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A study of cloud-to-ground lightning flashes initiated by fast positive breakdown

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dc.citedby2
dc.contributor.authorSabri M.H.M.en_US
dc.contributor.authorAhmad M.R.en_US
dc.contributor.authorAl-Kahtani A.A.N.en_US
dc.contributor.authorKadir M.Z.A.A.en_US
dc.contributor.authorBaharin S.A.S.en_US
dc.contributor.authorLu G.en_US
dc.contributor.authorZhang H.en_US
dc.contributor.authorWilliams E.en_US
dc.contributor.authorCooray V.en_US
dc.contributor.authorNordin F.H.en_US
dc.contributor.authorid57200560218en_US
dc.contributor.authorid16021287600en_US
dc.contributor.authorid57219739527en_US
dc.contributor.authorid25947297000en_US
dc.contributor.authorid57206727343en_US
dc.contributor.authorid12781228700en_US
dc.contributor.authorid57203311320en_US
dc.contributor.authorid57207137435en_US
dc.contributor.authorid7005428121en_US
dc.contributor.authorid25930510500en_US
dc.date.accessioned2023-05-29T09:36:27Z
dc.date.available2023-05-29T09:36:27Z
dc.date.issued2022
dc.descriptionCharge transfer; Clouds; Interferometers; Lightning; Cloud-to-ground lightning flash; Electric field change; Fast breakdown; Frequency source; High-frequency pulse; Initial breakdown pulse; Initial electric field change; Interferometer narrow bipolar event; Narrow bipolar events; Very high frequency; Antennas; altitude; cloud to ground lightning; electric field; interferometeren_US
dc.description.abstractIn this paper, we examine the initiation event of two tropical negative cloud to ground (CG) lightning flashes within reversal distance (<8 km) detected on 12 (CG1) and 24 (CG2) November 2019, respectively. The CG flashes were recorded using a fast antenna (FA), slow antenna (SA), magnetic field (B-field), and very high frequency (VHF) sensors located at two observation stations (ST1 and ST2) 13.26 km apart. The key finding is that CG1 flash was initiated by a short VHF pulse followed by a VHF burst (fast positive breakdown) while CG2 flash was initiated by a VHF burst (fast positive breakdown) not preceded by a short VHF pulse. The VHF burst was a precursor for initiation of a narrow bipolar event (NBE)-like pulse and initial electric field changes (IECs). Based on the VHF interferometer map, the VHF sources of NBE-like pulses have been propagated upward predominantly vertical. The initiation altitude, total length of the VHF sources propagation, estimated velocity of NBE-like pulse for CG1 flash were 4.5 � 0.5 km, 1.9�3.8 km, and 2.4 � 108 to 4.8 � 108 ms?1, respectively, and for CG2 flash were 5.1 � 0.8 km, 0.2�3.0 km, and 2.7 � 107 to 4.1 � 108 ms?1, respectively. It is evident that IECs process has been initiated during fast positive streamers propagation. It can be suggested that the IECs process resulted from charge transfer during a fast positive breakdown. The durations and magnitudes of IECs for CG1 flash were 248.5 ?s and 27.97 V/m, respectively, and for CG2 flash were 265.8 ?s and 2.31 V/m, respectively. � 2022 Elsevier B.V.en_US
dc.description.natureFinalen_US
dc.identifier.ArtNo106260
dc.identifier.doi10.1016/j.atmosres.2022.106260
dc.identifier.scopus2-s2.0-85130924400
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85130924400&doi=10.1016%2fj.atmosres.2022.106260&partnerID=40&md5=7c22fba2ca93a3e8c344eaf93abd3675
dc.identifier.urihttps://irepository.uniten.edu.my/handle/123456789/26740
dc.identifier.volume276
dc.publisherElsevier Ltden_US
dc.sourceScopus
dc.sourcetitleAtmospheric Research
dc.titleA study of cloud-to-ground lightning flashes initiated by fast positive breakdownen_US
dc.typeArticleen_US
dspace.entity.typePublication
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