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Title: KINETIC TURBULENCE IN THE TERRESTRIAL MAGNETOSHEATH: CLUSTER OBSERVATIONS

We present a first statistical study of subproton- and electron-scale turbulence in the terrestrial magnetosheath using waveform data measured by the Cluster/STAFF search coil magnetometer in the frequency range [1, 180] Hz. It is found that clear spectral breaks exist near the electron scale, which separate two power-law-like frequency bands referred to as the dispersive and the electron dissipation ranges. The frequencies of the breaks f{sub b} are shown to be well correlated with the electron gyroscale ρ {sub e} rather than with the electron inertial length d{sub e} . The distribution of the slopes below f{sub b} is found to be narrow and peaks near –2.9, while that of the slopes above f{sub b} is found to be broader, peaking near –5.2, with values as low as –7.5. This is the first time that such steep power-law spectra are reported in space plasma turbulence. These observations provide new constraints on theoretical modeling of kinetic turbulence and dissipation in collisionless magnetized plasmas.
Authors:
; ;  [1] ;  [2] ;  [3] ; ;  [4] ;  [5]
  1. School of Electronic and Information, Wuhan University, Wuhan (China)
  2. Laboratoire de Physique des Plasmas, CNRS-Ecole Polytechnique-UPMC, F-91128 Palaiseau (France)
  3. School of Earth and Space Sciences, Peking University, Beijing (China)
  4. Institute of Space Science and Technology, Nanchang University, Nanchang (China)
  5. Space Science Institute, School of Astronautics, Beihang University, Beijing (China)
Publication Date:
OSTI Identifier:
22365706
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 789; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DATA ANALYSIS; ELECTRONS; LIMITING VALUES; MAGNETOMETERS; MAGNETOSHEATH; PLASMA; TURBULENCE; WAVE FORMS