{"@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/1360004239674167040.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.3847/1538-4357/aa8c75"}},{"identifier":{"@type":"URI","@value":"http://stacks.iop.org/0004-637X/848/i=1/a=62/pdf"}},{"identifier":{"@type":"URI","@value":"http://stacks.iop.org/0004-637X/848/i=1/a=62?key=crossref.4234a63198ffda1c1814bda75834f803"}},{"identifier":{"@type":"URI","@value":"https://iopscience.iop.org/article/10.3847/1538-4357/aa8c75"}},{"identifier":{"@type":"URI","@value":"https://iopscience.iop.org/article/10.3847/1538-4357/aa8c75/pdf"}},{"identifier":{"@type":"DOI","@value":"10.48550/arxiv.1709.03695"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Variation of the Solar Microwave Spectrum in the Last Half Century"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>The total solar fluxes at 1, 2, 3.75, and 9.4 GHz were observed continuously from 1957 to 1994 at Toyokawa, Japan, and from 1994 until now at Nobeyama, Japan, with the current Nobeyama Radio Polarimeters. We examined the multi-frequency and long-term data sets, and found that not only the microwave solar flux but also its monthly standard deviation indicate the long-term variation of solar activity. Furthermore, we found that the microwave spectra at the solar minima of Cycles 20–24 agree with each other. These results show that the average atmospheric structure above the upper chromosphere in the quiet-Sun has not varied for half a century, and suggest that the energy input for atmospheric heating from the sub-photosphere to the corona have not changed in the quiet-Sun despite significantly differing strengths of magnetic activity in the last five solar cycles.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420845751135047168","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"00332164"},{"@type":"NRID","@value":"1000000332164"},{"@type":"NRID","@value":"9000392872870"},{"@type":"NRID","@value":"9000253258004"},{"@type":"NRID","@value":"9000000042557"},{"@type":"NRID","@value":"9000017102025"},{"@type":"NRID","@value":"9000014146661"},{"@type":"NRID","@value":"9000297506155"},{"@type":"NRID","@value":"9000022891801"},{"@type":"NRID","@value":"9000022891789"},{"@type":"NRID","@value":"9000022891796"},{"@type":"NRID","@value":"9000018163087"},{"@type":"NRID","@value":"9000283589267"},{"@type":"NRID","@value":"9000331900933"},{"@type":"NRID","@value":"9000237857997"},{"@type":"NRID","@value":"9000015330873"},{"@type":"NRID","@value":"9000000121417"},{"@type":"NRID","@value":"9000257693104"},{"@type":"NRID","@value":"9000244901548"},{"@type":"NRID","@value":"9000014144407"},{"@type":"NRID","@value":"9000366128513"},{"@type":"NRID","@value":"9000244901184"},{"@type":"NRID","@value":"9000334737610"},{"@type":"NRID","@value":"9000277507971"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0080842"}],"foaf:name":[{"@value":"Masumi Shimojo"}]},{"@id":"https://cir.nii.ac.jp/crid/1420845751157761152","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"00725848"},{"@type":"NRID","@value":"1000000725848"},{"@type":"NRID","@value":"9000316622609"},{"@type":"NRID","@value":"9000402095434"},{"@type":"NRID","@value":"9000414073597"},{"@type":"NRID","@value":"9000282785533"},{"@type":"NRID","@value":"9000316616972"},{"@type":"NRID","@value":"9000409204670"},{"@type":"NRID","@value":"9000366128511"},{"@type":"NRID","@value":"9000276143494"},{"@type":"NRID","@value":"9000415040377"},{"@type":"NRID","@value":"9000403296411"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/k.iwai"}],"foaf:name":[{"@value":"Kazumasa Iwai"}]},{"@id":"https://cir.nii.ac.jp/crid/1420282801198325760","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"50390620"},{"@type":"NRID","@value":"1000050390620"},{"@type":"ORCID","@value":"0000-0002-5279-686X"},{"@type":"NRID","@value":"9000297477011"},{"@type":"NRID","@value":"9000006022792"},{"@type":"NRID","@value":"9000018787232"},{"@type":"NRID","@value":"9000237870900"},{"@type":"NRID","@value":"9000285477519"},{"@type":"NRID","@value":"9000408815765"},{"@type":"NRID","@value":"9000237870351"},{"@type":"NRID","@value":"9000019088804"},{"@type":"NRID","@value":"9000237871154"},{"@type":"NRID","@value":"9000237871285"},{"@type":"NRID","@value":"9000014146655"},{"@type":"NRID","@value":"9000237870960"},{"@type":"NRID","@value":"9000015278268"},{"@type":"NRID","@value":"9000241510810"},{"@type":"NRID","@value":"9000022832366"},{"@type":"NRID","@value":"9000237871190"},{"@type":"NRID","@value":"9000240198634"},{"@type":"NRID","@value":"9000000988647"},{"@type":"NRID","@value":"9000237857991"},{"@type":"NRID","@value":"9000408828501"},{"@type":"NRID","@value":"9000408828510"},{"@type":"NRID","@value":"9000237870350"},{"@type":"NRID","@value":"9000237871333"},{"@type":"NRID","@value":"9000014151542"},{"@type":"NRID","@value":"9000237871309"},{"@type":"NRID","@value":"9000241163075"},{"@type":"NRID","@value":"9000237870985"},{"@type":"NRID","@value":"9000237871166"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/asai_ayumi"}],"foaf:name":[{"@value":"Ayumi 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Saito"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"0004637X"},{"@type":"EISSN","@value":"15384357"}],"prism:publicationName":[{"@value":"The Astrophysical Journal"}],"dc:publisher":[{"@value":"American Astronomical Society"}],"prism:publicationDate":"2017-10-10","prism:volume":"848","prism:number":"1","prism:startingPage":"62"},"reviewed":"false","dc:rights":["https://iopscience.iop.org/page/copyright","https://iopscience.iop.org/info/page/text-and-data-mining"],"url":[{"@id":"http://stacks.iop.org/0004-637X/848/i=1/a=62/pdf"},{"@id":"http://stacks.iop.org/0004-637X/848/i=1/a=62?key=crossref.4234a63198ffda1c1814bda75834f803"},{"@id":"https://iopscience.iop.org/article/10.3847/1538-4357/aa8c75"},{"@id":"https://iopscience.iop.org/article/10.3847/1538-4357/aa8c75/pdf"}],"createdAt":"2017-10-12","modifiedAt":"2025-06-26","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=Astrophysics%20-%20Solar%20and%20Stellar%20Astrophysics","dc:title":"Astrophysics - Solar and 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climate"}]},{"@id":"https://cir.nii.ac.jp/crid/1040000781962576128","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"17K00958"},{"@type":"JGN","@value":"JP17K00958"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17K00958/"}],"notation":[{"@language":"ja","@value":"分光観測を深化させた太陽観測システムの科学教育への導入"},{"@language":"en","@value":"Development of self-made spectrometer for solar physics education"}]},{"@id":"https://cir.nii.ac.jp/crid/1040000781965588224","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"17K05397"},{"@type":"JGN","@value":"JP17K05397"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17K05397/"}],"notation":[{"@language":"ja","@value":"太陽フレアにおける粒子加速領域の特定"},{"@language":"en","@value":"The search for the acceleration site in a solar 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