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dc.contributor.authorHumberset, Beate Krøvel
dc.contributor.authorGjerløv, Jesper
dc.contributor.authorSamara, Marilla
dc.contributor.authorMichell, Robert
dc.PublishedHumberset BK, Gjerløv J, Samara M, Michell R. Scale size-dependent characteristics of the nightside aurora. Journal of Geophysical Research - Space Physics. 2017;122(2):2455-2466eng
dc.description.abstractWe have determined the spatiotemporal characteristics of the magnetosphere-ionosphere (M-I) coupling using auroral imaging. Observations at fixed positions for an extended period of time are provided by a ground-based all-sky imager measuring the 557.7 nm auroral emissions. We report on a single event of nightside aurora (∼22 magnetic local time) preceding a substorm onset. To determine the spatiotemporal characteristics, we perform an innovative analysis of an all-sky imager movie (19 min duration, images at 3.31 Hz) that combines a two-dimensional spatial fast Fourier transform with a temporal correlation. We find a scale size-dependent variability where the largest scale sizes are stable on timescales of minutes while the small scale sizes are more variable. When comparing two smaller time intervals of different types of auroral displays, we find a variation in their characteristics. The characteristics averaged over the event are in remarkable agreement with the spatiotemporal characteristics of the nightside field-aligned currents during moderately disturbed times. Thus, two different electrodynamical parameters of the M-I coupling show similar behavior. This gives independent support to the claim of a system behavior that uses repeatable solutions to transfer energy and momentum from the magnetosphere to the ionosphere.en_US
dc.relation.ispartof<a href="" target="_blank">Scale size-dependent characteristics of the magnetosphere-ionosphere system using auroral imaging</a>en_US
dc.rightsAttribution CC BY-NC-NDeng
dc.titleScale size-dependent characteristics of the nightside auroraen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2017 The Author(s)en_US
dc.source.journalJournal of Geophysical Research - Space Physics
dc.relation.projectNorges forskningsråd: 223252

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