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Continuous Recording of Retardation and Intensity of Echoes from the Ionosphere

Verman, LC and Char, ST and Viohammed, A (2006) Continuous Recording of Retardation and Intensity of Echoes from the Ionosphere. In: Proceedings of the Institute of Radio Engineers, 22 (7). 906 -922.

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Pulse retardation method of Breit and Tuve has been modified to record continuously the equivalent height as well as the intensity of reflections from the ionosphere. Synchronized pulses are transmitted, and the received ground pulse and the reflected pulses, after amplification and suitable distortion, are applied to the focusing cylinder of a cathode ray tube the horizontal deflecting plates of which are connected to a synchronized linear time base circuit. The pattern on the screen is composed of a bright straight line corresponding to the time base with dark gaps corresponding to the received pulses. The distance between the initial points of the gaps represents retardation while the widths of the gaps correspond to the intensity of the pulses. The pattern is photographed on a vertically moving film. One of the first few records taken at Bangalore on 4 megacycles is reproduced. It shows, among other things, that the less retarded component of magneto-ionic splitting from the F layer is present most of the time. Whenever the longer retardation component does occur, it has stronger intensity than the former. Towards the late evening hours, just before disappearing, when the F layer rises and exhibits magnetoionic splitting, the intensity of the less retarded component is extremely low compared with the other component.

Item Type: Journal Article
Publication: Proceedings of the Institute of Radio Engineers
Publisher: IEEE
Additional Information: Copyright 1934 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 26 Dec 2011 09:35
Last Modified: 12 Oct 2018 10:47
URI: http://eprints.iisc.ac.in/id/eprint/42899

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