{"@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/1360021391860660736.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2023ja031809"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2023JA031809"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Investigation of the Occurrence Characteristics and Possible Origins of Daytime Spread F Irregularities in Low Latitude Region"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>A study of occurrence characteristics and morphology of daytime spread F (DSF) irregularities was conducted using ionosonde from 2013 to 2020 over low‐latitude Puer station in the China sector. In this study, a day with two or more consecutive F‐region diffuse echo ionograms within one hour from local sunrise to sunset at an altitude of 250 km is considered a DSF day. The results show that the DSF irregularities observed in different solar activity years have a similar seasonal distribution, manifesting as frequent occurrences in June solstice with a maximum occurrence near sunrise. Furthermore, the morphology of most DSFs on the ionograms is predominantly frequency spread F, with a few observed near sunrise as MSF and RSF. In contrast to in high solar activity years (HSAY, 2013–2015), an interesting phenomenon of DSF irregularities in low solar activity years (LSAY, 2016–2020) is presented. That is, in the late afternoon hours (15–18 LT), DSFs have an unexpectedly high occurrence rate during the December solstice. By analyzing the virtual height variations for iso‐frequency plots of the DSF event occurring in the afternoon, these DSF irregularities were found to be likely associated with daytime medium‐scale traveling ionospheric disturbances (MSTIDs). Compared with the observed characteristics of the nighttime spread F, the fossils of nighttime plasma bubbles irregularities might play a key role in the development of DSF occurring in the early morning. At the same time, the influence of daytime MSTIDs on DSF irregularities occurring in the late afternoon hours cannot be ignored.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021391860660611","@type":"Researcher","foaf:name":[{"@value":"Lehui Wei"}],"jpcoar:affiliationName":[{"@value":"School of Electronic Information Wuhan University  Wuhan China"},{"@value":"Research Institute for Sustainable Humanosphere Kyoto University  Uji Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391860660612","@type":"Researcher","foaf:name":[{"@value":"Chunhua Jiang"}],"jpcoar:affiliationName":[{"@value":"School of Electronic Information Wuhan University  Wuhan China"}]},{"@id":"https://cir.nii.ac.jp/crid/1420001326219429376","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"30397525"},{"@type":"NRID","@value":"1000030397525"},{"@type":"ORCID","@value":"0000-0001-8392-6455"},{"@type":"NRID","@value":"9000408855570"},{"@type":"NRID","@value":"9000242390244"},{"@type":"NRID","@value":"9000414347587"},{"@type":"NRID","@value":"9000313628899"},{"@type":"NRID","@value":"9000310328134"},{"@type":"NRID","@value":"9000413694785"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/tatsuhiro_yokoyama"}],"foaf:name":[{"@value":"Tatsuhiro Yokoyama"}],"jpcoar:affiliationName":[{"@value":"Research Institute for Sustainable Humanosphere Kyoto University  Uji Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391860660609","@type":"Researcher","foaf:name":[{"@value":"Jing Liu"}],"jpcoar:affiliationName":[{"@value":"China Earthquake Administration Institute of Earthquake Science  Beijing China"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391860660608","@type":"Researcher","foaf:name":[{"@value":"Guobin Yang"}],"jpcoar:affiliationName":[{"@value":"School of Electronic Information Wuhan University  Wuhan China"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391860660610","@type":"Researcher","foaf:name":[{"@value":"Yaogai Hu"}],"jpcoar:affiliationName":[{"@value":"School of Electronic Information Wuhan University  Wuhan China"}]}],"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":"2023-12-26","prism:volume":"129","prism:number":"1"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2023JA031809"}],"createdAt":"2023-12-26","modifiedAt":"2025-05-01","project":[{"@id":"https://cir.nii.ac.jp/crid/1040013087501233280","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"22K21345"},{"@type":"JGN","@value":"JP22K21345"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22K21345/"}],"notation":[{"@language":"ja","@value":"国際地上観測網と人工衛星観測・モデリングに基づくジオスペース変動の国際共同研究"},{"@language":"en","@value":"International joint research of geospace variability by combining multi-point ground and satellite observations and modeling"}]},{"@id":"https://cir.nii.ac.jp/crid/1040287907230717312","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"21H04518"},{"@type":"JGN","@value":"JP21H04518"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21H04518/"}],"notation":[{"@language":"ja","@value":"地上多点ネットワークに基づく超高層大気変動の緯度間結合の観測的研究"},{"@language":"en","@value":"Study of latitudinal coupling of upper atmospheric variations based on multi-point ground network observations"}]},{"@id":"https://cir.nii.ac.jp/crid/1040848250647691776","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"20H00197"},{"@type":"JGN","@value":"JP20H00197"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20H00197/"}],"notation":[{"@language":"ja","@value":"レーダー観測網・複数衛星・モデル計算を総合した赤道域電離圏変動特性の国際共同研究"},{"@language":"en","@value":"International study of equatorial ionosphere based on observations and models"}]},{"@id":"https://cir.nii.ac.jp/crid/1040848250652926592","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"20K04037"},{"@type":"JGN","@value":"JP20K04037"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20K04037/"}],"notation":[{"@language":"ja","@value":"全球・局所電離圏モデルの階層的結合による電離圏擾乱現象の解明と発生予測"},{"@language":"en","@value":"Study of ionospheric disturbances by coupling of global and local ionospheric numerical models"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360011145123843456","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Linear theory and modeling of the Rayleigh‐Taylor instability leading to the occurrence of equatorial spread <i>F</i>"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021392652864128","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"An automatic scaling technique for obtaining <i>F</i><sub>2</sub> parameters and <i>F</i><sub>1</sub> critical frequency from vertical incidence ionograms"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021392653226496","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Observational study of daytime ionospheric irregularities associated with typhoon"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021392653456256","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Space radiation environment in low earth orbit during solar-activity minimum period from 2006 through 2011"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021392653741568","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Daytime Equatorial Spread F‐Like Irregularities Detected by HF Doppler Receiver and Digisonde"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021393305687296","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"The variation of equatorial spread-F occurrences observed by ionosondes at Thailand longitude sector"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021393305758080","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"A method for the automatic calculation of electron density profiles from vertical incidence ionograms"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021393305980800","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"The Occurrence Characteristics of Daytime Irregularities in the Low Latitude Topside F Region at Solar Minimum Revealed by ICON"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021393307023872","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"On the solar activity dependence of midnight equatorial plasma bubbles during June solstice periods"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021393307093120","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"The Low-Latitude Plasma Irregularities after Sunrise from Multiple Observations in Both Hemispheres during the Recovery Phase of a Storm"}]},{"@id":"https://cir.nii.ac.jp/crid/1360282588960845824","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Daytime Evolution of Equatorial Plasma Bubbles Observed by the First Republic of China Satellite"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292620327394560","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Some aspects of mid-latitude spread-Es, and its relationship with spread-F"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292621611219328","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Software for scaling and analysis of vertical incidence ionograms-ionoScaler"}]},{"@id":"https://cir.nii.ac.jp/crid/1360294647841184768","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Modeling ionospheric disturbance features in quasi‐vertically incident ionograms using 3‐D magnetoionic ray tracing and atmospheric gravity waves"}]},{"@id":"https://cir.nii.ac.jp/crid/1360302871321932416","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Histogram-based ionogram displays and their application to autoscaling"}]},{"@id":"https://cir.nii.ac.jp/crid/1360302871322357632","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Unexpected High Occurrence of Daytime F‐Region Backscatter Plume Structures Over Low Latitude Sanya and Their Possible Origin"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567179757530496","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Fresh and evolutionary‐type field‐aligned irregularities generated near sunrise terminator due to overshielding electric fields"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574093900553856","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Interferometric and dual beam observations of daytime Spread‐<i>F</i>‐like irregularities over Jicamarca"}]},{"@id":"https://cir.nii.ac.jp/crid/1360865821276338944","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"A Low-Power and Small-Size HF Backscatter Radar for Ionospheric Sensing"}]},{"@id":"https://cir.nii.ac.jp/crid/1360865821276659072","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"A Method for Automatic Inversion of Oblique Ionograms"}]},{"@id":"https://cir.nii.ac.jp/crid/1360865821454739328","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Ionosonde observations of daytime spread F at middle latitudes during a geomagnetic storm"}]},{"@id":"https://cir.nii.ac.jp/crid/1360865821455018368","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Origin and Distribution of Daytime Electron Density Irregularities in the Low‐Latitude <i>F</i> Region"}]},{"@id":"https://cir.nii.ac.jp/crid/1360865821455026304","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Observations of Unusual Daytime Range Spread F at Middle Latitude During the Afternoon Hours"}]},{"@id":"https://cir.nii.ac.jp/crid/1360865821455290624","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Cusp Type Anomalies in Variable Frequency Ionospheric Records"}]},{"@id":"https://cir.nii.ac.jp/crid/1361418519003678720","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Spread-F-like irregularities observed by the Jicamarca radar during the day-time"}]},{"@id":"https://cir.nii.ac.jp/crid/1361418519762527744","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Ionosonde observations of daytime spread <i>F</i> at low latitudes"}]},{"@id":"https://cir.nii.ac.jp/crid/1362262945374189696","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Outstanding problems in the equatorial ionosphere–thermosphere electrodynamics relevant to spread F"}]},{"@id":"https://cir.nii.ac.jp/crid/1362544419848658560","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Climatology of medium-scale traveling ionospheric disturbances observed by a GPS network in central China"}]},{"@id":"https://cir.nii.ac.jp/crid/1363107370414337024","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"The correlation of longitudinal/seasonal variations of evening equatorial pre-reversal drift and of plasma bubbles"}]},{"@id":"https://cir.nii.ac.jp/crid/1363388845354791808","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"On the occurrence of postmidnight equatorial<i>F</i>region irregularities during the June solstice"}]},{"@id":"https://cir.nii.ac.jp/crid/1363670320263394304","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Plasma bubbles in the topside ionosphere: Estimations of the survival possibility"}]},{"@id":"https://cir.nii.ac.jp/crid/1364233268251329152","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Scattering of radio waves by the <i>F</i>‐region of the ionosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1364233268394767232","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Mid‐latitude ionospheric irregularities persisting into late morning during the magnetic storm on 19 March 2001"}]},{"@id":"https://cir.nii.ac.jp/crid/1364233268921013632","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Long‐lasting daytime equatorial plasma bubbles observed by the C/NOFS satellite"}]},{"@id":"https://cir.nii.ac.jp/crid/1370021391860660616","@type":"Product","relationType":["references"]},{"@id":"https://cir.nii.ac.jp/crid/1370021391860660618","@type":"Product","relationType":["references"]},{"@id":"https://cir.nii.ac.jp/crid/2050588892082784256","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Spread-F occurrences and relationships with foF2 and h'F at low- and mid-latitudes in China"}]},{"@id":"https://cir.nii.ac.jp/crid/2051433317024398720","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Statistical analysis of low-latitude spread F observed over Puer, China, during 2015–2016"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/2023ja031809"},{"@type":"KAKEN","@value":"PRODUCT-24998360"},{"@type":"KAKEN","@value":"PRODUCT-25203596"},{"@type":"KAKEN","@value":"PRODUCT-24842184"},{"@type":"KAKEN","@value":"PRODUCT-25348739"}]}