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Storm-time ring current: model-dependent results

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Ganushkina, N. Yu.
dc.contributor.author Liemohn, M. W.
dc.contributor.author Pulkkinen, Tuija I.
dc.date.accessioned 2015-03-30T09:01:08Z
dc.date.available 2015-03-30T09:01:08Z
dc.date.issued 2012
dc.identifier.citation Ganushkina, N. Yu. & Liemohn, M. W. & Pulkkinen, Tuija I. 2012. Storm-time ring current: model-dependent results. Annales Geophysicae, Vol. 30, nro 1. pp. 177-202. 1432-0576 (electronic). DOI: 10.5194/angeo-30-177-2012. en
dc.identifier.issn 1432-0576 (electronic)
dc.identifier.issn 0992-7689 (printed)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/15443
dc.description.abstract The main point of the paper is to investigate how much the modeled ring current depends on the representations of magnetic and electric fields and boundary conditions used in simulations. Two storm events, one moderate (SymH minimum of −120 nT) on 6–7 November 1997 and one intense (SymH minimum of −230 nT) on 21–22 October 1999, are modeled. A rather simple ring current model is employed, namely, the Inner Magnetosphere Particle Transport and Acceleration model (IMPTAM), in order to make the results most evident. Four different magnetic field and two electric field representations and four boundary conditions are used. We find that different combinations of the magnetic and electric field configurations and boundary conditions result in very different modeled ring current, and, therefore, the physical conclusions based on simulation results can differ significantly. A time-dependent boundary outside of 6.6 RE gives a possibility to take into account the particles in the transition region (between dipole and stretched field lines) forming partial ring current and near-Earth tail current in that region. Calculating the model SymH* by Biot-Savart's law instead of the widely used Dessler-Parker-Sckopke (DPS) relation gives larger and more realistic values, since the currents are calculated in the regions with nondipolar magnetic field. Therefore, the boundary location and the method of SymH* calculation are of key importance for ring current data-model comparisons to be correctly interpreted. en
dc.format.extent 177-202
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher European Geosciences Union en
dc.relation.ispartofseries Annales Geophysicae, Vol. 30, nro 1 en
dc.rights © Authors 2012. This work is distributed under the Creative Commons Attribution 3.0 License en
dc.subject.other Space technology en
dc.title Storm-time ring current: model-dependent results en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.rights.holder Authors
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.contributor.school School of Electrical Engineering en
dc.subject.keyword magnetospheric physics en
dc.subject.keyword current systems en
dc.subject.keyword energetic particles, trapped en
dc.subject.keyword storms and substorms en
dc.identifier.urn URN:NBN:fi:aalto-201503262102
dc.type.dcmitype text en
dc.identifier.doi 10.5194/angeo-30-177-2012
dc.type.version Final published version en


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