Show simple item record

dc.contributor.authorPartamies, Noora
dc.contributor.authorBolmgren, Karl
dc.contributor.authorHeino, Erkka
dc.contributor.authorIvchenko, Nickolay
dc.contributor.authorBorovsky, Joseph E.
dc.contributor.authorSundberg, Hanna
dc.date.accessioned2020-02-17T09:23:49Z
dc.date.available2020-02-17T09:23:49Z
dc.date.issued2019-05-30
dc.description.abstractWe report both decreasing and increasing trends in the patch sizes during pulsating aurora events. About 150 pulsating auroral events over the Fennoscandian Lapland have been successfully analyzed for their average patch size, total patch area, and number of patches as a function of event time, typically 1–2 hr. An automatic routine has been developed to detect patches in the all‐sky camera images. In addition to events with decreasing and increasing average patch size evolution over the course of the pulsating aurora, events with no size trends and events with intermittently increasing and decreasing patch size trends were also found. In this study, we have analyzed a subset of events for which the average and total patch size systematically increase or decrease. The events with increasing patch size trend do not experience a decrease in the peak emission height, which was previously associated with the behavior of pulsating aurora precipitation. Furthermore, the events with increasing patch sizes have shorter lifetimes and twice as many substorm‐injected energetic electrons at geosynchronous orbit as the events with decreasing patch sizes. Half of the events with increasing patch sizes occur during substorm expansion phases, while a majority (64%) of the ones with decreasing patch sizes take place during the recovery phase. These findings suggest that the visual appearance of pulsating aurora may be used as an indication of the pulsating aurora energy deposition to the atmosphere.en_US
dc.identifier.citationPartamies N, Bolmgren, Heino E, Ivchenko N, Borovsky, Sundberg. Patch Size Evolution During Pulsating Aurora. Journal of Geophysical Research (JGR): Space Physics. 2019;124(6):4725-4738en_US
dc.identifier.cristinIDFRIDAID 1722869
dc.identifier.doi10.1029/2018JA026423
dc.identifier.issn2169-9380
dc.identifier.issn2169-9402
dc.identifier.urihttps://hdl.handle.net/10037/17405
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalJournal of Geophysical Research (JGR): Space Physics
dc.relation.projectIDNorges forskningsråd: 223252en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223252/Norway/Birkeland Center for Space Science/BCSS/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2019 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400en_US
dc.titlePatch Size Evolution During Pulsating Auroraen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


File(s) in this item

Thumbnail

This item appears in the following collection(s)

Show simple item record