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AGU: Geophysical Research Letters

 

Keywords

  • chorus waves
  • global distribution
  • occurrence rate

Index Terms

  • Radio Science: Waves in plasma
  • Space Plasma Physics: Wave/particle interactions
  • Magnetospheric Physics: Plasma waves and instabilities
  • Magnetospheric Physics: Radiation belts

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L09104, 5 PP., 2009
doi:10.1029/2009GL037595

Global distribution of whistler-mode chorus waves observed on the THEMIS spacecraft

W. Li

Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA

R. M. Thorne

Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA

V. Angelopoulos

IGPP, University of California, Los Angeles, California, USA

J. Bortnik

Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA

C. M. Cully

Swedish Institute of Space Physics, Uppsala, Sweden

B. Ni

Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA

O. LeContel

Centre d'étude des Environnements Terrestre et Planétaires, Vélizy, France

A. Roux

Centre d'étude des Environnements Terrestre et Planétaires, Vélizy, France

U. Auster

Institut für Geophysik und extraterrestrische Physik, Technischen Universität Braunschweig, Braunschweig, Germany

W. Magnes

Space Research Institute, Austrian Academy of Sciences, Graz, Austria

Whistler mode chorus waves are receiving increased scientific attention due to their important roles in both acceleration and loss processes of radiation belt electrons. A new global survey of whistler-mode chorus waves is performed using magnetic field filter bank data from the THEMIS spacecraft with 5 probes in near-equatorial orbits. Our results confirm earlier analyses of the strong dependence of wave amplitudes on geomagnetic activity, confinement of nightside emissions to low magnetic latitudes, and extension of dayside emissions to high latitudes. An important new finding is the strong occurrence rate of chorus on the dayside at L > 7, where moderate dayside chorus is present >10% of the time and can persist even during periods of low geomagnetic activity.

Received 3 February 2009; accepted 23 March 2009; published 7 May 2009.

Citation: Li, W., R. M. Thorne, V. Angelopoulos, J. Bortnik, C. M. Cully, B. Ni, O. LeContel, A. Roux, U. Auster, and W. Magnes (2009), Global distribution of whistler-mode chorus waves observed on the THEMIS spacecraft, Geophys. Res. Lett., 36, L09104, doi:10.1029/2009GL037595.

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