Estimating the Lower Ionosphere Height and Lightning Location Using Multimode "Tweek" Atmospherics
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Date
2014
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
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 .
Description
Т. Serdiuk: ORCID 0000-0002-2609-4071
Keywords
earth ionosphere waveguide, frequency dispersion, ionospheric heights, lightning location, lower ionosphere, preliminary analysis, propagation distances, tweek-atmospherics, atmospherics, cutoff frequency, estimation, inverse problems, ionospheric measurement, lightning, waveguides, ionosphere, іоносферний хвилевід, частотна дисперсія, іоносферні висоти, розташування блискавки, нижня іоносфера, попередній аналіз, відстань розповсюдження, твік-атмосферики, атмосферики, частота зрізу, оцінка, зворотня задача, іоносферне вимірювання, блискавка, хвилеводи, іоносфера, ионосферный волновод, частотная дисперсия, ионосферные высоты, расположение молнии, нижняя ионосфера, предварительный анализ, расстояние распространения, твик-атмосферики, атмосферики, частота среза, оценка, обратная задача, ионосферное измерение, молния, волноводы, ионосфера, Scopus, скопус
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.