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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 5
Ann. Geophys., 25, 1103-1112, 2007
https://doi.org/10.5194/angeo-25-1103-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 1103-1112, 2007
https://doi.org/10.5194/angeo-25-1103-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  04 Jun 2007

04 Jun 2007

The effect of subionospheric propagation on whistlers recorded by the DEMETER satellite – observation and modelling

O. E. Ferencz1, Cs. Ferencz1, P. Steinbach2, J. Lichtenberger1, D. Hamar1, M. Parrot3, F. Lefeuvre3, and J.-J. Berthelier4 O. E. Ferencz et al.
  • 1Space Research Group, Eötvös University, (Inst. of Geogr. and Earth Sci.), 1117 Budapest, Pázmány P.s. 1/A, Hungary
  • 2MTA-ELTE Research Group for Geology, Geophysics and Space Sciences, 1117 Budapest, Pázmány P.s. 1/A, Hungary
  • 3LPCE/CNRS 3A Avenue de la Recherche, 45071, Orléans, Cedex 2, France
  • 4CETP/IPSL, Observatoire de Saint Maur, 4, Avenue de Neptune, Saint Maur des Fossés, 94107, France

Abstract. 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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