{"@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/1361137046412795648.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1002/2014ja020658"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2014JA020658"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2014JA020658"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/full-xml/10.1002/2014JA020658"}}],"dc:title":[{"@value":"Optical and ionospheric phenomena at EISCAT under continuous\n                    <i>X</i>\n                    ‐mode HF pumping"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title>\n                  <jats:p>\n                    We present experimental results from multiinstrument observations in the high‐latitude ionospheric\n                    <jats:italic>F</jats:italic>\n                    <jats:sub>2</jats:sub>\n                    layer at the EISCAT (European Incoherent Scatter Scientific Association) heating facility. The results come from a set of experiments, when an\n                    <jats:italic>X</jats:italic>\n                    ‐polarized HF pump wave at high heater frequencies (\n                    <jats:italic>f</jats:italic>\n                    <jats:sub>H</jats:sub>\n                    > 6.0 MHz) was injected into the\n                    <jats:italic>F</jats:italic>\n                    region of the ionosphere toward the magnetic zenith. Experiments were carried out under quiet magnetic conditions with an effective radiated power of 458–548 MW. HF pumping was produced at different heater frequencies, away from electron gyroharmonic frequencies, and different durations of heater pulses. We show the first experimental evidence of the excitation of artificial optical emissions at red (630 nm) and green (557.7 nm) lines in the high‐latitude ionospheric\n                    <jats:italic>F</jats:italic>\n                    <jats:sub>2</jats:sub>\n                    layer induced by an\n                    <jats:italic>X</jats:italic>\n                    ‐polarized HF pump wave. Intensities at red and green lines varied in the range 110–950 R and 50–350 R, respectively, with a ratio of green to red line of 0.35–0.5. The results of optical observations are compared with behaviors of the HF‐enhanced ion and plasma lines from EISCAT UHF incoherent scatter radar data and small‐scale field‐aligned artificial irregularities from Cooperative UK Twin Located Auroral Sounding System observations. It was found that the\n                    <jats:italic>X</jats:italic>\n                    ‐mode radio‐induced optical emissions coexisted with HF‐enhanced ion and plasma lines and strong artificial field‐aligned irregularities throughout the whole heater pulse. It is indicative that parametric decay or oscillating two‐stream instabilities were not quenched by fully established small‐scale field‐aligned artificial irregularities excited by an\n                    <jats:italic>X</jats:italic>\n                    ‐mode HF pump wave.\n                  </jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380567186806369679","@type":"Researcher","foaf:name":[{"@value":"N. F. Blagoveshchenskaya"}],"jpcoar:affiliationName":[{"@value":"Department of Geophysics Arctic and Antarctic Research Institute  St. Petersburg Russia"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137046412795651","@type":"Researcher","foaf:name":[{"@value":"T. D. Borisova"}],"jpcoar:affiliationName":[{"@value":"Department of Geophysics Arctic and Antarctic Research Institute  St. Petersburg Russia"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137046412795652","@type":"Researcher","foaf:name":[{"@value":"M. Kosch"}],"jpcoar:affiliationName":[{"@value":"Physics Department Lancaster University  Lancaster UK"},{"@value":"South African National Space Agency  Hermanus South Africa"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137046412795650","@type":"Researcher","foaf:name":[{"@value":"T. Sergienko"}],"jpcoar:affiliationName":[{"@value":"Swedish Institute of Space Physics  Kiruna Sweden"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137046412795648","@type":"Researcher","foaf:name":[{"@value":"U. Brändström"}],"jpcoar:affiliationName":[{"@value":"Swedish Institute of Space Physics  Kiruna Sweden"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137046412795653","@type":"Researcher","foaf:name":[{"@value":"T. K. Yeoman"}],"jpcoar:affiliationName":[{"@value":"Department of Physics and Astronomy University of Leicester  Leicester UK"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137046412795649","@type":"Researcher","foaf:name":[{"@value":"I. Häggström"}],"jpcoar:affiliationName":[{"@value":"EISCAT Scientific Association  Kiruna Sweden"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"21699380"},{"@type":"EISSN","@value":"21699402"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Space Physics"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2014-12","prism:volume":"119","prism:number":"12","prism:startingPage":"10,483"},"reviewed":"false","dc:rights":["http://creativecommons.org/licenses/by/4.0/","http://doi.wiley.com/10.1002/tdm_license_1.1"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2014JA020658"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2014JA020658"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/full-xml/10.1002/2014JA020658"}],"createdAt":"2014-11-26","modifiedAt":"2026-02-04","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/2050588892082790272","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Survey of conditions for artificial aurora experiments by the second electron gyro-harmonic at EISCAT Tromso using dynasonde data"}]},{"@id":"https://cir.nii.ac.jp/crid/2051433317008467968","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Survey of conditions for artificial aurora experiments at EISCAT Tromsø using dynasonde data"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1002/2014ja020658"},{"@type":"CROSSREF","@value":"10.1186/s40623-018-0805-9_references_DOI_E7yP4KMWsDFSYDzvsBgLa6K9zmp"},{"@type":"CROSSREF","@value":"10.1186/s40623-018-0864-y_references_DOI_E7yP4KMWsDFSYDzvsBgLa6K9zmp"}]}