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Observational evidence of the generation mechanism for rising-tone chorus
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2011 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 38, no 1, L01106- p.Article in journal (Refereed) Published
Abstract [en]

Chorus emissions are a striking feature of the electromagnetic wave environment in the Earth's magnetosphere. These bursts of whistler-mode waves exhibit characteristic frequency sweeps (chirps) believed to result from wave-particle trapping of cyclotron-resonant particles. Based on the theory of Omura et al. (2008), we predict the sweep rates of chorus elements observed by the THEMIS satellites. The predictions use independent observations of the electron distribution functions and have no free parameters. The predicted chirp rates are a function of wave amplitude, and this relation is clearly observed. The predictive success of the theory lends strong support to its underlying physical mechanism: cyclotron-resonant wave-particle trapping.

Place, publisher, year, edition, pages
2011. Vol. 38, no 1, L01106- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-146882DOI: 10.1029/2010GL045793ISI: 000286323500006OAI: oai:DiVA.org:uu-146882DiVA: diva2:399276
Available from: 2011-02-21 Created: 2011-02-21 Last updated: 2011-02-21Bibliographically approved

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