Ion sound wave packets at the quasiperpendicular shock front

M. Balikhin, Simon Walker, Rat Treumann, H. Alleyne, V. Krasnoselskikh, M. Gedalin, Mats Andre, M. W. Dunlop, A. Fazakerley

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Electric field measurements from a single spacecraft have been used to study ion-sound turbulence observed within the Earth's bow shock. The observed frequency of the ion-sound waves can be both lower and higher than the local electron cyclotron frequency depending upon the direction of wave propagation in the plasma rest frame. The ion-sound waves observed upstream of the ramp can not be generated either by an instability related to the gradient in the electron temperature or an electric current within the ramp. A comparison of wave vectors for distinctive wave packets indicate that non-stationary, short scale current layers formed in the processes of the ramp evolution might be the source of the free energy for such waves.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Issue number24
StatePublished - 28 Dec 2005

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences (all)


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