Unique Stroke-Multiplicity of Positive Lightning in Malaysia

Hamzah, M. N.; Kadir, Mohd Zainal Abidin Ab; Gomes, Chandima; Arshad, S. N. M.

doi:10.4028/www.scientific.net/amm.793.39

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…Based on data reported by [9], [11] and [12] it can be noted that +CG lightning occurrence in this region are contradicted from the nominal value reported globally. Thus lead to uncertainty on the +CG lightning occurrences in this region.…”

Section: Resultsmentioning

confidence: 72%

“…Table 1 shows the statistical information on +CG flash occurrence in Malaysia and Indonesia. [9], [10], and [11] recorded 21.91%, 2.10% and 33.14% +CG lightning respectively. [9] and [11] shows a significantly high +CG lightning percentage while [10] reported an acceptable value of +CG percentage.…”

Section: Resultsmentioning

confidence: 95%

“…[9], [10], and [11] recorded 21.91%, 2.10% and 33.14% +CG lightning respectively. [9] and [11] shows a significantly high +CG lightning percentage while [10] reported an acceptable value of +CG percentage. [12] discovered a numerous +CG data from a single storm with 102 event which is extraordinary abundance from a single storm.…”

Section: Resultsmentioning

confidence: 95%

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Unravel the extent of the existence of positive ground flash in Malaysia

Munauwer¹

2020

IJETER

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Positive cloud-to-ground flash (+CG) in tropic countries such as Malaysia is not common. However, some studies in Malaysia reported that the +CG in Malaysia occur more than the nominal percentage of 10 %. The uncertainty feature as mentioned above motivates the authors to stratify the +CG from 135 electric field data acquired in two different thunderstorms recorded in Melaka, Malaysia. To ensure consistency of the measurement, the accurate stroke count technique that widely have been used by majority lightning investigators was utilized in Universiti Teknikal Malaysia Melaka measurement station. The electric fields were recorded with nanosecond resolution using High Definition Lecroy. The signal of lightning study within few Hz to tens of MHz, were detected by the combination of parallel plate antenna and voltage follower amplifier. In summary, negative cloud to ground flashes (-CG), +CG and cloud flash (CC) were found to have 123(91%), 6 (4.44%) and 6 (4.44%), respectively. Further, comparison study has shown that there is no consistency in previous studies in Malaysia and Indonesia and lead to uncertainty. Overall, it is extremely important to all researchers in tropical region to realize that the positive lightning has to be scrutinized carefully and still open into a big question in presenting a proper manner.

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Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 95%

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Unravel the extent of the existence of positive ground flash in Malaysia

Munauwer¹

2020

IJETER

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“…Even lightning characteristics in the tropical region itself varies according to the geographical location of the lightning events and type of thunderstorm [11,12]. Apart from that, there are also studies that have been conducted to analyze lightning characteristics based on different lightning types such as negative and positive narrow bipolar pulses [13], negative lightning flashes [14,15], and positive lightning flashes [16]. Besides, lightning data obtained from Malaysia was compared to other regions with different meteorology as reported in [10,17,18].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Diurnal and Nocturnal Lightning Activities in Sarawak, Malaysia

2021

BJoST

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Malaysia has a very high lightning activities rate that had been recorded every year. Yet, there are still too many lightning features that have not been explored in Malaysia especially in the eastern part of the country. This study presented diurnal and nocturnal lightning characteristics recorded in Sibu, Sarawak. The lightning electric field signal was detected using parallel plate antenna. The waveform was analyzed using PicoScope Software. Four important parameters of negative first and subsequent return stroke were measured namely normal electric field peak voltage, zero crossing time, zero to peak rise time and 10 to 90% rise time. Ten samples of diurnal first return stroke and 10 subsequent return strokes were presented in this study. Same amount of samples were measured for nocturnal lightning. Averagely, normal electric field peak voltage and zero crossing time for diurnal lightning were higher for both first and subsequent return strokes compared to nocturnal lightning. Contrarily, zero to peak rise time and 10 to 90% rise time of diurnal lightning were shorter for both first and subsequent return strokes compared to nocturnal type of lightning. The findings in this research conspicuously enhanced the knowledge about the variations of lightning characteristics in Malaysia.

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Lightning severity in Malaysia and some parameters of interest for engineering applications

Kadir

Abidin²

2016

Therm sci

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To the electric utility engineer, the parameters of the flash that are of primary interest are the crest current for the first and subsequent strokes, the waveshape of these currents, correlation between the parameters, the number of strokes per flash and flash incidence rates where the ground flash density, denoted as flashes per square km-year and symbolized by Ng. The first three parameters, as we know them today, are to a very large extent based on the measurements of Berger. Berger's masts, 70 and 80 meters high, were mounted atop Mt. San Salvatore (Switzerland), which is 650 meters above Lake Lugano, where it can be readily noted that these 125 records represent one of the best and most extensive set of data available to the industry to date. This paper focuses on the lightning severity scenario in Malaysia, which could also applicable to other tropic countries, and some of the useful parameters for lightning protection system design and forensic study. Some specific engineering applications have also been summarised, taking into account various lightning parameters, available from past and current measurements available.

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Unique Stroke-Multiplicity of Positive Lightning in Malaysia

Cited by 3 publications

References 19 publications

Unravel the extent of the existence of positive ground flash in Malaysia

Unravel the extent of the existence of positive ground flash in Malaysia

Characteristics of Diurnal and Nocturnal Lightning Activities in Sarawak, Malaysia

Lightning severity in Malaysia and some parameters of interest for engineering applications

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