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Titel On the origin of falling-tone chorus elements in Earth's inner magnetosphere
VerfasserIn H. Breuillard, O. Agapitov, A. Artemyev, V. Krasnoselskikh, O. Contel, C. M. Cully, V. Angelopoulos, Y. Zaliznyak, G. Rolland
Medientyp Artikel
Sprache Englisch
ISSN 0992-7689
Digitales Dokument URL
Erschienen In: Annales Geophysicae ; 32, no. 12 ; Nr. 32, no. 12 (2014-12-08), S.1477-1485
Datensatznummer 250121137
Publikation (Nr.) Volltext-Dokument vorhandencopernicus.org/angeo-32-1477-2014.pdf
 
Zusammenfassung
Generation of extremely/very low frequency (ELF/VLF) chorus waves in Earth's inner magnetosphere has received increased attention recently because of their significance for radiation belt dynamics. Though past theoretical and numerical models have demonstrated how rising-tone chorus elements are produced, falling-tone chorus element generation has yet to be explained. Our new model proposes that weak-amplitude falling-tone chorus elements can be generated by magnetospheric reflection of rising-tone elements. Using ray tracing in a realistic plasma model of the inner magnetosphere, we demonstrate that rising-tone elements originating at the magnetic equator propagate to higher latitudes. Upon reflection there, they propagate to lower L-shells and turn into oblique falling tones of reduced power, frequency, and bandwidth relative to their progenitor rising tones. Our results are in good agreement with comprehensive statistical studies of such waves, notably using magnetic field measurements from THEMIS (Time History of Events and Macroscale Interactions during Substorms) spacecraft. Thus, we conclude that the proposed mechanism can be responsible for the generation of weak-amplitude falling-tone chorus emissions.
 
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