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Title: TEMPERATURE ANISOTROPY IN THE PRESENCE OF ULTRA LOW FREQUENCY WAVES IN THE TERRESTRIAL FORESHOCK

We report the first study of the correlation between elevated solar wind core plasma temperatures and temperature anisotropy in the terrestrial foreshock. Plasma temperature is enhanced near the fire hose marginal stability threshold in the presence of ultra low frequency (ULF) large amplitude magnetic perturbations, which are intrinsically right-hand circularly polarized. Direct comparison of contemporaneous anisotropic temperatures in the upstream solar wind and the foreshock suggests that the net heating of plasma is mediated via increase of the parallel temperature in the foreshock region where the ULF waves are present. We consider the possibility that a mechanism based on Landau damping, where solar wind plasma temperature parallel to the background magnetic field is increased by interaction with oblique compressible fast magneto-acoustic ULF waves, influences temperature anisotropy.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL (United Kingdom)
  2. Space and Atmospheric Physics, The Blackett Laboratory, Imperial College London, London (United Kingdom)
  3. School of Physics and Astronomy, Queen Mary University of London (United Kingdom)
Publication Date:
OSTI Identifier:
22365806
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 788; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; ANISOTROPY; COMPARATIVE EVALUATIONS; CORRELATIONS; DISTURBANCES; ELECTRON TEMPERATURE; FORESHOCKS; ION TEMPERATURE; LANDAU DAMPING; MAGNETIC FIELDS; OSCILLATIONS; PLASMA; POLARIZATION; SOLAR WIND; SUN