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dc.contributor.authorBarr, R.
dc.contributor.authorRietveld, Michael T.
dc.contributor.authorStubbe, P.
dc.date.accessioned2007-02-12T10:04:05Z
dc.date.available2007-02-12T10:04:05Z
dc.date.issued1999
dc.description.abstractThis paper describes the results of a preliminary study to determine the effective heating and cooling time constants of ionospheric currents in a simulated modulated HF heating, `beam painting' configuration. It has been found that even and odd harmonics of the fundamental ELF wave used to amplitude modulate the HF heater are sourced from different regions of the ionosphere which support significantly different heating and cooling time constants. The fundamental frequency and its odd harmonics are sourced in a region of the ionosphere where the heating and cooling time constants are about equal. The even harmonics on the other hand are sourced from regions of the ionosphere characterised by ratios of cooling to heating time constant greater than ten. It is thought that the even harmonics are sourced in the lower ionosphere (around 65 km) where the currents are much smaller than at the higher altitudes around 78 km where the currents at the fundamental frequency and odd harmonics maximise.en
dc.format.extent331777 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.issn1432-0576 (elektronisk)
dc.identifier.urihttp://hdl.handle.net/10037/610
dc.identifier.urnURN:NBN:no-uit_munin_429
dc.language.isoengen
dc.publisherEuropean Geophysical Societyen
dc.relation.ispartofseriesAnnales Geophysicae 17(1999), pp 759-769en
dc.rights.accessRightsopenAccess
dc.subjectVDP::Matematikk og naturvitenskap: 400::Fysikk: 430::Elektromagnetisme, akustikk, optikk: 434en
dc.subjectVDP::Matematikk og naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437en
dc.subjectelectromagneticsen
dc.subjectantennaeen
dc.subjectionosphereen
dc.subjectactive experimentsen
dc.subjectradio scienceen
dc.subjectnon linear phenomenaen
dc.titleELF wave generation in the ionosphere using pulse modulated HF heating. Initial tests of a technique for increasing ELF wave generation efficiency.en
dc.typeJournal articleen
dc.typePeer reviewed
dc.typeTidsskriftartikkelno


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