Audible thunder characteristic and the relation between peak frequency and lightning parameters
In recent summers, some natural lightning optical spectra and audible thunder signals were observed. Twelve events on 15 August 2008 are selected as samples since some synchronizing information about them are obtained, such as lightning optical spectra, surface E-field changes, etc. By using digital...
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| Veröffentlicht in: | Journal of Earth System Science 2012-02, Vol.121 (1), p.211-220 |
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| creator | YUHUA, OUYANG PING, YUAN |
| description | In recent summers, some natural lightning optical spectra and audible thunder signals were observed. Twelve events on 15 August 2008 are selected as samples since some synchronizing information about them are obtained, such as lightning optical spectra, surface E-field changes, etc. By using digital filter and Fourier transform, thunder frequency spectra in observation location have been calculated. Then the two main propagation effects, finite amplitude propagation and attenuation by air, are calculated. Upon that we take the test thunder frequency spectra and work backward to recalculate the original frequency spectra near generation location. Thunder frequency spectra and the frequency distribution varying with distance are researched. According to the theories on plasma, the channel temperature and electron density are further calculated by transition parameters of lines in lightning optical spectra. Pressure and the average ionization degree of each discharge channel are obtained by using Saha equations, charge conservation equations and particle conservation equations. Moreover, the relationship between the peak frequency of each thunder and channel parameters of the lightning is studied. |
| doi_str_mv | 10.1007/s12040-012-0147-0 |
| format | Article |
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Twelve events on 15 August 2008 are selected as samples since some synchronizing information about them are obtained, such as lightning optical spectra, surface E-field changes, etc. By using digital filter and Fourier transform, thunder frequency spectra in observation location have been calculated. Then the two main propagation effects, finite amplitude propagation and attenuation by air, are calculated. Upon that we take the test thunder frequency spectra and work backward to recalculate the original frequency spectra near generation location. Thunder frequency spectra and the frequency distribution varying with distance are researched. According to the theories on plasma, the channel temperature and electron density are further calculated by transition parameters of lines in lightning optical spectra. Pressure and the average ionization degree of each discharge channel are obtained by using Saha equations, charge conservation equations and particle conservation equations. 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| source | Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Indian Academy of Sciences; Springer Nature - Complete Springer Journals |
| subjects | Conservation Conservation equations Digital filters Earth and Environmental Science Earth science Earth Sciences Earth, ocean, space Electron density Equations Exact sciences and technology Fourier transforms Frequency Frequency distribution Frequency spectra Frequency spectrum Ionization Lightning Line spectra Mathematical analysis Parameters Peak frequency Propagation Saha equations Space Exploration and Astronautics Space Sciences (including Extraterrestrial Physics Spectra Synchronism Thunder Thunder frequencies Thunderstorms |
| title | Audible thunder characteristic and the relation between peak frequency and lightning parameters |
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