Etude expérimentale de l’ionosphère de moyenne et basse latitude et de ses instabilités au moyen d’observations in-situ par DEMETER

Chien-Thang Nguyen 1
1 HEPPI - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : This thesis aims at analyzing two kinds of ionospheric disturbances observed on plasma measurements on-board the DEMETER satellite.The first events are Mid-Scale Traveling Ionospheric Disturbances that develop through the interaction between atmospheric gravity waves and the ionospheric plasma. They are observed as quasi-periodic variations of the plasma density that may reach very large amplitudes and are more frequently observed in the Southern hemisphere with a maximum over the Pacific Ocean. These MSTID may strongly modify the electrodynamics of the mid latitude ionosphere and form structures where the dynamo electric field is significantly enhanced.The second events are detected in the equatorial ionosphere as large scale enhancements of the plasma density under the form of plateau. Depending on the level of magnetic activity these large scale structures may be modified by mid-scale density depletions that, eventually, get instable and led to the formation of depleted plasma bubbles.
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Chien-Thang Nguyen. Etude expérimentale de l’ionosphère de moyenne et basse latitude et de ses instabilités au moyen d’observations in-situ par DEMETER. Océan, Atmosphère. Université de Versailles-Saint Quentin en Yvelines, 2015. Français. ⟨NNT : 2015VERS044V⟩. ⟨tel-01412400⟩

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