FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W781210130> ?p ?o ?g. }

• W781210130 abstract "An electronic system has been designed to monitor the total electron content (TEC) of the ionosphere. This is accomplished by measuring propagation effects, specifically Faraday rotation and dispersive-Doppler phase shift, on VIIF/UHF transmissions from artificial Earth satellites. Special phase-locked receivers are used to receive the 137,35 MHz radio signal from the geostationary satellite ATS-1 as well as the 150 and 400 MHz transmissions from five low altitude polar orbiting satellites comprising the U.S. Navy Navigation Satellite System (NNSS). Continuous Faraday rotation measurements are performed on the ATS-1 signal using a mechanical rotating Yagi antenna polarimeter while MSS polarization measurements are achieved with a spaced helical antenna polarimeter incorporating a dual phase-locked receiver which detects the phase difference between the outputs of the two oppositely polarized receiving antennas. Dispersive- Doppler phase shift measurements on the phase coherent 150 and 400 MHz NNSS transmissions are also accomplished with a dual phase-locked receiver. ATS-1 measurements are recorded in analogue form on slow speed chart recorders providing polarization and time resolutions better than 5° and 1 minute respectively. Digital techniques are utilized in recording NNSS data with analogue chart recorder outputs providing simultaneous visual representation. Conputer compatible magnetic tape format allows optimum transfer of data from the recording system to off-line computers. While a significant section of this thesis is devoted to the concepts and design of the instrumentation, a prime objective of the research has been to assess the spatial and temporal behaviour of the mid-latitude F-region using the ground based TEC observations which this experiment provides. Various methods have been investigated for converting the raw data into measurements of TEC. TEC observations provided by this experiment as well as ionosonde foF2 (F2 layer critical frequency) data from four Eastern Australian stations have been used to study gross morphological features of the mid-latitude F-region. This data is supplemented with Brisbane hmF2 (F2 layer peak height) variations and thermospheric wind measurements from the Mt. Torrens station near Adelaide. Several striking features were discovered. An apparent accumulation of F-region ionization during Winter sunset was detected over the geographic latitude range 28 – 32°S. This was associated with excessively large horizontal ionization gradients to the North and South of the region. A peculiar feature, probably an extension of the sunset plasma pile-up phenomenon, was also observed during all Winter nocturnal periods. F-region ionospheric irregularities have been studied. Temporal variations with periods 15 - 300 mins and spatial structures having scale sizes 30 - 2000 km were detected. A large number of these irregularities are identified as F-region travelling ionospheric disturbances (TID's). Measurement of their horizontal phase velocity components has allowed an experimental determination of the dispersion relation for F-region TID's. Moderate agreement with theoretical dispersion curves for internal atmospheric gravity waves highlights the correlation between observed TID's and internal neutral atmospheric gravity waves which propagate at F-region heights." @default.
• W781210130 created "2016-06-24" @default.
• W781210130 creator A5091115825 @default.
• W781210130 date "2015-05-20" @default.
• W781210130 modified "2023-09-25" @default.
• W781210130 title "Phase-locked reception of radio transmissions from earth satellites : concepts, design and applications to the study of ionosphere" @default.
• W781210130 doi "https://doi.org/10.14264/uql.2015.524" @default.
• W781210130 hasPublicationYear "2015" @default.
• W781210130 type Work @default.
• W781210130 sameAs 781210130 @default.
• W781210130 citedByCount "0" @default.
• W781210130 crossrefType "dissertation" @default.
• W781210130 hasAuthorship W781210130A5091115825 @default.
• W781210130 hasConcept C115260700 @default.
• W781210130 hasConcept C116403925 @default.
• W781210130 hasConcept C121332964 @default.
• W781210130 hasConcept C127313418 @default.
• W781210130 hasConcept C1276947 @default.
• W781210130 hasConcept C142757262 @default.
• W781210130 hasConcept C16405173 @default.
• W781210130 hasConcept C165391973 @default.
• W781210130 hasConcept C176379880 @default.
• W781210130 hasConcept C19269812 @default.
• W781210130 hasConcept C207230154 @default.
• W781210130 hasConcept C62520636 @default.
• W781210130 hasConcept C62649853 @default.
• W781210130 hasConcept C8058405 @default.
• W781210130 hasConceptScore W781210130C115260700 @default.
• W781210130 hasConceptScore W781210130C116403925 @default.
• W781210130 hasConceptScore W781210130C121332964 @default.
• W781210130 hasConceptScore W781210130C127313418 @default.
• W781210130 hasConceptScore W781210130C1276947 @default.
• W781210130 hasConceptScore W781210130C142757262 @default.
• W781210130 hasConceptScore W781210130C16405173 @default.
• W781210130 hasConceptScore W781210130C165391973 @default.
• W781210130 hasConceptScore W781210130C176379880 @default.
• W781210130 hasConceptScore W781210130C19269812 @default.
• W781210130 hasConceptScore W781210130C207230154 @default.
• W781210130 hasConceptScore W781210130C62520636 @default.
• W781210130 hasConceptScore W781210130C62649853 @default.
• W781210130 hasConceptScore W781210130C8058405 @default.
• W781210130 hasLocation W7812101301 @default.
• W781210130 hasOpenAccess W781210130 @default.
• W781210130 hasPrimaryLocation W7812101301 @default.
• W781210130 hasRelatedWork W110351508 @default.
• W781210130 hasRelatedWork W22153916 @default.
• W781210130 hasRelatedWork W2761860146 @default.
• W781210130 hasRelatedWork W3002094857 @default.
• W781210130 hasRelatedWork W3006088955 @default.
• W781210130 hasRelatedWork W3080623534 @default.
• W781210130 hasRelatedWork W3082412997 @default.
• W781210130 hasRelatedWork W3108300150 @default.
• W781210130 hasRelatedWork W3194653767 @default.
• W781210130 hasRelatedWork W3117702833 @default.
• W781210130 isParatext "false" @default.
• W781210130 isRetracted "false" @default.
• W781210130 magId "781210130" @default.
• W781210130 workType "dissertation" @default.