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Effect of Ionospheric Reflections on the Nature of the Waveforms of Radio Atmospherics
Author(s) -
Bhattacharya H.,
Rao Manoranjan
Publication year - 1966
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/rds196613309
Subject(s) - atmospherics , waveform , ionosphere , ionospheric reflection , reflection (computer programming) , amplitude , lightning (connector) , physics , reflection coefficient , pulse (music) , optics , computational physics , acoustics , mathematics , ionospheric heater , geophysics , meteorology , computer science , detector , power (physics) , quantum mechanics , voltage , programming language
It is well known that ionospheric reflections modify the shape of the waveforms of atmospherics. In this paper an attempt is made to deduce theoretically the shape of the waveform of the pulse radiated by a lightning discharge, after it has undergone successive reflections at the ionospheric layer. To this end, the return‐stroke current due to the lightning discharge is assumed to follow the usual double exponential formula with Kimpara's values of the constants. The ionosphere is taken to be a sharply bounded homogeneous medium and the geometric reflection is assumed to hold. Using Fresnel's reflection coefficient, an expression is obtained for the final shape of the reflected pulse. The plots of this expression for the different orders of reflection show that relative to the amplitude of the positive half of the reflected pulse waveform, the negative half increases in amplitude with the order of reflection. It is observed that there is a decrease in the quasi‐frequency of the reflected pulse waveform with the increase in the order of reflection. Some reflection types of waveforms have actually shown these features.