Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.490 IF 1.490
  • IF 5-year value: 1.445 IF 5-year
    1.445
  • CiteScore value: 2.9 CiteScore
    2.9
  • SNIP value: 0.789 SNIP 0.789
  • IPP value: 1.48 IPP 1.48
  • SJR value: 0.74 SJR 0.74
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 88 Scimago H
    index 88
  • h5-index value: 21 h5-index 21
Volume 24, issue 3
Ann. Geophys., 24, 1057–1075, 2006
https://doi.org/10.5194/angeo-24-1057-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 1057–1075, 2006
https://doi.org/10.5194/angeo-24-1057-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  19 May 2006

19 May 2006

Origin of the turbulent spectra in the high-altitude cusp: Cluster spacecraft observations

K. Nykyri1, B. Grison2, P. J. Cargill1, B. Lavraud3, E. Lucek1, I. Dandouras4, A. Balogh1, N. Cornilleau-Wehrlin2, and H. Rème4 K. Nykyri et al.
  • 1The Blackett Laboratory, Imperial College, London, UK
  • 2CETP/CNRS-UVSQ, 10/12 Avenue de l Europe, 78140, Velizy, France
  • 3Los Alamos National Laboratory, Los Alamos, NM, USA
  • 4Centre d’Etude Spatiale des Rayonnements,31028 Toulouse Cedex 4, France

Abstract. High-resolution magnetic field data from Cluster Flux Gate Magnetometer (FGM) and the Spatio-Temporal Analysis of Field Fluctuations (STAFF) instruments are used to study turbulent magnetic field fluctuations during the high-altitude cusp crossing on 17 March 2001. Despite the quiet solar wind conditions, the cusp was filled with magnetic field turbulence whose power correlates with the field-aligned ion plasma flux. The magnetic field wave spectra shows power law behavior with both double and single slopes with break in the spectra usually occurring in the vicinity of the local ion cyclotron frequency. Strong peaks in the wave power close to local ion cyclotron frequency were sometimes observed, with secondary peaks at higher harmonics indicative of resonant processes between protons and the waves. We show that the observed spectral break point may be caused partly by damping of obliquely propagating kinetic Alfvén (KAW) waves and partly by cyclotron damping of ion cyclotron waves.

Publications Copernicus
Download
Citation