{"@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/1361699994119604480.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/1998ja900062"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F1998JA900062"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/1998JA900062"}}],"dc:title":[{"@value":"First evidence at high latitudes for the ionospheric Alfvén resonator"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>A high‐sensitive, two‐component induction magnetometer was used to measure natural electromagnetic background noise in the frequency range 0.1–10 Hz. The measurements were carried out in Kilpisjärvi/Finland (geographic latitude 69.02° N, longitude 20.87° E, L ∼ 6) in 1993. The average dynamic spectra were derived for four senses of polarization (two linear N‐S and E‐W and two circular R and L) with a spectral resolution of 0.1 Hz and time resolution of 20 min. During at least 4 out of 12 nights covered by the measurements, clear evidence of spectral resonance structures (SRS) known from midlatitude observations were seen in the magnetic noise spectra. As a rule, 3–4 spectral maxima were observed. The frequency spacing Δ<jats:italic>F</jats:italic> of SRS between the spectral peaks in the SRS varied between ∼ 0.5 and ∼ 1.5 Hz. The ratio of amplitudes between spectral maxima and minima constituting the SRS was about 2. The diurnal variation of Δ<jats:italic>F</jats:italic> did not differ in principle from the one observed at midlatitudes. The sense of polarization of the SRS signal varied between right‐handed circular and linear with an arbitrary orientation of the magnetic axis. Electron density measurements in the ionospheric <jats:italic>F</jats:italic> region support the view that the SRS are due to the effect of the ionospheric Alfvén resonator.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380584341816370435","@type":"Researcher","foaf:name":[{"@value":"PP Belyaev"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"01480227"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Space Physics"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"1999-03","prism:volume":"104","prism:number":"A3","prism:startingPage":"4305","prism:endingPage":"4317"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F1998JA900062"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/1998JA900062"}],"createdAt":"2002-09-17","modifiedAt":"2023-11-22","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050579521722273280","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Two‐Dimensional Local Modeling of Thermospheric Heating and Neutral Mass Density Enhancement Driven by Alfvén Waves"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004229808180096","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Ionospheric Alfvén resonator observed at low‐latitude ground station, Muroto"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285708881934720","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Hybrid Alfvén resonant mode generation in the magnetosphere-ionosphere coupling system"}]},{"@id":"https://cir.nii.ac.jp/crid/1360306905153724544","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Statistics of Higher Harmonics SRS at Low Latitude Station, Shillong"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567179754078080","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"The origin of spectral resonance structures of the ionospheric Alfvén resonator. Single high‐altitude reflection or resonant cavity excitation?"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567184382167680","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Characterization and demonstration results of a SQUID magnetometer system developed for geomagnetic field measurements"}]},{"@id":"https://cir.nii.ac.jp/crid/1360584341816370304","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"New observational projects in New Zealand for studying radiation belt loss processes in the deep inner magnetosphere: instrumentation, operation by solar power and initial results"}]},{"@id":"https://cir.nii.ac.jp/crid/1390861847633920640","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Observation of Geomagnetic Fields Using Superconducting Interference Device Magnetometer"},{"@language":"ja","@value":"超伝導量子干渉素子（SQUID）磁力計を用いた地磁気観測"}]},{"@id":"https://cir.nii.ac.jp/crid/2051714792015364992","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Observation of ionospheric Alfven resonator with double spectral resonance structures at low latitude station, Shillong (dipoleL=1.08)"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/1998ja900062"},{"@type":"CROSSREF","@value":"10.1002/2017ja024204_references_DOI_18ZG6BQUQUKtISZaUQgBEyxBdtB"},{"@type":"CROSSREF","@value":"10.1029/2021ja030189_references_DOI_18ZG6BQUQUKtISZaUQgBEyxBdtB"},{"@type":"CROSSREF","@value":"10.1063/1.4759016_references_DOI_18ZG6BQUQUKtISZaUQgBEyxBdtB"},{"@type":"CROSSREF","@value":"10.2221/jcsj.59.19_references_DOI_18ZG6BQUQUKtISZaUQgBEyxBdtB"},{"@type":"CROSSREF","@value":"10.1029/2024ja033034_references_DOI_18ZG6BQUQUKtISZaUQgBEyxBdtB"},{"@type":"CROSSREF","@value":"10.1002/2013ja019428_references_DOI_18ZG6BQUQUKtISZaUQgBEyxBdtB"},{"@type":"CROSSREF","@value":"10.1088/1361-6668/aa733f_references_DOI_18ZG6BQUQUKtISZaUQgBEyxBdtB"},{"@type":"CROSSREF","@value":"10.1186/s40623-024-01990-0_references_DOI_18ZG6BQUQUKtISZaUQgBEyxBdtB"},{"@type":"CROSSREF","@value":"10.1186/s40623-022-01730-2_references_DOI_18ZG6BQUQUKtISZaUQgBEyxBdtB"}]}