Scattering of ELF waves by underground formations because of night-day ionospheric ridge

Valagiannopoulos, CA; Uzunoglu, NK

dc.contributor.author	Valagiannopoulos, CA	en
dc.contributor.author	Uzunoglu, NK	en
dc.date.accessioned	2014-03-01T01:27:12Z
dc.date.available	2014-03-01T01:27:12Z
dc.date.issued	2007	en
dc.identifier.issn	0048-6604	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18341
dc.subject	Ionosphere	en
dc.subject.classification	Geochemistry & Geophysics	en
dc.subject.classification	Instruments & Instrumentation	en
dc.subject.classification	Meteorology & Atmospheric Sciences	en
dc.subject.classification	Remote Sensing	en
dc.subject.classification	Telecommunications	en
dc.subject.other	Earth surface	en
dc.subject.other	Electromagnetic imaging	en
dc.subject.other	Extremely low frequencies	en
dc.subject.other	Green's function methods	en
dc.subject.other	Ionospheric heights	en
dc.subject.other	Mathematical principle	en
dc.subject.other	Method of auxiliary sources	en
dc.subject.other	Mode matching technique	en
dc.subject.other	Numerical results	en
dc.subject.other	Point sources	en
dc.subject.other	Electric furnaces	en
dc.subject.other	Optoelectronic devices	en
dc.subject.other	Scattering	en
dc.subject.other	Green's function	en
dc.title	Scattering of ELF waves by underground formations because of night-day ionospheric ridge	en
heal.type	journalArticle	en
heal.identifier.primary	10.1029/2007RS003682	en
heal.identifier.secondary	http://dx.doi.org/10.1029/2007RS003682	en
heal.identifier.secondary	RS6S32	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	In the present work the variation in ionospheric height observed during the dawn or dusk hours is used to develop an electromagnetic imaging system for extremely low frequencies (ELF). The description concerns the mathematical principles of the proposed method rather than a realistic implementation of the technique. The scattering of ELF waves emanating from a point source on the Earth surface by a cylindrical underground formation is studied analytically with use of a Green's function method. The ionospheric discontinuity is treated with the help of mode matching technique and the subterranean scatterer by application of the method of auxiliary sources. Numerical results are presented and discussed for several cases. Copyright 2008 by the American Geophysical Union.	en
heal.publisher	AMER GEOPHYSICAL UNION	en
heal.journalName	Radio Science	en
dc.identifier.doi	10.1029/2007RS003682	en
dc.identifier.isi	ISI:000251349700002	en
dc.identifier.volume	42	en
dc.identifier.issue	6	en