Positive Charge Region in Lower Part of Thunderstorm and Preliminary Breakdown Process of Negative Cloud-to-Ground Lightning-中国期刊网

摘要 Anewlightninglocatingtechnology,calledLightningMappingArray(LMA),hasbeendeveloped.ThesystemtakesadvantageofGPStechnologytomeasurethetimesofarrival(TOA)oflightningimpulsiveveryhighfrequency(VHF)radiationeventsateachremotelocation.Thespatiotemporaldevelopmentprocessesoflightningaredescribedinthree-dimensionbymeasurementofthesystemwithhightimeresolution(50ns)andspaceprecision(50-100m).Thechargestructuresinthunderstormandtheirrelationshipwithlightningdischargeprocessesarerevealed.Thetemporalandspatialcharacteristicsofpreliminarybreakdownprocessinvolvedinnegativecloud-to-ground(CG)lightningdischargesareanalyzedbasedonthedataoflightningVHFradiationevents.TheeffectofpositivechargeregioninlowerpartofthunderstormontheoccurrenceofnegativeCGlightningdischargeisdiscussed.TheresultsindicatethatthepreliminarybreakdownprocesswithlongerdurationinnegativeCGlightningdischargesisanintraclouddischargeprocess.Itoccursbetweennegativeandpositivechargeregionslocatedinmiddleandlowerpartsofthunderstormrespectively.Itinitiatesfromthenegativechargeregionandpropagatesdownward.Afterpropagatingintothepositivechargeregion,thelightningchanneldevelopshorizontally.Thecharacteristicsofthepreliminarybreakdownprocessareconsistentwiththatofintracloudlightningdischarges.ThesteppedleadersareinitiatedbytheKtypebreakdownwhichoccursinthelaststageofthepreliminarybreakdownprocessanddevelopsdownwardthroughthepositivechargeregion.TheexistenceofpositivechargeregioninlowerpartofthunderstormresultsintheoccurrenceofpreliminarybreakdownprocesswithlongerdurationbeforethereturnstrokeofnegativeCGlightningdischarges.

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Positive Charge Region in Lower Part of Thunderstorm and Preliminary Breakdown Process of Negative Cloud-to-Ground Lightning

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Positive Charge Region in Lower Part of Thunderstorm and Preliminary Breakdown Process of Negative Cloud-to-Ground Lightning

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