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dc.contributor.authorSpencer, Edmund
dc.contributor.authorVadepu, Sai K
dc.contributor.authorSrinivas, Pavithra
dc.contributor.authorPatra, Swadesh
dc.contributor.authorHorton, Wendell
dc.date.accessioned2018-07-17T05:04:18Z
dc.date.available2018-07-17T05:04:18Z
dc.date.issued2018
dc.identifier.citationEarth, Planets and Space. 2018 Jul 11;70(1):118
dc.identifier.urihttp://hdl.handle.net/10852/62286
dc.description.abstractThe global dynamics of substorms are controlled by several key magnetospheric parameters. In this work we obtain quantitative measures of these parameters from a low-order nonlinear model of the nightside magnetosphere called WINDMI. The model uses solar wind and IMF measurements from the ACE spacecraft as input into a system of 8 nonlinear ordinary differential equations. The state variables of the differential equations represent the energy stored in the geomagnetic tail, central plasma sheet, ring current and field-aligned currents. The output from the model is the geomagnetic westward auroral electrojet (AL) index and the Dst index. Intermediate variables of the model are the plasma sheet pressure, geotail current, cross-tail electric field, parallel ion velocity and the pressure gradient current. The values of these variables are controlled by physical parameters of the model, consisting of spatially averaged quantities that are analogous to electric circuit elements. We tune the model to re-produce substorm events, comparing model capability against observations of auroral brightening and the auroral electrojet indices AL from WDC Kyoto and SML from SuperMAG. The model is capable of capturing events within a 10–12-min interval of occurrence, with level of activity comparable to the measured indices.
dc.language.isoeng
dc.rightsThe Author(s); licensee Springer International Publishing Ltd.
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleThe dynamics of geomagnetic substorms with the WINDMI model
dc.typeJournal article
dc.date.updated2018-07-17T05:04:19Z
dc.creator.authorSpencer, Edmund
dc.creator.authorVadepu, Sai K
dc.creator.authorSrinivas, Pavithra
dc.creator.authorPatra, Swadesh
dc.creator.authorHorton, Wendell
dc.identifier.doihttps://doi.org/10.1186/s40623-018-0882-9
dc.identifier.urnURN:NBN:no-64872
dc.type.documentTidsskriftartikkel
dc.type.peerreviewedPeer reviewed
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/62286/1/40623_2018_Article_882.pdf
dc.type.versionPublishedVersion
cristin.articleid118


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