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Title: Estimating the Lower Ionosphere Height and Lightning Location Using Multimode "Tweek" Atmospherics
Authors: Shvets, Аleksandr V.
Швець, Олександр Володимирович
Швец, Александр Владимирович
Serdiuk, Tetiana M.
Serdyuk, Tatyana N.
Сердюк, Тетяна Миколаївна
Сердюк, Татьяна Николаевна
Gorishnyaya, Y. V.
Горишняя, Ю. В.
Hobara, Y.
Hayakawa, M.
Keywords: earth ionosphere waveguide
frequency dispersion
ionospheric heights
lightning location
lower ionosphere
preliminary analysis
propagation distances
cutoff frequency
inverse problems
ionospheric measurement
іоносферний хвилевід
частотна дисперсія
іоносферні висоти
розташування блискавки
нижня іоносфера
попередній аналіз
відстань розповсюдження
частота зрізу
зворотня задача
іоносферне вимірювання
ионосферный волновод
частотная дисперсия
ионосферные высоты
расположение молнии
нижняя ионосфера
предварительный анализ
расстояние распространения
частота среза
обратная задача
ионосферное измерение
Issue Date: 2014
Publisher: Elsevier
Citation: Estimating the Lower Ionosphere Height and Lightning Location using Multimode "Tweek" Atmospherics / A. V. Shvets, T. M. Serdiuk, Y. V. Gorishnyaya, Y. Hobara, M. Hayakawa // Journal of Atmospheric and Solar-Terrestrial Physics. — 2014. — Vol. 108. — p. 1—9. Використані метадані з\%26quot%3BDnipropetrovsk+National+University+of+Railway+Transport+named+after+Academician+V.+Lazaryan\%26quot%3B+60017228%29%29
Abstract: EN: There is proposed a new method of estimating the effective ionospheric height of the Earth-ionosphere waveguide and the propagation distance of tweek-atmospherics. It is based on the compensation of waveguide frequency dispersion of a tweek signal, which enables us to improve the accuracy of deducing the cutoff frequencies, especially in the presence of noise. An approach to solve the inverse problem is suggested that reduces the task of finding both the source range and the waveguide cutoff frequencies by using the multimode characteristics of tweeks to an issue of one-dimensional optimization. Based on the numerical modeling of multimode tweek-atmospherics in the Earth-ionosphere waveguide with exponential vertical conductivity profile of the lower ionosphere, it was shown that the accuracy of estimating the effective waveguide height by the new method is good as about 100-400. m for the first and higher order modes. It then allows us to estimate the parameters of vertical conductivity profile of the lower ionosphere for a wide range of source distances from a few hundred to a few thousand kilometers, as long as two or more tweek harmonics can be detected. Preliminary analysis of experimental tweek records show a decrease of the effective height with increasing the mode number, and the scale height of the exponential vertical conductivity profile for the isotropic lower ionosphere model is estimated to be in a range of 0.4-2.5. km. © 2013 .
ISSN: 13646826
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