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Nonlinear decay of foreshock Langmuir waves in the presence of plasma inhomogeneities: Theory and Cluster observations
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SYSNO ASEP 0306673 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Nonlinear decay of foreshock Langmuir waves in the presence of plasma inhomogeneities: Theory and Cluster observations Title Nelineární rozpad Langmuirových vln ve slunečním větru před rázovou vlnou za přítomnosti nehomogenit plasmatu: teorie a měření družicemi Cluster Author(s) Souček, Jan (UFA-U) RID, ORCID
Krasnoselskikh, V. (FR)
Dudok de Wit, T. (FR)
Pickett, J. (US)
Kletzing, C. (US)Source Title Journal of Geophysical Research - ISSN 0148-0227
Roč. 110, A8 (2005), A08102/1-A08102/10Number of pages 10 s. Language eng - English Country US - United States Keywords plasma waves ; kinetic waves and instabilities ; foreshock ; solar wind Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects ME 650 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA202/03/0832 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) DOI https://doi.org/10.1029/2004JA010977 Annotation The intense high frequency electrostatic waves observed in the terrestrial foreshock often have a form of a superposition of two monochromatic waves close to the plasma frequency. We suggest an interpretation of these spectra as signatures of nonlinear decay of Langmuir waves to electron-sound and ion-sound secondary waves. This decay instability is known to have different properties in inhomogeneous plasma, namely the threshold amplitude of this instability is inversely proportional to the scale of the inhomogeneity. We show that the observed dependence of the wave amplitude on the modulation scale of the wave-packets is consistent with this property and the theory of absolute decay instability in inhomogeneous plasma can be applied to explain the satellite observations. In this study we used electric field data from the WBD instrument on-board CLUSTER satellites. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2008
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