ULF waves: Conjugated ground-satellite relationships |
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Authors: | Roger Gendrin Sylvaine Perraut Hervé Fargetton François Glangeaud Jean-Louis Lacoume |
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Institution: | (1) Départment Etudes par Télédétection de l'Environment, Centre National d'Etudes des Télécommunications, 92131 Issy-les-Moulineaux, France;(2) Centre d'Etudes des Phénomènes Aléatoires et Géophysiques, Institut National Polytechnique, 38400 Saint-Martin-d'Hères, France |
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Abstract: | We study the simultaneous occurrence of ULF waves observed on board GEOS and at two of its conjugated stations: Husafell (Iceland) and Skibotn (Norway). We try to deduce some properties of the regions in which these waves are generated. The few number of simultaneous observations of pearl events indicates that such structured oscillations can occur only in specific conditions which are not met generally at the geostationary altitude. We introduce a new method for measuring time delays between the satellite and the ground. We show that this time is much higher than it would be expected from a simple extrapolation of measurements done at lower latitudes on structured events. |
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