FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2116865395> ?p ?o ?g. }

• W2116865395 endingPage "1132" @default.
• W2116865395 startingPage "1115" @default.
• W2116865395 abstract "Abstract. Several explanations have been proposed for Naturally Enhanced ion-acoustic Echoes observed at mid- and high-latitude Incoherent Scatter observatories. A decisive measure for distinguishing between these explanations is whether or not simultaneously observed up- and down-shifted enhancement occur simultaneously, or if they are the result of temporal and/or spatial averaging. The EISCAT Svalbard Radar has two antennas in the same radar system, which can be used as an interferometer when pointed parallel. In observations from 17 January 2002, between 06:46:10 and 06:46:30 UT, we used this possibility, in combination with direct sampling of the received signals, to yield measurements of naturally enhanced ion-acoustic echoes with sufficiently high resolution to resolve such averaging, if any. For the first time, radar interferometry has been employed to estimate the sizes of coherent structures. The observations were coordinated with an image intensified video camera with a narrow field of view. Together, this forms the initial study on the causal relationships between enhanced echoes and fine structure in the auroral activity on sub-kilometer, sub-second scales. The results confirm that the enhanced echoes originate from very localised regions (~300m perpendicular to the magnetic field at 500km altitude) with varying range distribution, and with high time variability (≈200ms). The corresponding increase in scattering cross section, up to 50dB above incoherent scattering, eliminates theoretical explanations based on marginal stability. The simultaneously observed up- and down-shifted enhanced shoulders, when caused by sufficiently narrow structures to be detected by the interferometer technique, originate predominantly from the same volume. These results have significant impact on theories attempting to explain the enhancements, in particular it is found that the ion-electron two-stream mechanism favoured by many authors is an unlikely candidate to explain the observations. The video data has helped establish a clear correlation between the enhanced echoes and auroral activity, on sub-second time scales, showing a threshold connection between the auroral intensity and the triggering of the radar enhancements. It appears that the up- and down-shifted enhanced echoes correlate with fine auroral structures in different ways. Key words. Ionosphere (auroral ionosphere; plasma waves and instabilities) – Radio science (interferometry)" @default.
• W2116865395 created "2016-06-24" @default.
• W2116865395 creator A5007258256 @default.
• W2116865395 creator A5021498413 @default.
• W2116865395 creator A5027312162 @default.
• W2116865395 creator A5052387599 @default.
• W2116865395 creator A5071296257 @default.
• W2116865395 creator A5090189794 @default.
• W2116865395 date "2004-04-02" @default.
• W2116865395 modified "2023-10-01" @default.
• W2116865395 title "Interferometric radar observations of filamented structures due to plasma instabilities and their relation to dynamic auroral rays" @default.
• W2116865395 cites W1657938064 @default.
• W2116865395 cites W1663357484 @default.
• W2116865395 cites W1677722576 @default.
• W2116865395 cites W1965599137 @default.
• W2116865395 cites W1965646598 @default.
• W2116865395 cites W1979717848 @default.
• W2116865395 cites W1984327647 @default.
• W2116865395 cites W2005560335 @default.
• W2116865395 cites W2011451941 @default.
• W2116865395 cites W2015364064 @default.
• W2116865395 cites W2015723966 @default.
• W2116865395 cites W2021574466 @default.
• W2116865395 cites W2039748356 @default.
• W2116865395 cites W2040319897 @default.
• W2116865395 cites W2051452235 @default.
• W2116865395 cites W2056086359 @default.
• W2116865395 cites W2058997031 @default.
• W2116865395 cites W2073950454 @default.
• W2116865395 cites W2079488053 @default.
• W2116865395 cites W2080432362 @default.
• W2116865395 cites W2081644559 @default.
• W2116865395 cites W2082003141 @default.
• W2116865395 cites W2085998255 @default.
• W2116865395 cites W2092116962 @default.
• W2116865395 cites W2109895821 @default.
• W2116865395 cites W2118465197 @default.
• W2116865395 cites W2263224228 @default.
• W2116865395 cites W3140793809 @default.
• W2116865395 cites W3145205731 @default.
• W2116865395 cites W99506731 @default.
• W2116865395 doi "https://doi.org/10.5194/angeo-22-1115-2004" @default.
• W2116865395 hasPublicationYear "2004" @default.
• W2116865395 type Work @default.
• W2116865395 sameAs 2116865395 @default.
• W2116865395 citedByCount "38" @default.
• W2116865395 countsByYear W21168653952012 @default.
• W2116865395 countsByYear W21168653952013 @default.
• W2116865395 countsByYear W21168653952014 @default.
• W2116865395 countsByYear W21168653952015 @default.
• W2116865395 countsByYear W21168653952017 @default.
• W2116865395 countsByYear W21168653952021 @default.
• W2116865395 countsByYear W21168653952022 @default.
• W2116865395 crossrefType "journal-article" @default.
• W2116865395 hasAuthorship W2116865395A5007258256 @default.
• W2116865395 hasAuthorship W2116865395A5021498413 @default.
• W2116865395 hasAuthorship W2116865395A5027312162 @default.
• W2116865395 hasAuthorship W2116865395A5052387599 @default.
• W2116865395 hasAuthorship W2116865395A5071296257 @default.
• W2116865395 hasAuthorship W2116865395A5090189794 @default.
• W2116865395 hasBestOaLocation W21168653951 @default.
• W2116865395 hasConcept C120665830 @default.
• W2116865395 hasConcept C121332964 @default.
• W2116865395 hasConcept C127313418 @default.
• W2116865395 hasConcept C166689943 @default.
• W2116865395 hasConcept C191486275 @default.
• W2116865395 hasConcept C30475298 @default.
• W2116865395 hasConcept C35777598 @default.
• W2116865395 hasConcept C41008148 @default.
• W2116865395 hasConcept C554190296 @default.
• W2116865395 hasConcept C62649853 @default.
• W2116865395 hasConcept C76155785 @default.
• W2116865395 hasConcept C8058405 @default.
• W2116865395 hasConceptScore W2116865395C120665830 @default.
• W2116865395 hasConceptScore W2116865395C121332964 @default.
• W2116865395 hasConceptScore W2116865395C127313418 @default.
• W2116865395 hasConceptScore W2116865395C166689943 @default.
• W2116865395 hasConceptScore W2116865395C191486275 @default.
• W2116865395 hasConceptScore W2116865395C30475298 @default.
• W2116865395 hasConceptScore W2116865395C35777598 @default.
• W2116865395 hasConceptScore W2116865395C41008148 @default.
• W2116865395 hasConceptScore W2116865395C554190296 @default.
• W2116865395 hasConceptScore W2116865395C62649853 @default.
• W2116865395 hasConceptScore W2116865395C76155785 @default.
• W2116865395 hasConceptScore W2116865395C8058405 @default.
• W2116865395 hasIssue "4" @default.
• W2116865395 hasLocation W21168653951 @default.
• W2116865395 hasLocation W21168653952 @default.
• W2116865395 hasLocation W21168653953 @default.
• W2116865395 hasLocation W21168653954 @default.
• W2116865395 hasLocation W21168653955 @default.
• W2116865395 hasOpenAccess W2116865395 @default.
• W2116865395 hasPrimaryLocation W21168653951 @default.
• W2116865395 hasRelatedWork W1581984558 @default.
• W2116865395 hasRelatedWork W1986072146 @default.
• W2116865395 hasRelatedWork W1993061538 @default.
• W2116865395 hasRelatedWork W2008471360 @default.
• W2116865395 hasRelatedWork W2033581891 @default.

• next