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Accueil > Séminaires et conférences > Séminaires, soutenances de thèses et HDR précédents > 2016 > Séminaires 2016 > Le vendredi 8 avril 2016 à 11h

Le vendredi 8 avril 2016 à 11h

Vendredi 8/04 à Palaiseau (salle de conf aile 0) à 11h.

Benjamin Grison (Institue of Atmospheric Physics, Univ. Prague)
Titre : Cluster observations of reflected EMIC triggered emission

Abstract :
On 19 March 2001, the Cluster fleet recorded an electromagnetic rising tone on the nightside of the plasmasphere. The emission was found to propagate toward the Earth and toward the magnetic equator with a velocity of about 200 km/s. The Poynting flux is found to be mainly oblique to the background magnetic field and directed toward the Earth. The propagation angle theta becomes more oblique with increasing magnetic latitude. Inside each rising tone, theta is more field-aligned for high frequencies.
Comparing our results to previous ray tracing analysis we conclude that emission is a triggered electromagnetic ion cyclotron (EMIC) wave generated at the nightside plasmapause. We observe the wave right after its reflection in the plasmasphere. The reflection makes the tone slope shallower. This can conribute to the formation of pearl pulsations.


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Tutelles : CNRS Ecole Polytechnique Sorbonne Université Université Paris Sud Observatoire de Paris Convention : CEA
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Mentions légales
Exploitant du site : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Pascal Chabert (Directeur)