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Accueil > Séminaires et conférences > Séminaires, soutenances de thèses et HDR précédents > 2011 > Séminaires 2011 > Le jeudi 19 octobre 2011 à 14h

Le jeudi 19 octobre 2011 à 14h

Prof. Joran Moen, Department of Physics, University of Oslo, Norway (jmoen fys.uio.no) :
Current and future perspectives of cusp polar cap ionosphere studies

Lieu : Ecole Polytechnique - Palaiseau (salle de réunion du LMS)

Abstract :

The ICI-series of rockets - Investigation of Cusp Irregularities - is intended to study plasma waves, instabilities, and electron plasma irregularities of the cusp auroral ionosphere and of polar cap patches. The mission objectives range from basic research to applied physics. The basic research objectives are to test the various instability modes for echoing HF-backscatter targets in the F-region ionosphere that have been proposed in the literature, but requires high resolution measurements to test. It is well known that ionospheric plasma density irregularities at scales from hundred of meters to a few kilometres affects GHz frequencies used for satellite communication and navigation systems, and the ICI-research may help to advance ionospheric space weather forecasts.
Examples of spin-offs from the sounding rocket activity will also be presented. We have invented a new low weight Langmuir probe system consisting of multiple needle probes suitable for cubesat missions. The standard configuration comprises a 4-Needle Langmuir Probe (4-NLP) system. The geniality about the system is that is can measure absolute electron densities at sampling rates of up to 10 kHz, independent of the electron temperature and the platform potential. This system will fly on the the CubeSTAR student satellite currently under development, of which our vision is to demonstrate a new concept space weather satellite. In the future (ICI-5) we plan to use cubesat format platforms as daughter payloads in our rocket program to obtain multi-point measurement in the ionosphere for kinetics scale plasma physics.


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