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AGU: Geophysical Research Letters

 

Keywords

  • field line resonance
  • ULF waves
  • magnetosphere

Index Terms

  • Magnetospheric Physics: Electric fields
  • Magnetospheric Physics: Magnetosphere: inner
  • Magnetospheric Physics: Plasma waves and instabilities
  • Magnetospheric Physics: Radiation belts
  • Magnetospheric Physics: Instruments and techniques

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L04104, 5 PP., 2009
doi:10.1029/2008GL036732

Characterization of ULF pulsations by THEMIS

T. E. Sarris

Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado, USA

Space Research Laboratory, Demokritus University of Thrace, Xanthi, Greece

W. Liu

Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado, USA

K. Kabin

Department of Physics, University of Alberta, Edmonton, Alberta, Canada

X. Li

Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado, USA

S. R. Elkington

Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado, USA

R. Ergun

Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado, USA

R. Rankin

Department of Physics, University of Alberta, Edmonton, Alberta, Canada

V. Angelopoulos

Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California, USA

J. Bonnell

Space Sciences Laboratory, University of California, Berkeley, California, USA

K. H. Glassmeier

IGEP, Technical University of Braunschweig, Braunschweig, Germany

U. Auster

IGEP, Technical University of Braunschweig, Braunschweig, Germany

The THEMIS five-probe constellation was launched in 17 February 2007 to study substorms; however its instrumentation and the alignment at distances <1RE among some of the THEMIS probes, particularly in the first period of its mission, provides unique opportunities to study ULF pulsations in the magnetosphere. In the case study presented, electric and magnetic field fluctuations are identified as field line resonances and their modes of oscillation are discussed. Phase-difference calculations between probes allow estimates of the mode number of the fluctuations. These observations give an excellent source for the verification of model estimates of frequency and polarization of the various modes of field line resonances.

Received 19 November 2008; accepted 15 January 2009; published 24 February 2009.

Citation: Sarris, T. E., et al. (2009), Characterization of ULF pulsations by THEMIS, Geophys. Res. Lett., 36, L04104, doi:10.1029/2008GL036732.

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