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

Journal metrics

Journal metrics

  • IF value: 1.585 IF 1.585
  • IF 5-year value: 1.698 IF 5-year
    1.698
  • CiteScore value: 1.62 CiteScore
    1.62
  • SNIP value: 0.820 SNIP 0.820
  • IPP value: 1.52 IPP 1.52
  • SJR value: 0.781 SJR 0.781
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 83 Scimago H
    index 83
  • h5-index value: 24 h5-index 24
Volume 30, issue 1
Ann. Geophys., 30, 97–107, 2012
https://doi.org/10.5194/angeo-30-97-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 30, 97–107, 2012
https://doi.org/10.5194/angeo-30-97-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

  09 Jan 2012

09 Jan 2012

Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster

S. Y. Huang1,2, M. Zhou2,3, X. H. Deng1,3, Z. G. Yuan1, Y. Pang3, Q. Wei1, W. Su1, H. M. Li1, and Q. Q. Wang1 S. Y. Huang et al.
  • 1School of Electronic Information, Wuhan University, Wuhan 430072, China
  • 2State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, China
  • 3Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China

Abstract. Multiple dipolarization fronts (DFs) were observed by Cluster spacecraft in the magnetotail during a substorm. These DFs were kinetic structures, embedded in the bursty plasma flow, and moved earthward (mainly) and dawnward. Intense electric field, parallel and perpendicular currents were detected in the DF layer. These front layers were energy dissipation region (load region) where the energy of electromagnetic fields were transferred to the plasma thermal and kinetic energy. This dissipation was dominated by electrons. There were enhancements of plasma waves around the DF region: wavelet results show that wave activities around the ion cyclotron frequency in the front layer were generated by Alfvén ion cyclotron instability; whistler waves were also detected before, during and after the DFs, which are triggered by electron temperature anisotropy and coincident with enhancement of energetic electron fluxes. The observation of these waves could be important for the understanding of evolution of DF and electron energization during the substorm. We discuss the generation mechanism of the DFs and suggest that these DFs were generated in the process of transient reconnection, and then traveled toward the Earth.

Publications Copernicus
Download
Citation