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dc.contributor.authorHansen, T.L.
dc.contributor.authorLühr, H.
dc.contributor.authorRother, M.
dc.contributor.authorIyemori, T.
dc.contributor.authorLepping, R.P.
dc.date.accessioned2007-01-24T11:15:38Z
dc.date.available2007-01-24T11:15:38Z
dc.date.issued1998
dc.description.abstractFor the six months from 1 October 1993 to 1 April 1994 the recordings of the IMAGE magnetometer network have been surveyed in a search for large- amplitude travelling convection vortices (TCVs). The restriction to large amplitudes (>100 nT) was chosen to ensure a proper detection of evens also during times of high activity. Readings of all stations of the northern half of the IMAGE network were employed to check the consistency of the ground signature with the notation of a dual-vortex structure moving in an azimuthal direc- tion. Applying these stringent selection criteria we detected a total of 19 clear TCV events. The statistical properties of our selection resemble the expected char- acteristics of large-amplitude TCVs. New and unexpect- ed results emerged from the superposed epoch analysis. TCVs tend to form during quiet intervals embedded in moderately active periods. The occurrence of events is not randomly distributed but rather shows a clustering around a few days. These clusters recur once or twice every 27 days. Within a storm cycle they show up five to seven days after the commencement. With regard to solar wind conditions, we see the events occurring in the middle of the IMF sector structure. Large-amplitude TCVs seem to require certain conditions to make solar wind transients `geoeffective', which have the tendency to recur with the solar rotation period.en
dc.format.extent347374 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.issn1432-0576 (elektronisk)
dc.identifier.urihttps://hdl.handle.net/10037/566
dc.identifier.urnURN:NBN:no-uit_munin_393
dc.language.isoengen
dc.publisherEurepean Geophysical Societyen
dc.relation.ispartofseriesAnnales Geophysicae 16(1998), pp 743-753en
dc.rights.accessRightsopenAccess
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437en
dc.subjectauroral ionosphereen
dc.subjectionosphereen
dc.subjectionosphere-magnetosphere interactionsen
dc.subjectmagnetospheric physicsen
dc.titleSuperposed epoch analysis applied to large-amplitude travelling convection vortices.en
dc.typeJournal articleen
dc.typeTidsskriftartikkelno


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