dc.contributor.organizationUniversity of Turkuen_US
dc.contributor.organizationSwedish Institute of Space Physicsen_US
dc.date.accessioned2019-08-15T08:19:45Z
dc.date.available2019-08-15T08:19:45Z
dc.date.issued2019-07-11en_US
dc.description.abstractWe study the response of the Earth's magnetosphere to fluctuating solar wind conditions during interplanetary coronal mass ejections (ICMEs) using the Grand Unified Magnetosphere-Ionosphere Coupling Simulation (GUMICS-4). The two ICME events occurred on 15-16 July 2012 and 29-30 April 2014. During the strong 2012 event, the solar wind upstream values reached up to 35 particles cm(-3), speeds of up to 694 km s(-1), and an interplanetary magnetic field of up to 22 nT, giving a Mach number of 2.3. The 2014 event was a moderate one, with the corresponding upstream values of 30 particles cm(-3), 320 km s(-1) and 10 nT, indicating a Mach number of 5.8. We examine how the Earth's space environment dynamics evolves during both ICME events from both global and local perspectives, using well-established empirical models and in situ measurements as references. We show that on the large scale, and during moderate driving, the GUMICS-4 results are in good agreement with the reference values. However, the local values, especially during high driving, show more variation: such extreme conditions do not reproduce local measurements made deep inside the magnetosphere. The same appeared to be true when the event was run with another global simulation. The cross-polar cap potential (CPCP) saturation is shown to depend on the Alfven-Mach number of the upstream solar wind. However, care must be taken in interpreting these results, as the CPCP is also sensitive to the simulation resolution.en
dc.description.versionPeer revieweden
dc.format.extent19
dc.format.extent561-579
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationLakka, A, Pulkkinen, T I, Dimmock, A P, Kilpua, E, Ala-Lahti, M, Honkonen, I, Palmroth, M & Raukunen, O 2019, ' GUMICS-4 analysis of interplanetary coronal mass ejection impact on Earth during low and typical Mach number solar winds ', Annales Geophysicae, vol. 37, no. 4, pp. 561-579 . https://doi.org/10.5194/angeo-37-561-2019en
dc.identifier.doi10.5194/angeo-37-561-2019en_US
dc.identifier.issn0992-7689
dc.identifier.issn1432-0576
dc.identifier.otherPURE UUID: 04845a26-cc03-478d-b340-80c9eb12b054en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/04845a26-cc03-478d-b340-80c9eb12b054en_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/35786436/ELEC_Lakka_Gumics4_AnnGeo.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/39606
dc.identifier.urnURN:NBN:fi:aalto-201908154651
dc.language.isoenen
dc.publisherCopernicus Gesellschaft mbH
dc.relation.ispartofseriesAnnales Geophysicaeen
dc.relation.ispartofseriesVolume 37, issue 4en
dc.rightsopenAccessen
dc.subject.keywordCAP POTENTIAL SATURATIONen_US
dc.subject.keywordHIGH-LATITUDEen_US
dc.subject.keywordGEOMAGNETIC-ACTIVITYen_US
dc.subject.keywordPLASMA TRANSPORTen_US
dc.subject.keywordMHD SIMULATIONen_US
dc.subject.keywordMAGNETOSPHEREen_US
dc.subject.keywordMODELen_US
dc.subject.keywordSHOCKen_US
dc.subject.keywordIONOSPHEREen_US
dc.subject.keywordSTORMSen_US
dc.titleGUMICS-4 analysis of interplanetary coronal mass ejection impact on Earth during low and typical Mach number solar windsen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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