{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1361699995998154752.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.5194/angeo-25-675-2007"}},{"identifier":{"@type":"URI","@value":"https://angeo.copernicus.org/articles/25/675/2007/angeo-25-675-2007.pdf"}}],"dc:title":[{"@value":"Factors determining spectral width of HF echoes from high latitudes"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>Abstract. Spectral width is one of the standard data types produced by the Super Dual Auroral Radar Network (SuperDARN). A pronounced latitudinal gradient in spectral width has been reported in the literature and is used as an empirical proxy for the ionospheric footprint of the open-closed field-line boundary. In this work we investigated the daytime radar echo properties near the spectral width boundary using a multi-frequency sounding regime. We have found that the relatively large spectral width values ≥150 m/s observed poleward of the boundary are produced by ionospheric irregularities with lifetime τl≃10–25 ms, which is essentially independent of the scale size. These irregularities are statistically co-located with low-energy (~100 eV) electron precipitation, which may play a major role in producing F-region turbulence above 75 MLAT via restructuring the ionospheric plasma on time scales ~τl.\n                    </jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380005521909436290","@type":"Researcher","foaf:name":[{"@value":"P. V. Ponomarenko"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699995998154752","@type":"Researcher","foaf:name":[{"@value":"C. L. Waters"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699995998154754","@type":"Researcher","foaf:name":[{"@value":"F. W. Menk"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"14320576"}],"prism:publicationName":[{"@value":"Annales Geophysicae"}],"dc:publisher":[{"@value":"Copernicus GmbH"}],"prism:publicationDate":"2007-03-29","prism:volume":"25","prism:number":"3","prism:startingPage":"675","prism:endingPage":"687"},"reviewed":"false","dc:rights":["https://creativecommons.org/licenses/by/3.0/"],"url":[{"@id":"https://angeo.copernicus.org/articles/25/675/2007/angeo-25-675-2007.pdf"}],"createdAt":"2010-06-15","modifiedAt":"2021-01-28","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004240189481472","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Local time extent of magnetopause reconnection using space–ground coordination"}]},{"@id":"https://cir.nii.ac.jp/crid/2051433317026704640","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Comparison of SuperDARN peak electron density estimates based on elevation angle measurements to ionosonde and incoherent scatter radar measurements"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.5194/angeo-25-675-2007"},{"@type":"CROSSREF","@value":"10.5194/angeo-37-215-2019_references_DOI_9TPGYo4Ote4xs84xA8S9w887zMm"},{"@type":"CROSSREF","@value":"10.1186/s40623-020-01170-w_references_DOI_9TPGYo4Ote4xs84xA8S9w887zMm"}]}