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

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Lakka, Antti
dc.contributor.author Pulkkinen, Tuija I.
dc.contributor.author Dimmock, Andrew P.
dc.contributor.author Kilpua, Emilia
dc.contributor.author Ala-Lahti, Matti
dc.contributor.author Honkonen, Ilja
dc.contributor.author Palmroth, Minna
dc.contributor.author Raukunen, Osku
dc.date.accessioned 2019-08-15T08:19:45Z
dc.date.available 2019-08-15T08:19:45Z
dc.date.issued 2019-07-11
dc.identifier.citation Lakka , 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-37-561-2019 en
dc.identifier.issn 0992-7689
dc.identifier.issn 1432-0576
dc.identifier.other PURE UUID: 04845a26-cc03-478d-b340-80c9eb12b054
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/04845a26-cc03-478d-b340-80c9eb12b054
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/35786436/ELEC_Lakka_Gumics4_AnnGeo.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/39606
dc.description.abstract We 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.format.extent 19
dc.format.extent 561-579
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Copernicus Gesellschaft mbH
dc.relation.ispartofseries Annales Geophysicae en
dc.relation.ispartofseries Volume 37, issue 4 en
dc.rights openAccess en
dc.title GUMICS-4 analysis of interplanetary coronal mass ejection impact on Earth during low and typical Mach number solar winds en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Tuija Pulkkinen Group
dc.contributor.department Department of Electronics and Nanoengineering
dc.contributor.department Swedish Institute of Space Physics
dc.contributor.department University of Helsinki
dc.contributor.department Finnish Meteorological Institute
dc.contributor.department University of Turku
dc.subject.keyword HIGH-LATITUDE
dc.subject.keyword GEOMAGNETIC-ACTIVITY
dc.subject.keyword PLASMA TRANSPORT
dc.subject.keyword MHD SIMULATION
dc.subject.keyword MAGNETOSPHERE
dc.subject.keyword MODEL
dc.subject.keyword SHOCK
dc.subject.keyword IONOSPHERE
dc.subject.keyword STORMS
dc.identifier.urn URN:NBN:fi:aalto-201908154651
dc.identifier.doi 10.5194/angeo-37-561-2019
dc.type.version publishedVersion

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