Shamsul Ammar Shamsul Baharin, Mohd Riduan Ahmad, Taha Raad Khaleel Al-Shaikhli, Muhammad Haziq Mohammad Sabri, Ammar Al-Kahtani, Sulaiman Ali Mohamad, V. Cooray, Muhammad Abu Bakar Sidik
{"title":"Microwave and Very High Frequency Radiations of The First Narrow Initial Breakdown","authors":"Shamsul Ammar Shamsul Baharin, Mohd Riduan Ahmad, Taha Raad Khaleel Al-Shaikhli, Muhammad Haziq Mohammad Sabri, Ammar Al-Kahtani, Sulaiman Ali Mohamad, V. Cooray, Muhammad Abu Bakar Sidik","doi":"10.1109/ICLPandSIPDA54065.2021.9627385","DOIUrl":null,"url":null,"abstract":"This paper reports the observation of microwave and very high frequency (VHF) radiation pulses associated with the first narrow (<10us) initial breakdown (IB) pulses of ten negative cloud-to-ground (-CG) flashes. The centre frequency of microwave and VHF sensors was 0.97 GHz and 60 MHz, respectively. We found that all microwave pulses were the initiation event led the first VHF pulses ranging between 0.03187 and 2.57968 µs and led the first narrow IB pulses ranging between 0.02382 and 2.70202 µs. Half of the VHF pulses were observed to lead the first narrow IB pulses ranging between 0.03453 and 0.128 µs. Moreover, polarity of microwave radiation pulses was always positive while the polarity of the first narrow IB pulses always negative. On the other hand, half of VHF radiation pulses had the same polarity as microwave radiation pulses.","PeriodicalId":70714,"journal":{"name":"中国防雷","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2021-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"中国防雷","FirstCategoryId":"1089","ListUrlMain":"https://doi.org/10.1109/ICLPandSIPDA54065.2021.9627385","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
This paper reports the observation of microwave and very high frequency (VHF) radiation pulses associated with the first narrow (<10us) initial breakdown (IB) pulses of ten negative cloud-to-ground (-CG) flashes. The centre frequency of microwave and VHF sensors was 0.97 GHz and 60 MHz, respectively. We found that all microwave pulses were the initiation event led the first VHF pulses ranging between 0.03187 and 2.57968 µs and led the first narrow IB pulses ranging between 0.02382 and 2.70202 µs. Half of the VHF pulses were observed to lead the first narrow IB pulses ranging between 0.03453 and 0.128 µs. Moreover, polarity of microwave radiation pulses was always positive while the polarity of the first narrow IB pulses always negative. On the other hand, half of VHF radiation pulses had the same polarity as microwave radiation pulses.