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dc.contributor.authorHall, Chris
dc.contributor.authorAso, T.
dc.contributor.authorTsutsumi, M.
dc.contributor.authorNozawa, S.
dc.contributor.authorManson, A.H.
dc.contributor.authorMeek, C.E.
dc.date.accessioned2007-01-29T13:12:08Z
dc.date.available2007-01-29T13:12:08Z
dc.date.issued2005-03-30
dc.description.abstractFading times of radar echoes from underdense meteor trails in the upper mesosphere/lower thermosphere are commonly used to determine ambipolar diffusivities and hence ambient temperature. Diffusivities are generally expected to increase exponentially with height through the region from which the meteor trail echoes are obtained, viz., typically 70-110km altitude for a ~30-MHz radar. In practice, however, this is more the exception: unexpectedly large diffusivities are obtained in the lower part of the regime, and unexpectedly low values are obtained in the upper part; only in the few kilometres on either side of the maximum in echo occurrence (viz., 90km for a 30-MHz radar) does the diffusivity profile behave as expected. Hall (2002) hypothesised that neutral turbulence might be enhancing expansion of the meteor trail in the lower part of the regime. In this communication, due to results only available since the publication of Hall's suggestion, we are able to refute the hypothesis.en
dc.format.extent2336711 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.issn1432-0576 (elektronisk)
dc.identifier.urihttps://hdl.handle.net/10037/578
dc.identifier.urnURN:NBN:no-uit_munin_402
dc.language.isoengen
dc.publisherEuropean Geosciences Unionen
dc.relation.ispartofseriesAnnales Geophysicae 23(2005), pp 1071-1073en
dc.rights.accessRightsopenAccess
dc.subjectVDP::Matematikk og naturvitenskap: 400::Fysikk: 430en
dc.subjectVDP::Matematikk og naturvitenskap: 400::Geofag: 450::Meteorologi: 453en
dc.subjectatmospheric composition and structureen
dc.subjectinstrumentation and techniquesen
dc.subjectmeterorology and atmospheric dynamicsen
dc.subjectturbulenceen
dc.subjectmiddle atmosphere dynamicsen
dc.titleTesting the hypothesis of the influence of neutral turbulence on the deduction of ambipolar diffusivities from meteor trail expansionen
dc.typeJournal articleen
dc.typePeer reviewed
dc.typeTidsskriftartikkelno


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