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Accueil > Séminaires et conférences > Séminaires, soutenances de thèses et HDR précédents > 2015 > Séminaires 2015 > Le mercredi 25 mars à 11h

Le mercredi 25 mars à 11h

Pierre Henri - LPC2E, Orleans

A Walk Around Comet 67P/Churyumov-Gerasimenko With the Rosetta Plasma Consortium

Lieu : Jussieu

Résumé :
After more than ten years in space, the ESA spacecraft Rosetta has reached its target comet 67P/Churyumov-Gerasimenko in the summer 2014. Onboard the orbiter, the Rosetta Plasma Consortium (RPC) instrument package is designed to study : (i) the microscopic and macroscopic structure of the interaction region of the comet with the solar wind, (ii) the evolution of the cometary activity and (iii) the inner comet’s structure, dynamics and aeronomy, and iv) the physical properties of the cometary nucleus and surface.
During Rosetta’s approach and during the first months in the close vicinity of the comet, the RPC instruments nearly continuously monitored the comet environment and its interaction with the solar wind. While the comet is still in a state of relatively low-activity, the five RPC plasma sensors detected signals related to the comet-driven modifications of the solar wind : the first signs of cometary activity with the detection of cometary ions by the Ion Composition Analyser (RPC-ICA) and the Ion and Electron Sensor (RPC-IES), as well as an increasing of electron fluxes. Magnetic fluctuations and low frequency waves resulting from Comet-Solar Wind interaction, detected by the Fluxgate Magnetometer (RPC-MAG), electron density enhancements, resulting from the ionisation of cometary gas detected by the Langmuir probes (RPC-LAP) and by the Mutual Impedance Probe (RPC-MIP). We show first observations obtained during the cometary approach phase and the early phase of the comet activity, discussed in context of model predictions.

Tutelles : CNRS Ecole Polytechnique Sorbonne Université Université Paris Sud Observatoire de Paris Convention : CEA
©2009-2019 Laboratoire de Physique des Plasmas (LPP)

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)