A study of cloud-to-ground lightning flashes initiated by fast positive breakdown
Charge 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...
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2023
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my.uniten.dspace-267402023-05-29T17:36:27Z A study of cloud-to-ground lightning flashes initiated by fast positive breakdown Sabri M.H.M. Ahmad M.R. Al-Kahtani A.A.N. Kadir M.Z.A.A. Baharin S.A.S. Lu G. Zhang H. Williams E. Cooray V. Nordin F.H. 57200560218 16021287600 57219739527 25947297000 57206727343 12781228700 57203311320 57207137435 7005428121 25930510500 Charge 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; interferometer In 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. Final 2023-05-29T09:36:27Z 2023-05-29T09:36:27Z 2022 Article 10.1016/j.atmosres.2022.106260 2-s2.0-85130924400 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85130924400&doi=10.1016%2fj.atmosres.2022.106260&partnerID=40&md5=7c22fba2ca93a3e8c344eaf93abd3675 https://irepository.uniten.edu.my/handle/123456789/26740 276 106260 Elsevier Ltd Scopus |
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Charge 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; interferometer |
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57200560218 |
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57200560218 Sabri M.H.M. Ahmad M.R. Al-Kahtani A.A.N. Kadir M.Z.A.A. Baharin S.A.S. Lu G. Zhang H. Williams E. Cooray V. Nordin F.H. |
| format |
Article |
| author |
Sabri M.H.M. Ahmad M.R. Al-Kahtani A.A.N. Kadir M.Z.A.A. Baharin S.A.S. Lu G. Zhang H. Williams E. Cooray V. Nordin F.H. |
| spellingShingle |
Sabri M.H.M. Ahmad M.R. Al-Kahtani A.A.N. Kadir M.Z.A.A. Baharin S.A.S. Lu G. Zhang H. Williams E. Cooray V. Nordin F.H. A study of cloud-to-ground lightning flashes initiated by fast positive breakdown |
| author_sort |
Sabri M.H.M. |
| title |
A study of cloud-to-ground lightning flashes initiated by fast positive breakdown |
| title_short |
A study of cloud-to-ground lightning flashes initiated by fast positive breakdown |
| title_full |
A study of cloud-to-ground lightning flashes initiated by fast positive breakdown |
| title_fullStr |
A study of cloud-to-ground lightning flashes initiated by fast positive breakdown |
| title_full_unstemmed |
A study of cloud-to-ground lightning flashes initiated by fast positive breakdown |
| title_sort |
study of cloud-to-ground lightning flashes initiated by fast positive breakdown |
| publisher |
Elsevier Ltd |
| publishDate |
2023 |
| _version_ |
1806423401656483840 |
| score |
13.214268 |