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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 31, issue 8 | Copyright

Special issue: Dynamical processes in space plasmas II

Ann. Geophys., 31, 1437-1446, 2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 26 Aug 2013

Regular paper | 26 Aug 2013

Dispersion relation of electromagnetic ion cyclotron waves using Cluster observations

I. P. Pakhotin1, S. N. Walker1, Y. Y. Shprits2,3,4, and M. A. Balikhin1 I. P. Pakhotin et al.
  • 1Department of Automatic Control and Systems Engineering, University of Sheffield, Sheffield, South Yorkshire, UK
  • 2Department of Earth and Space Sciences, UCLA, Los Angeles, CA, USA
  • 3Department of Atmospheric and Planetary Sciences, MIT, Cambridge, MA, USA
  • 4Skolkovo Institute of Science and Technology, Moscow, Russian Federation

Abstract. Multi-point wave observations on Cluster spacecraft are used to infer the dispersion relation of electromagnetic ion cyclotron (EMIC) waves. In this study we use a phase differencing method and observations from STAFF and WHISPER during a well-studied event of 30 March 2002. The phase differencing method requires the knowledge of the direction of the wave vector, which was obtained using minimum variance analysis. Wave vector amplitudes were calculated for a number of frequencies to infer the dispersion relation experimentally. The obtained dispersion relation is largely consistent with the cold plasma dispersion relation. The presented method allows inferring the dispersion relation experimentally. It can be also used in the future to analyse the hot plasma dispersion relation of waves near the local gyrofrequency that can occur under high plasma beta conditions.

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