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Title: Comparison of two-fluid and gyrokinetic models for kinetic Alfvén waves in solar and space plasmas

An analytical comparative study of a two-fluid and a gyrokinetic model of kinetic Alfvén waves (KAWs) is presented for various solar and space plasma environments. Based on the linear KAW dispersion relation for gyrokinetics (Howes et al. 2006), the wave group velocity and electromagnetic polarizations are obtained analytically. Then the gyrokinetic wave properties are compared with those of the two-fluid model. The results show that both models agree well with each other not only in the long wavelength regime (>> the ion gyroradius ρ {sub i}) for all cases considered, but also in wavelengths ∼ρ {sub i} and <>1) ion/electron temperature ratio T {sub 0i}/T {sub 0e}, respectively. However, the fluid model calculations deviate strongly from the gyrokinetic model at scales
Authors:
;  [1] ;  [2] ;  [3]
  1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)
  2. Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
  3. Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan (China)
Publication Date:
OSTI Identifier:
22365220
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 792; 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; ALFVEN WAVES; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; DISPERSION RELATIONS; ELECTRON TEMPERATURE; ELECTRONS; FLUIDS; IONS; OSCILLATIONS; PLASMA; POLARIZATION; SPACE; WAVELENGTHS