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| Titel |
The effect of subionospheric propagation on whistlers recorded by the DEMETER satellite – observation and modelling |
| VerfasserIn |
O. E. Ferencz, Cs. Ferencz, P. Steinbach, J. Lichtenberger, D. Hamar, M. Parrot, F. Lefeuvre, J.-J. Berthelier |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 25, no. 5 ; Nr. 25, no. 5 (2007-06-04), S.1103-1112 |
| Datensatznummer |
250015842
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| Publikation (Nr.) |
 copernicus.org/angeo-25-1103-2007.pdf |
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| Zusammenfassung |
| During a routine analysis of whistlers on the wide-band VLF recording of the
DEMETER satellite, a specific signal structure of numerous fractional-hop
whistlers, termed the "Spiky Whistler" (SpW) was identified. These signals
appear to be composed of a conventional whistler combined by the compound
mode-patterns of guided wave propagation, suggesting a whistler excited by a
lightning "tweek" spheric. Rigorous, full-wave modelling of tweeks, formed
by the long subionospheric guided spheric propagation and of the impulse
propagation across an arbitrarily inhomogeneous ionosphere, gave an accurate
description of the SpW signals. The electromagnetic impulses excited by
vertical, preferably CG lightning discharge, exhibited the effects of guided
behaviour and of the dispersive ionospheric plasma along their paths. This
modelling and interpretation provides a consistent way to determine the
generation and propagation characteristics of the recorded SpW signals, as
well as to describe the traversed medium. |
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