Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/77474
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dc.contributorDepartment of Building Services Engineering-
dc.creatorGou, X-
dc.creatorChen, M-
dc.creatorZhang, G-
dc.date.accessioned2018-08-28T01:32:36Z-
dc.date.available2018-08-28T01:32:36Z-
dc.identifier.issn2169-897X-
dc.identifier.urihttp://hdl.handle.net/10397/77474-
dc.language.isoenen_US
dc.publisherWiley-Blackwellen_US
dc.rights©2018. American Geophysical Union. All Rights Reserved.en_US
dc.subjectAF and FF scaling methodsen_US
dc.subjectDFA analysisen_US
dc.subjectLightning flashen_US
dc.subjectVHF radiationen_US
dc.titleTime correlations of lightning flash sequences in thunderstorms revealed by fractal analysisen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.spage1351-
dc.identifier.epage1362-
dc.identifier.volume123-
dc.identifier.issue2-
dc.identifier.doi10.1002/2017JD027206-
dcterms.abstractBy using the data of lightning detection and ranging system at the Kennedy Space Center, the temporal fractal and correlation of interevent time series of lightning flash sequences in thunderstorms have been investigated with Allan factor (AF), Fano factor (FF), and detrended fluctuation analysis (DFA) methods. AF, FF, and DFA methods are powerful tools to detect the time-scaling structures and correlations in point processes. Totally 40 thunderstorms with distinguishing features of a single-cell storm and apparent increase and decrease in the total flash rate were selected for the analysis. It is found that the time-scaling exponents for AF (αAF) and FF (αFF) analyses are 1.62 and 0.95 in average, respectively, indicating a strong time correlation of the lightning flash sequences. DFA analysis shows that there is a crossover phenomenon—a crossover timescale (τc) ranging from 54 to 195 s with an average of 114 s. The occurrence of a lightning flash in a thunderstorm behaves randomly at timescales <τc but shows strong time correlation at scales >τc. Physically, these may imply that the establishment of an extensive strong electric field necessary for the occurrence of a lightning flash needs a timescale >τc, which behaves strongly time correlated. But the initiation of a lightning flash within a well-established extensive strong electric field may involve the heterogeneities of the electric field at a timescale <τc, which behave randomly.-
dcterms.accessRightsopen accessen_US
dcterms.bibliographicCitationJournal of geophysical research. Atmospheres, 27 Jan. 2018, v. 123, no. 2, p. 1351-1362-
dcterms.isPartOfJournal of geophysical research. Atmospheres-
dcterms.issued2018-01-27-
dc.identifier.isiWOS:000425520200043-
dc.identifier.scopus2-s2.0-85041129649-
dc.identifier.eissn2169-8996-
dc.identifier.rosgroupid2017005945-
dc.description.ros2017-2018 > Academic research: refereed > Publication in refereed journal-
dc.description.validate201808 bcrc-
dc.description.oaVersion of Recorden_US
dc.identifier.FolderNumbera0806-n05en_US
dc.identifier.SubFormID1910en_US
dc.description.fundingSourceRGCen_US
dc.description.fundingTextPolyU 152139/15Een_US
dc.description.pubStatusPublisheden_US
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