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Journal of Geophysical Research A: Space Physics 115 (2010) A02210
An unusual VLF signature structure recorded by the DEMETER satellite
C. Ferencz 1, J. Lichtenberger 1, D. Hamar 1, Orsolya E. Ferencz 1, P. Steinbach 2, B. Szekely 1, Michel Parrot 3, François Lefeuvre 3, Jean-Jacques Berthelier 4, 5, Mark Clilverd 6

A type of electromagnetic phenomenon has been found in the electric VLF data measured by the low Earth orbit DEMETER satellite, which was nonidentified earlier as a different class of electromagnetic VLF events. The phenomenon, termed as "swallow-tailed whistler" (STW) after its shape, seems to be similar to a whistler, but following the main trace, an additional trace appears with monotonously increasing frequency. The secondary trace, lasting less than 80 ms within the recorded 20 kHz bandwidth joins at a given Starting Furcation Frequency. In a 7 month long time interval three series of strong STWs were found in a geographically confined search zone. Further, 10 weak STW periods have been identified by a thorough review of a 2 month long recording. Several STWs were found by the investigation of randomly selected DEMETER burst VLF recording acquired globally. On the basis of comparisons with previous studies, we can exclude that this phenomenon is generated by plasma processes in the vicinity of the satellite though the formation mechanism of this (ionospheric) signal is so far unclear. It is possible that this event type appeared in earlier records too, however, without identification.
1:  Space Research Group, Eötvös University
Eötvös University
2:  MTA-ELTE Research Group for Geology, Geophysics and Space Sciences
Hungarian Academy of Sciences
3:  Laboratoire de physique et chimie de l'environnement (LPCE)
CNRS : UMR6115 – INSU – Université d'Orléans
4:  Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS)
CNRS : UMR8190 – Université Pierre et Marie Curie (UPMC) - Paris VI – Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) – INSU
5:  Institut Pierre-Simon-Laplace (IPSL)
CNRS : FR636 – Institut de recherche pour le développement [IRD] – CEA – CNES – INSU – Université Pierre et Marie Curie (UPMC) - Paris VI – Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) – École normale supérieure [ENS] - Paris
6:  British Antarctic Survey (BAS)
Natural Environment Research Council
Sciences of the Universe/Ocean, Atmosphere

Sciences of the Universe/Astrophysics/Instrumentation and Methods for Astrophysic

Physics/Astrophysics/Instrumentation and Methods for Astrophysic

Engineering Sciences/Electromagnetism

Physics/Physics/Plasma Physics
VLF – Wistler – Electromagnetism – Space weather