[La mission DEMETER, investigations récentes sur dʼeffets ionosphériques associés à lʼactivité de lʼhomme, et à lʼactivité sismique]
Deux des principaux objectifs scientifiques de la mission DEMETER, concernaient la recherche dʼeffets ionosphériques associés à lʼactivité sismique et lʼétude des perturbations engendrées par lʼactivité humaine ou les phénomènes naturels tels les orages. Les données acquises depuis presque 6 ans en orbite ont fourni matière à des observations inédites et/ou à des progrès substantiels dans la compréhension de phénomènes déjà connus. Après une brève description de la charge utile et des modes de fonctionnement, nous donnons un aperçu de quelques résultats récents des travaux entrepris dans ces deux domaines. Les effets de lʼactivité humaine intéressent essentiellement les émissions radio-électriques et nous présentons plusieurs résultats concernant les émissions engendrées par les réseaux électriques et les perturbations de lʼionosphère par les émetteurs VLF de forte puissance. En ce qui concerne les perturbations dʼorigine sismique, nous présentons les études statistiques réalisées pour caractériser les ondes naturelles et permettre de distinguer dʼéventuels effets sismiques. Lʼune dʼentre elles a permis de mettre en évidence une diminution de lʼintensité des ondes naturelles dans le domaine ELF, entre 1 et 2 kHz, quelques heures avant les séismes.
Two of the main scientific objectives of the DEMETER mission concerned the search for ionospheric effects due to earthquakes and the study of disturbances associated with human activities or natural phenomena such as thunderstorms. The large data base gathered during nearly 6 years of in-orbit operation has lead to making new observations and/or to improving the understanding of several, already identified, phenomena. The main effects of human activities are observed in the field of radio-electric emissions and we present several results on the EM waves generated by power networks or associated with high power VLF transmitters. The search for ionospheric disturbances associated with earthquakes relies on thorough statistical studies to disentangle seismic effects from the variations induced by the physical processes that control the ionospheric plasma and natural emissions. Several studies are presented, and one of them has demonstrated a decrease of the ELF wave intensity in the frequency range between 1 and 2 kHz a few hours before the shock.
Mot clés : Ionosphère, Activité sismique, Onde naturelle et émissions artificielles
@article{CRPHYS_2011__12_2_160_0,
author = {Tatsuo Onishi and Michel Parrot and Jean-Jacques Berthelier},
title = {The {DEMETER} mission, recent investigations on ionospheric effects associated with man-made activities and seismic phenomena},
journal = {Comptes Rendus. Physique},
pages = {160--170},
publisher = {Elsevier},
volume = {12},
number = {2},
year = {2011},
doi = {10.1016/j.crhy.2010.11.009},
language = {en},
}
TY - JOUR AU - Tatsuo Onishi AU - Michel Parrot AU - Jean-Jacques Berthelier TI - The DEMETER mission, recent investigations on ionospheric effects associated with man-made activities and seismic phenomena JO - Comptes Rendus. Physique PY - 2011 SP - 160 EP - 170 VL - 12 IS - 2 PB - Elsevier DO - 10.1016/j.crhy.2010.11.009 LA - en ID - CRPHYS_2011__12_2_160_0 ER -
%0 Journal Article %A Tatsuo Onishi %A Michel Parrot %A Jean-Jacques Berthelier %T The DEMETER mission, recent investigations on ionospheric effects associated with man-made activities and seismic phenomena %J Comptes Rendus. Physique %D 2011 %P 160-170 %V 12 %N 2 %I Elsevier %R 10.1016/j.crhy.2010.11.009 %G en %F CRPHYS_2011__12_2_160_0
Tatsuo Onishi; Michel Parrot; Jean-Jacques Berthelier. The DEMETER mission, recent investigations on ionospheric effects associated with man-made activities and seismic phenomena. Comptes Rendus. Physique, Volume 12 (2011) no. 2, pp. 160-170. doi : 10.1016/j.crhy.2010.11.009. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2010.11.009/
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Commentaires - Politique
DEMETER observations of manmade waves that propagate in the ionosphere
Michel Parrot
C. R. Phys (2018)