| CHARACTERISTICS OF LARGE PULSES OF RADIATED FIELDS FROM CLOUD FLASH DISCHARGES |
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| 作者姓名： | 祝宝友 陶善昌 |
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| 作者单位： | Department of Earth and Space Sciences University of Science and Technology of China.Hefei 230026，Department of Earth and Space Sciences，University of Science and Technology of China.Hefei 230026 |
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| 基金项目： | the National Natural Science Foundation of China. |
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| 摘 要： | Observations show that the sequences of microsecond-scale pulses are produced in cloud flashdischarge processes.In the present work we report on measurements of larger bipolar pulses(LBP)of the radiation fields which are classified into four types according to their waveshapes andpolarities of initial peak.Either positive or negative pulse contains two kinds of waveshapes:onewith a smooth rise and the other with 2 or 3 fast-rising pulse superimposed on the initial half cycle.The pulse waveshape characteristics in both time and frequency domains are as follows.Among2908 samples there are 45% of the positive polarity and 55% of the negative polarity.The positivepulses tend to have distinctly smaller values than negative pulses in rise time,half width and zero-crossing time of the initial peak.The peaks of positive pulse spectra tend to occur at a higherfrequency than those of negative pulses.Despite differences above,positive and negative pulseshave a similar total duration.
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CHARACTERISTICS OF LARGE PULSES OF RADIATED FIELDS FROM CLOUD FLASH DISCHARGES |
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| Zhu Baoyou Tao Shanchang.CHARACTERISTICS OF LARGE PULSES OF RADIATED FIELDS FROM CLOUD FLASH DISCHARGES[J].Acta Meteorologica Sinica,1997(3). |
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| Authors: | Zhu Baoyou Tao Shanchang |
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| Institution: | Zhu Baoyou Tao Shanchang Department of Earth and Space Sciences,University of Science and Technology of China.Hefei 230026 |
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| Abstract: | Observations show that the sequences of microsecond-scale pulses are produced in cloud flash discharge processes.In the present work we report on measurements of larger bipolar pulses (LBP)of the radiation fields which are classified into four types according to their waveshapes and polarities of initial peak.Either positive or negative pulse contains two kinds of waveshapes:one with a smooth rise and the other with 2 or 3 fast-rising pulse superimposed on the initial half cycle. The pulse waveshape characteristics in both time and frequency domains are as follows.Among 2908 samples there are 45% of the positive polarity and 55% of the negative polarity.The positive pulses tend to have distinctly smaller values than negative pulses in rise time,half width and zero- crossing time of the initial peak.The peaks of positive pulse spectra tend to occur at a higher frequency than those of negative pulses.Despite differences above,positive and negative pulses have a similar total duration. |
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| Keywords: | thunderstorm cloud flash larger bipolar pulse statistical characteristics |
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