Annales Geophysicae (Sep 2011)

Ducted propagation of chorus waves: Cluster observations

  • K. H. Yearby,
  • M. A. Balikhin,
  • Yu. V. Khotyaintsev,
  • S. N. Walker,
  • V. V. Krasnoselskikh,
  • H. St. C. K. Alleyne,
  • O. Agapitov

DOI
https://doi.org/10.5194/angeo-29-1629-2011
Journal volume & issue
Vol. 29
pp. 1629 – 1634

Abstract

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Ducted propagation of whistler waves in the terrestrial magnetosphere-ionosphere system was discussed and studied long before the first in-situ spacecraft measurements. While a number of implicit examples of the existence of ducted propagation have been found, direct observation of ducts has been hampered by the low sampling rates of measurements of the plasma density. The present paper is based on Cluster observations of chorus waves. The ability to use measurements of the spacecraft potential as a proxy for high time resolution electron density measurements is exploited to identify a number of cases when increased chorus wave power, observed within the radiation belts, is observed simultaneously with density enchantments. It is argued that the observation of ducted propagation of chorus implies modification of numerical models for plasma-wave interactions within the radiation belts.