High frequency radiation chaotic leader versus return stroke from convection and frontal thunderstorm

Mohamad Suffian , Ahmad (2014) High frequency radiation chaotic leader versus return stroke from convection and frontal thunderstorm. Project Report. UTeM. (Submitted)

Text HIGH FREQUENCY RADIATION CHAOTIC LEADER VERSUS RETURN STROKE FROM CONVECTION 24pages.pdf Download (780kB)

Abstract

Lightning flash is one of the oldest natural phenomenon. Many researcher found that it difficult to understand. During lightning flash, there are several process will happen to complete it. One of the process lightning flash is return stroke. Return stroke shows that its have consistently strongest sources of high frequency radiation. Its also the fastest impulse that transfer charge to the ground. However, chaotic leader is the process of lightning flash that controversial and poorly defined. This chaotic leader also can be appear after or before return stroke . This project more focused return stroke process and chaotic leader process in lightning flash include their characteristics and parameters from waveform display by oscilloscope. Then, it discuss which appeared first between these two type of lightning during lightning flash. For measurement high frequency radiation, the circuit 3MHz and 30MHz were used to determined return stroke and chaotic leader. The measurement for this project were used parallel plate antenna, circuit setup and oscilloscope. Antenna was used for detected the signal and oscilloscope was used for display the signal. High speed buffer LHM6609 was used in this circuit to isolated the high input impedance of the antenna and to delivered a stable signal to the filter circuit while operational amplifier LHM6599 was used to increased the weak input signal. After recorded data measurement, analyze the data and made discussion based on data measurement. Last but not least, making good conclusion and recomendation for improving the project for future work.

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