Show simple item record

dc.contributor.authorHumberset, Beate Krøvel
dc.contributor.authorGjerløv, Jesper
dc.contributor.authorMann, Ian R.
dc.contributor.authorMichell, Robert
dc.contributor.authorSamara, Marilla
dc.PublishedHumberset BK, Gjerløv J, Mann IR, Michell R, Samara M. On the Persistent Shape and Coherence of Pulsating Auroral Patches. Journal of Geophysical Research - Space Physics. 2018;123(5):4272-4289eng
dc.description.abstractThe pulsating aurora covers a broad range of fluctuating shapes that are poorly characterized. The purpose of this paper is therefore to provide objective and quantitative measures of the extent to which pulsating auroral patches maintain their shape, drift and fluctuate in a coherent fashion. We present results from a careful analysis of pulsating auroral patches using all-sky cameras. We have identified four well-defined individual patches that we follow in the patch frame of reference. In this way we avoid the space-time ambiguity which complicates rocket and satellite measurements. We find that the shape of the patches is remarkably persistent with 85–100% of the patch being repeated for 4.5–8.5 min. Each of the three largest patches has a temporal correlation with a negative dependence on distance, and thus does not fluctuate in a coherent fashion. A time-delayed response within the patches indicates that the so-called streaming mode might explain the incoherency. The patches appear to drift differently from the SuperDARN-determined E × B convection velocity. However, in a nonrotating reference frame the patches drift with 230–287 m/s in a north eastward direction, which is what typically could be expected for the convection return flowen_US
dc.publisherAmerican Geophysical Unionen_US
dc.rightsAttribution CC BY-NC-NDeng
dc.titleOn the Persistent Shape and Coherence of Pulsating Auroral Patchesen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2018 The Author(s)en_US
dc.source.journalJournal of Geophysical Research - Space Physics
dc.relation.projectNorges forskningsråd: 223252

Files in this item


This item appears in the following Collection(s)

Show simple item record

Attribution CC BY-NC-ND
Except where otherwise noted, this item's license is described as Attribution CC BY-NC-ND